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Title: Fermi -LAT Observations of $γ$-Ray Emission toward the Outer Halo of M31

Abstract

The Andromeda galaxy is the closest spiral galaxy to us and has been the subject of numerous studies. It harbors a massive dark matter halo, which may span up to ~600 kpc across and comprises ~90% of the galaxy's total mass. This halo size translates into a large diameter of 42° on the sky, for an M31–Milky Way (MW) distance of 785 kpc, but its presumably low surface brightness makes it challenging to detect with $γ$-ray telescopes. Using 7.6 years of Fermi Large Area Telescope ( Fermi–LAT) observations, we make a detailed study of the $γ$-ray emission between 1–100 GeV toward M31's outer halo, with a total field radius of 60° centered at M31, and perform an in-depth analysis of the systematic uncertainties related to the observations. We use the cosmic-ray propagation code GALPROP to construct specialized interstellar emission models to characterize the foreground $γ$-ray emission from the MW, including a self-consistent determination of the isotropic component. We find evidence for an extended excess that appears to be distinct from the conventional MW foreground, having a total radial extension upward of ~120–200 kpc from the center of M31. We discuss plausible interpretations of the excess emission, but emphasize that uncertaintiesmore » in the MW foreground—and in particular, modeling of the H I-related components—have not been fully explored and may impact the results.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Stanford Univ., CA (United States). Hansen Experimental Physics Lab. and Kavli Inst. for Particle Astrophysics and Cosmology
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1560649
Grant/Contract Number:  
AC02-76SF00515; DESC0014431; PHY-1620638; NNX17AB48G
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 880; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Karwin, Christopher M., Murgia, Simona, Campbell, Sheldon, and Moskalenko, Igor V. Fermi -LAT Observations of $γ$-Ray Emission toward the Outer Halo of M31. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab2880.
Karwin, Christopher M., Murgia, Simona, Campbell, Sheldon, & Moskalenko, Igor V. Fermi -LAT Observations of $γ$-Ray Emission toward the Outer Halo of M31. United States. doi:10.3847/1538-4357/ab2880.
Karwin, Christopher M., Murgia, Simona, Campbell, Sheldon, and Moskalenko, Igor V. Tue . "Fermi -LAT Observations of $γ$-Ray Emission toward the Outer Halo of M31". United States. doi:10.3847/1538-4357/ab2880.
@article{osti_1560649,
title = {Fermi -LAT Observations of $γ$-Ray Emission toward the Outer Halo of M31},
author = {Karwin, Christopher M. and Murgia, Simona and Campbell, Sheldon and Moskalenko, Igor V.},
abstractNote = {The Andromeda galaxy is the closest spiral galaxy to us and has been the subject of numerous studies. It harbors a massive dark matter halo, which may span up to ~600 kpc across and comprises ~90% of the galaxy's total mass. This halo size translates into a large diameter of 42° on the sky, for an M31–Milky Way (MW) distance of 785 kpc, but its presumably low surface brightness makes it challenging to detect with $γ$-ray telescopes. Using 7.6 years of Fermi Large Area Telescope (Fermi–LAT) observations, we make a detailed study of the $γ$-ray emission between 1–100 GeV toward M31's outer halo, with a total field radius of 60° centered at M31, and perform an in-depth analysis of the systematic uncertainties related to the observations. We use the cosmic-ray propagation code GALPROP to construct specialized interstellar emission models to characterize the foreground $γ$-ray emission from the MW, including a self-consistent determination of the isotropic component. We find evidence for an extended excess that appears to be distinct from the conventional MW foreground, having a total radial extension upward of ~120–200 kpc from the center of M31. We discuss plausible interpretations of the excess emission, but emphasize that uncertainties in the MW foreground—and in particular, modeling of the H I-related components—have not been fully explored and may impact the results.},
doi = {10.3847/1538-4357/ab2880},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 880,
place = {United States},
year = {2019},
month = {7}
}

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Works referenced in this record:

Probing the Nature of the G1 Clump Stellar Overdensity in the Outskirts of M31
journal, February 2007

  • Faria, Daniel; Johnson, Rachel A.; Ferguson, Annette M. N.
  • The Astronomical Journal, Vol. 133, Issue 4
  • DOI: 10.1086/511156

Not so lumpy after all: modelling the depletion of dark matter subhaloes by Milky Way-like galaxies 
journal, July 2017

  • Garrison-Kimmel, Shea; Wetzel, Andrew; Bullock, James S.
  • Monthly Notices of the Royal Astronomical Society, Vol. 471, Issue 2
  • DOI: 10.1093/mnras/stx1710

The Three-Dimensional Structure of the m31 Satellite System; Strong Evidence for an Inhomogeneous Distribution of Satellites
journal, March 2013


The tail of M33 and the adjacent hydrogen cloud
journal, October 1979

  • Wright, M. C. H.
  • The Astrophysical Journal, Vol. 233
  • DOI: 10.1086/157363

Dwarf galaxy planes: the discovery of symmetric structures in the Local Group
journal, September 2013

  • Pawlowski, Marcel S.; Kroupa, Pavel; Jerjen, Helmut
  • Monthly Notices of the Royal Astronomical Society, Vol. 435, Issue 3
  • DOI: 10.1093/mnras/stt1384

Substructure and galaxy formation in the Copernicus Complexio warm dark matter simulations
journal, October 2016

  • Bose, Sownak; Hellwing, Wojciech A.; Frenk, Carlos S.
  • Monthly Notices of the Royal Astronomical Society, Vol. 464, Issue 4
  • DOI: 10.1093/mnras/stw2686

Dissipation of Magnetohydrodynamic Waves on Energetic Particles: Impact on Interstellar Turbulence and Cosmic‐Ray Transport
journal, May 2006

  • Ptuskin, Vladimir S.; Moskalenko, Igor V.; Jones, Frank C.
  • The Astrophysical Journal, Vol. 642, Issue 2
  • DOI: 10.1086/501117

A revised Λ CDM mass model for the Andromeda Galaxy: A revised mass model for M31
journal, September 2008

  • Seigar, Marc S.; Barth, Aaron J.; Bullock, James S.
  • Monthly Notices of the Royal Astronomical Society, Vol. 389, Issue 4
  • DOI: 10.1111/j.1365-2966.2008.13732.x

A vast, thin plane of corotating dwarf galaxies orbiting the Andromeda galaxy
journal, January 2013

  • Ibata, Rodrigo A.; Lewis, Geraint F.; Conn, Anthony R.
  • Nature, Vol. 493, Issue 7430
  • DOI: 10.1038/nature11717

Dark matter annihilation in the Galactic Center as seen by the Fermi Gamma Ray Space Telescope
journal, March 2011


Search for Dark Matter Annihilation in Galaxy Groups
journal, March 2018


The WSRT wide-field H I survey: II. Local Group features
journal, March 2004


2MASS NIR photometry for 693 candidate globular clusters in M 31 and the Revised Bologna Catalogue
journal, March 2004


A precision search for WIMPs with charged cosmic rays
journal, January 2018

  • Reinert, Annika; Winkler, Martin Wolfgang
  • Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 01
  • DOI: 10.1088/1475-7516/2018/01/055

Constrained Local UniversE Simulations: a Local Group factory
journal, February 2016

  • Carlesi, Edoardo; Sorce, Jenny G.; Hoffman, Yehuda
  • Monthly Notices of the Royal Astronomical Society, Vol. 458, Issue 1
  • DOI: 10.1093/mnras/stw357

Anisotropies in the diffuse gamma-ray background from dark matter with Fermi LAT: a closer look: Anisotropies in gamma-rays from dark matter
journal, April 2011


The M31 globular cluster system: ugriz and K -band photometry and structural parameters
journal, February 2010

  • Peacock, Mark B.; Maccarone, Thomas J.; Knigge, Christian
  • Monthly Notices of the Royal Astronomical Society, Vol. 402, Issue 2
  • DOI: 10.1111/j.1365-2966.2009.15952.x

Bremsstrahlung gamma rays from light dark matter
journal, November 2013

  • Cirelli, Marco; Serpico, Pasquale D.; Zaharijas, Gabrijela
  • Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 11
  • DOI: 10.1088/1475-7516/2013/11/035

A Wide-Field High-Resolution h i Mosaic of Messier 31. i. Opaque Atomic gas and star Formation rate Density
journal, April 2009


Propagation of Cosmic‐Ray Nucleons in the Galaxy
journal, December 1998

  • Strong, Andrew W.; Moskalenko, Igor V.
  • The Astrophysical Journal, Vol. 509, Issue 1
  • DOI: 10.1086/306470

Constraining dark matter candidates from structure formation
journal, October 2001


THE MURMUR OF THE HIDDEN MONSTER: CHANDRA 'S DECADAL VIEW OF THE SUPERMASSIVE BLACK HOLE IN M31
journal, January 2011


Conservative constraints on dark matter annihilation into gamma rays
journal, September 2008


The Milky Way'S dark Matter halo Appears to be Lopsided
journal, May 2009


Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters
journal, December 2010

  • Dugger, Leanna; Jeltema, Tesla E.; Profumo, Stefano
  • Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 12
  • DOI: 10.1088/1475-7516/2010/12/015

The rotation of the Andromeda Nebula
journal, January 1939


Radio Properties of Infrared‐Selected Galaxies in the IRAS 2 Jy Sample
journal, June 2001

  • Yun, Min S.; Reddy, Naveen A.; Condon, J. J.
  • The Astrophysical Journal, Vol. 554, Issue 2
  • DOI: 10.1086/323145

Galactic dark matter search via phenomenological astrophysics modeling
journal, April 2016

  • Huang, Xiaoyuan; Enßlin, Torsten; Selig, Marco
  • Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 04
  • DOI: 10.1088/1475-7516/2016/04/030

PAndAS IN THE MIST: THE STELLAR AND GASEOUS MASS WITHIN THE HALOS OF M31 AND M33
journal, December 2012

  • Lewis, Geraint F.; Braun, Robert; McConnachie, Alan W.
  • The Astrophysical Journal, Vol. 763, Issue 1
  • DOI: 10.1088/0004-637X/763/1/4

The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
journal, September 2005


Spherical cows in dark matter indirect detection
journal, December 2016

  • Bernal, Nicolás; Necib, Lina; Slatyer, Tracy R.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 12
  • DOI: 10.1088/1475-7516/2016/12/030

Diffuse Galactic Continuum Gamma Rays: A Model Compatible with EGRET Data and Cosmic‐Ray Measurements
journal, October 2004

  • Strong, Andrew W.; Moskalenko, Igor V.; Reimer, Olaf
  • The Astrophysical Journal, Vol. 613, Issue 2
  • DOI: 10.1086/423193

A study of M31, M87, NGC 253, and M82 in high-energy gamma rays
journal, May 1994

  • Sreekumar, P.; Bertsch, D. L.; Dingus, B. L.
  • The Astrophysical Journal, Vol. 426
  • DOI: 10.1086/174044

Fitting the Fermi-LAT GeV excess: On the importance of including the propagation of electrons from dark matter
journal, August 2014


The old and heavy bulge of M 31: I. Kinematics and stellar populations
journal, January 2010


Inferring the Andromeda Galaxy's mass from its giant southern stream with Bayesian simulation sampling
journal, August 2013

  • Fardal, Mark A.; Weinberg, Martin D.; Babul, Arif
  • Monthly Notices of the Royal Astronomical Society, Vol. 434, Issue 4
  • DOI: 10.1093/mnras/stt1121

Production and Propagation of Cosmic‐Ray Positrons and Electrons
journal, February 1998

  • Moskalenko, I. V.; Strong, A. W.
  • The Astrophysical Journal, Vol. 493, Issue 2
  • DOI: 10.1086/305152

A survey of HI gas toward the Andromeda galaxy
journal, April 2016


A review of indirect searches for particle dark matter
journal, June 2016


Fermi Large Area Telescope observations of Local Group galaxies: detection of M 31 and search for M 33
journal, November 2010


Constraints on the dark matter annihilation from Fermi-LAT observation of M31
journal, December 2016

  • Li, Zhengwei; Huang, Xiaoyuan; Yuan, Qiang
  • Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 12
  • DOI: 10.1088/1475-7516/2016/12/028

Internal and External Alignment of the Shapes and Angular Momenta of ΛCDM Halos
journal, July 2005

  • Bailin, Jeremy; Steinmetz, Matthias
  • The Astrophysical Journal, Vol. 627, Issue 2
  • DOI: 10.1086/430397

X-Ray and Radio Variability of M31*, the Andromeda Galaxy Nuclear Supermassive Black hole
journal, January 2010

  • Garcia, Michael R.; Hextall, Richard; Baganoff, Frederick K.
  • The Astrophysical Journal, Vol. 710, Issue 1
  • DOI: 10.1088/0004-637X/710/1/755

Darwin Tames an Andromeda Dwarf: Unraveling the Orbit of NGC 205 Using a Genetic Algorithm
journal, August 2008

  • Howley, K. M.; Geha, M.; Guhathakurta, P.
  • The Astrophysical Journal, Vol. 683, Issue 2
  • DOI: 10.1086/589632

The Shapes, Orientation, and Alignment of Galactic Dark Matter Subhalos
journal, December 2007

  • Kuhlen, Michael; Diemand, Jurg; Madau, Piero
  • The Astrophysical Journal, Vol. 671, Issue 2
  • DOI: 10.1086/522878

The GALEX Ultraviolet Atlas of Nearby Galaxies
journal, December 2007

  • Gil de Paz, Armando; Boissier, Samuel; Madore, Barry F.
  • The Astrophysical Journal Supplement Series, Vol. 173, Issue 2
  • DOI: 10.1086/516636

The Puzzling Features of the Interstellar Medium in NGC 205
journal, May 1998

  • Welch, Gary A.; Sage, Leslie J.; Mitchell, George F.
  • The Astrophysical Journal, Vol. 499, Issue 1
  • DOI: 10.1086/305609

Deciphering the Local Interstellar Spectra of Primary Cosmic-Ray Species with HelMod
journal, May 2018

  • Boschini, M. J.; Torre, S. Della; Gervasi, M.
  • The Astrophysical Journal, Vol. 858, Issue 1
  • DOI: 10.3847/1538-4357/aabc54

Search for Primary Cosmic Gamma Rays with the Satellite Explorer XI
journal, February 1962


THE PAndAS VIEW OF THE ANDROMEDA SATELLITE SYSTEM. I. A BAYESIAN SEARCH FOR DWARF GALAXIES USING SPATIAL AND COLOR-MAGNITUDE INFORMATION
journal, October 2013

  • Martin, Nicolas F.; Ibata, Rodrigo A.; McConnachie, Alan W.
  • The Astrophysical Journal, Vol. 776, Issue 2
  • DOI: 10.1088/0004-637X/776/2/80

Profiles of dark haloes: evolution, scatter and environment
journal, March 2001


Parameterization of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\gamma ,\, e^{\pm }$ \end{document} , and Neutrino Spectra Produced by p‐p Interaction in Astronomical Environments
journal, August 2006

  • Kamae, Tuneyoshi; Karlsson, Niklas; Mizuno, Tsunefumi
  • The Astrophysical Journal, Vol. 647, Issue 1
  • DOI: 10.1086/505189

The nature of the Diffuse Gamma-Ray Background
journal, October 2015


A Bayesian Approach to Locating the red Giant Branch tip Magnitude. ii. Distances to the Satellites of m31
journal, September 2012


Neutralino annihilation into γ rays in the Milky Way and in external galaxies
journal, November 2004


The rotation curve and geometry of M 31 at large galactocentric distances.
journal, October 1975

  • Roberts, M. S.; Whitehurst, R. N.
  • The Astrophysical Journal, Vol. 201
  • DOI: 10.1086/153889

The outer halo globular cluster system of M31 – II. Kinematics
journal, June 2014

  • Veljanoski, J.; Mackey, A. D.; Ferguson, A. M. N.
  • Monthly Notices of the Royal Astronomical Society, Vol. 442, Issue 4
  • DOI: 10.1093/mnras/stu1055

Globular clusters in the outer halo of M31: the survey
journal, April 2008


Evidence of Fermi bubbles around M31
journal, March 2016

  • Pshirkov, M. S.; Vasiliev, V. V.; Postnov, K. A.
  • Monthly Notices of the Royal Astronomical Society: Letters
  • DOI: 10.1093/mnrasl/slw045

The CO-to-H 2 Conversion Factor
journal, August 2013


Does m31 Result from an Ancient Major Merger?
journal, November 2010


ETHOS—an effective theory of structure formation: From dark particle physics to the matter distribution of the Universe
journal, June 2016


FERMI -LAT OBSERVATIONS OF THE DIFFUSE γ-RAY EMISSION: IMPLICATIONS FOR COSMIC RAYS AND THE INTERSTELLAR MEDIUM
journal, April 2012


Evidence for an Accretion Origin for the Outer halo Globular Cluster System of m31
journal, June 2010


Where will supersymmetric dark matter first be seen?: Dark matter
journal, October 2011


High-energy Gamma Rays from the Milky Way: Three-dimensional Spatial Models for the Cosmic-Ray and Radiation Field Densities in the Interstellar Medium
journal, August 2017

  • Porter, T. A.; Jóhannesson, G.; Moskalenko, I. V.
  • The Astrophysical Journal, Vol. 846, Issue 1
  • DOI: 10.3847/1538-4357/aa844d

A Universal Density Profile from Hierarchical Clustering
journal, December 1997

  • Navarro, Julio F.; Frenk, Carlos S.; White, Simon D. M.
  • The Astrophysical Journal, Vol. 490, Issue 2
  • DOI: 10.1086/304888

A spiral nebula as a stellar system, Messier 31.
journal, March 1929

  • Hubble, E. P.
  • The Astrophysical Journal, Vol. 69
  • DOI: 10.1086/143167

The properties of warm dark matter haloes
journal, February 2014

  • Lovell, Mark R.; Frenk, Carlos S.; Eke, Vincent R.
  • Monthly Notices of the Royal Astronomical Society, Vol. 439, Issue 1
  • DOI: 10.1093/mnras/stt2431

Dusty Waves on a Starry Sea: The Mid-Infrared View of M31
journal, September 2006

  • Barmby, P.; Ashby, M. L. N.; Bianchi, L.
  • The Astrophysical Journal, Vol. 650, Issue 1
  • DOI: 10.1086/508626

A New Giant Stellar Structure in the Outer Halo of M31
journal, August 2004

  • Zucker, Daniel B.; Kniazev, Alexei Y.; Bell, Eric F.
  • The Astrophysical Journal, Vol. 612, Issue 2
  • DOI: 10.1086/424706

Herschel and JCMT observations of the early-type dwarf galaxy NGC 205 : Herschel
journal, May 2012


The Lopsidedness of Satellite Galaxy Systems in ΛCDM Simulations
journal, November 2017

  • Pawlowski, Marcel S.; Ibata, Rodrigo A.; Bullock, James S.
  • The Astrophysical Journal, Vol. 850, Issue 2
  • DOI: 10.3847/1538-4357/aa9435

Resolving small-scale dark matter structures using multisource indirect detection
journal, April 2014


The H i Distribution of the Milky Way
journal, September 2009


Dark matter and pulsar model constraints from Galactic Center Fermi-LAT gamma-ray observations
journal, October 2013


A tale of tails: Dark matter interpretations of the Fermi GeV excess in light of background model systematics
journal, March 2015


The outer halo globular cluster system of M31 – I. The final PAndAS catalogue
journal, June 2014

  • Huxor, A. P.; Mackey, A. D.; Ferguson, A. M. N.
  • Monthly Notices of the Royal Astronomical Society, Vol. 442, Issue 3
  • DOI: 10.1093/mnras/stu771

Astrophysical and dark matter interpretations of extended gamma-ray emission from the Galactic Center
journal, July 2014


Evidence for Stellar Substructure in the Halo and Outer Disk of M31
journal, September 2002

  • Ferguson, Annette M. N.; Irwin, Michael J.; Ibata, Rodrigo A.
  • The Astronomical Journal, Vol. 124, Issue 3
  • DOI: 10.1086/342019

Inverse Compton Origin of the Hard X‐Ray and Soft Gamma‐Ray Emission from the Galactic Ridge
journal, July 2008

  • Porter, Troy A.; Moskalenko, Igor V.; Strong, Andrew W.
  • The Astrophysical Journal, Vol. 682, Issue 1
  • DOI: 10.1086/589615

Radio and Far‐Infrared Emission as Tracers of Star Formation and Active Galactic Nuclei in Nearby Cluster Galaxies
journal, January 2004

  • Reddy, Naveen A.; Yun, Min S.
  • The Astrophysical Journal, Vol. 600, Issue 2
  • DOI: 10.1086/379871

Supersymmetric dark matter in M31: can one see neutralino annihilation with CELESTE?
journal, January 2004


Mapping extragalactic dark matter annihilation with galaxy surveys: A systematic study of stacked group searches
journal, March 2018

  • Lisanti, Mariangela; Mishra-Sharma, Siddharth; Rodd, Nicholas L.
  • Physical Review D, Vol. 97, Issue 6
  • DOI: 10.1103/PhysRevD.97.063005

The Third EGRET Catalog of High‐Energy Gamma‐Ray Sources
journal, July 1999

  • Hartman, R. C.; Bertsch, D. L.; Bloom, S. D.
  • The Astrophysical Journal Supplement Series, Vol. 123, Issue 1
  • DOI: 10.1086/313231

The Extended H i Rotation Curve and Mass Distribution of M31
journal, March 2006

  • Carignan, Claude; Chemin, Laurent; Huchtmeier, Walter K.
  • The Astrophysical Journal, Vol. 641, Issue 2
  • DOI: 10.1086/503869

Dark matter interpretation of the Fermi -LAT observation toward the Galactic Center
journal, May 2017


Constraints on decaying dark matter from the isotropic gamma-ray background
journal, March 2019


Galactic halo models and particle dark-matter detection
journal, March 1998


Large-scale background temperature and mass fluctuations due to scale-invariant primeval perturbations
journal, December 1982

  • Peebles, P. J. E.
  • The Astrophysical Journal, Vol. 263
  • DOI: 10.1086/183911

FERMI -LAT OBSERVATIONS OF HIGH-ENERGY γ -RAY EMISSION TOWARD THE GALACTIC CENTER
journal, February 2016


High‐Velocity Clouds: Building Blocks of the Local Group
journal, April 1999

  • Blitz, Leo; Spergel, David N.; Teuben, Peter J.
  • The Astrophysical Journal, Vol. 514, Issue 2
  • DOI: 10.1086/306963

Circum-Galactic gas and the Isotropic Gamma-Ray Background
journal, December 2012


The Three-dimensional Spatial Distribution of Interstellar Gas in the Milky Way: Implications for Cosmic Rays and High-energy Gamma-ray Emissions
journal, March 2018

  • Jóhannesson, Guđlaugur; Porter, Troy A.; Moskalenko, Igor V.
  • The Astrophysical Journal, Vol. 856, Issue 1
  • DOI: 10.3847/1538-4357/aab26e

Nuclear Enhancement of the Photon Yield in Cosmic ray Interactions
journal, June 2014

  • Kachelriess, Michael; Moskalenko, Igor V.; Ostapchenko, Sergey S.
  • The Astrophysical Journal, Vol. 789, Issue 2
  • DOI: 10.1088/0004-637X/789/2/136

The Cluster of blue Stars Surrounding the m31 Nuclear Black hole
journal, January 2012


Characterization of subhalo structural properties and implications for dark matter annihilation signals
journal, January 2017

  • Moliné, Ángeles; Sánchez-Conde, Miguel A.; Palomares-Ruiz, Sergio
  • Monthly Notices of the Royal Astronomical Society
  • DOI: 10.1093/mnras/stx026

Novel Dark Matter Constraints from Antiprotons in Light of AMS-02
journal, May 2017


Suppressing structure formation at dwarf galaxy scales and below: Late kinetic decoupling as a compelling alternative to warm dark matter
journal, November 2016


The Milky Way in Molecular Clouds: A New Complete CO Survey
journal, February 2001

  • Dame, T. M.; Hartmann, Dap; Thaddeus, P.
  • The Astrophysical Journal, Vol. 547, Issue 2
  • DOI: 10.1086/318388

GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates
journal, June 2015


Dark Matter Substructure and Gamma‐Ray Annihilation in the Milky Way Halo
journal, March 2007

  • Diemand, Jurg; Kuhlen, Michael; Madau, Piero
  • The Astrophysical Journal, Vol. 657, Issue 1
  • DOI: 10.1086/510736

Mapping and Mass Measurement of the Cold Dust in NGC 205 with Spitzer
journal, August 2006

  • Marleau, F. R.; Noriega‐Crespo, A.; Misselt, K. A.
  • The Astrophysical Journal, Vol. 646, Issue 2
  • DOI: 10.1086/504975

The flattening of the concentration–mass relation towards low halo masses and its implications for the annihilation signal boost
journal, June 2014

  • Sánchez-Conde, Miguel A.; Prada, Francisco
  • Monthly Notices of the Royal Astronomical Society, Vol. 442, Issue 3
  • DOI: 10.1093/mnras/stu1014

THE FERMI LARGE AREA TELESCOPE ON ORBIT: EVENT CLASSIFICATION, INSTRUMENT RESPONSE FUNCTIONS, AND CALIBRATION
journal, October 2012

  • Ackermann, M.; Ajello, M.; Albert, A.
  • The Astrophysical Journal Supplement Series, Vol. 203, Issue 1
  • DOI: 10.1088/0067-0049/203/1/4

The Flattened Dark Matter Halo of M31 as Deduced from the Observed H i Scale Heights
journal, September 2008

  • Banerjee, Arunima; Jog, Chanda J.
  • The Astrophysical Journal, Vol. 685, Issue 1
  • DOI: 10.1086/591223

Supersymmetry, Cosmology, and New Physics at Teraelectronvolt Energies
journal, January 1982


The spin and shape of dark matter haloes in the Millennium simulation of a Λ cold dark matter universe
journal, March 2007


Evidence for a Massive, Extended Circumgalactic Medium Around the Andromeda Galaxy
journal, May 2015

  • Lehner, Nicolas; Howk, J. Christopher; Wakker, Bart P.
  • The Astrophysical Journal, Vol. 804, Issue 2
  • DOI: 10.1088/0004-637X/804/2/79

A huge Reservoir of Ionized gas Around the Milky way: Accounting for the Missing Mass?
journal, August 2012


HelMod in the Works: From Direct Observations to the Local Interstellar Spectrum of Cosmic-Ray Electrons
journal, February 2018

  • Boschini, M. J.; Torre, S. Della; Gervasi, M.
  • The Astrophysical Journal, Vol. 854, Issue 2
  • DOI: 10.3847/1538-4357/aaa75e

Is the dark halo of our Galaxy spherical?
journal, June 2004


Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds
journal, June 1998

  • Schlegel, David J.; Finkbeiner, Douglas P.; Davis, Marc
  • The Astrophysical Journal, Vol. 500, Issue 2
  • DOI: 10.1086/305772

Masses and Mass-To-Light Ratios of Galaxies
journal, September 1979


Revisiting the radial distribution of pulsars in the Galaxy
journal, July 2004


Spiral Structure in M31.
journal, May 1964


The shape of the gravitational potential in cold dark matter haloes
journal, May 2007


Sensitivity of HAWC to high-mass dark matter annihilations
journal, December 2014


Improved cosmic-ray injection models and the Galactic Center gamma-ray excess
journal, September 2016


Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data
journal, November 2015


Current status and desired precision of the isotopic production cross sections relevant to astrophysics of cosmic rays: Li, Be, B, C, and N
journal, September 2018


Major substructure in the M31 outer halo: distances and metallicities along the giant stellar stream
journal, March 2016

  • Conn, A. R.; McMonigal, B.; Bate, N. F.
  • Monthly Notices of the Royal Astronomical Society, Vol. 458, Issue 3
  • DOI: 10.1093/mnras/stw513

High-Velocity Cloud Complex H: A Satellite of the Milky Way in a Retrograde Orbit?
journal, June 2003

  • Lockman, Felix J.
  • The Astrophysical Journal, Vol. 591, Issue 1
  • DOI: 10.1086/376961

Project AMIGA: A Minimal Covering Factor for Optically Thick Circumgalactic Gas around the Andromeda Galaxy
journal, September 2017

  • Howk, J. Christopher; Wotta, Christopher B.; Berg, Michelle A.
  • The Astrophysical Journal, Vol. 846, Issue 2
  • DOI: 10.3847/1538-4357/aa87b4

The Haunted Halos of Andromeda and Triangulum: A Panorama of Galaxy Formation in Action
journal, December 2007

  • Ibata, R.; Martin, N. F.; Irwin, M.
  • The Astrophysical Journal, Vol. 671, Issue 2
  • DOI: 10.1086/522574

A Method Based on Wavelet Transforms for Source Detection in Photon‐counting Detector Images. I. Theory and General Properties
journal, July 1997

  • Damiani, F.; Maggio, A.; Micela, G.
  • The Astrophysical Journal, Vol. 483, Issue 1
  • DOI: 10.1086/304217

Anisotropic Inverse Compton Scattering in the Galaxy
journal, January 2000

  • Moskalenko, Igor V.; Strong, Andrew W.
  • The Astrophysical Journal, Vol. 528, Issue 1
  • DOI: 10.1086/308138

Bayesian Analysis of Cosmic ray Propagation: Evidence Against Homogeneous Diffusion
journal, June 2016

  • Jóhannesson, G.; Austri, R. Ruiz de; Vincent, A. C.
  • The Astrophysical Journal, Vol. 824, Issue 1
  • DOI: 10.3847/0004-637X/824/1/16

The Cosmological Significance of High‐Velocity Cloud Complex H
journal, March 2006

  • Simon, Joshua D.; Blitz, Leo; Cole, Andrew A.
  • The Astrophysical Journal, Vol. 640, Issue 1
  • DOI: 10.1086/499914

The Rotation and Radial Velocity of the Central Part of the Andromeda Nebula
journal, January 1918

  • Pease, F. G.
  • Proceedings of the National Academy of Sciences, Vol. 4, Issue 1
  • DOI: 10.1073/pnas.4.1.21

The on-orbit calibration of the Fermi Large Area Telescope
journal, October 2009


Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions
journal, January 1970

  • Rubin, Vera C.; Ford, W. Kent, Jr.
  • The Astrophysical Journal, Vol. 159
  • DOI: 10.1086/150317

Distance to M31 with the [ITAL]Hubble Space Telescope[/ITAL] and [ITAL]Hipparcos[/ITAL] Red Clump Stars
journal, August 1998

  • Stanek, K. Z.; Garnavich, P. M.
  • The Astrophysical Journal, Vol. 503, Issue 2
  • DOI: 10.1086/311539

Planck intermediate results : XXV. The Andromeda galaxy as seen by
journal, September 2015


Cores in warm dark matter haloes: a Catch 22 problem: Cores in warm dark matter haloes
journal, June 2012

  • Macciò, Andrea V.; Paduroiu, Sinziana; Anderhalden, Donnino
  • Monthly Notices of the Royal Astronomical Society, Vol. 424, Issue 2
  • DOI: 10.1111/j.1365-2966.2012.21284.x

The shape of dark matter haloes: dependence on mass, redshift, radius and formation
journal, April 2006


LOCAL H i EMISSIVITY MEASURED WITH FERMI -LAT AND IMPLICATIONS FOR COSMIC-RAY SPECTRA
journal, June 2015


The Vertical Structure of Warm Ionised Gas in the Milky Way
journal, January 2008

  • Gaensler, B. M.; Madsen, G. J.; Chatterjee, S.
  • Publications of the Astronomical Society of Australia, Vol. 25, Issue 4
  • DOI: 10.1071/AS08004

Effects of velocity-dependent dark matter annihilation on the energy spectrum of the extragalactic gamma-ray background
journal, November 2010


Major substructure in the M31 Outer Halo: the East Cloud
journal, December 2015

  • McMonigal, B.; Bate, N. F.; Conn, A. R.
  • Monthly Notices of the Royal Astronomical Society, Vol. 456, Issue 1
  • DOI: 10.1093/mnras/stv2690

A wide-field H I mosaic of Messier 31: II. The disk warp, rotation, and the dark matter halo
journal, February 2010


GALACTIC COSMIC RAYS IN THE LOCAL INTERSTELLAR MEDIUM: VOYAGER 1 OBSERVATIONS AND MODEL RESULTS
journal, October 2016


Two emission mechanisms in the Fermi Bubbles: A possible signal of annihilating dark matter
journal, September 2013


A unified model for the spatial and mass distribution of subhaloes
journal, February 2016

  • Han, Jiaxin; Cole, Shaun; Frenk, Carlos S.
  • Monthly Notices of the Royal Astronomical Society, Vol. 457, Issue 2
  • DOI: 10.1093/mnras/stv2900

Progressively more Prolate dark Matter halo in the Outer Galaxy as Traced by Flaring h i gas
journal, April 2011


Dissecting the gamma-ray background in search of dark matter
journal, February 2014

  • Cholis, Ilias; Hooper, Dan; McDermott, Samuel D.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 02
  • DOI: 10.1088/1475-7516/2014/02/014

THE NATURE AND ORIGIN OF SUBSTRUCTURE IN THE OUTSKIRTS OF M31. I. SURVEYING THE STELLAR CONTENT WITH THE HUBBLE SPACE TELESCOPE ADVANCED CAMERA FOR SURVEYS
journal, April 2008


Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates
journal, June 2012

  • van den Aarssen, Laura G.; Bringmann, Torsten; Goedecke, Yaşar C.
  • Physical Review D, Vol. 85, Issue 12
  • DOI: 10.1103/PhysRevD.85.123512

On the Accretion Origin of a Vast Extended Stellar Disk around the Andromeda Galaxy
journal, November 2005

  • Ibata, R.; Chapman, S.; Ferguson, A. M. N.
  • The Astrophysical Journal, Vol. 634, Issue 1
  • DOI: 10.1086/491727

ΛCDM‐based Models for the Milky Way and M31. I. Dynamical Models
journal, July 2002

  • Klypin, Anatoly; Zhao, HongSheng; Somerville, Rachel S.
  • The Astrophysical Journal, Vol. 573, Issue 2
  • DOI: 10.1086/340656

The nature and origin of substructure in the outskirts of M31 – II. Detailed star formation histories★
journal, November 2014

  • Bernard, Edouard J.; Ferguson, Annette M. N.; Richardson, Jenny C.
  • Monthly Notices of the Royal Astronomical Society, Vol. 446, Issue 3
  • DOI: 10.1093/mnras/stu2309

Distances and metallicities for 17 Local Group galaxies
journal, January 2005

  • McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.
  • Monthly Notices of the Royal Astronomical Society, Vol. 356, Issue 3
  • DOI: 10.1111/j.1365-2966.2004.08514.x

The young stellar population at the center of NGC 205
journal, July 2009


The spin and Orientation of dark Matter Halos Within Cosmic Filaments
journal, November 2009


Cosmic-Ray Propagation and Interactions in the Galaxy
journal, November 2007


The mass–concentration–redshift relation of cold and warm dark matter haloes
journal, May 2016

  • Ludlow, Aaron D.; Bose, Sownak; Angulo, Raúl E.
  • Monthly Notices of the Royal Astronomical Society, Vol. 460, Issue 2
  • DOI: 10.1093/mnras/stw1046

Scattering, damping, and acoustic oscillations: Simulating the structure of dark matter halos with relativistic force carriers
journal, August 2014

  • Buckley, Matthew R.; Zavala, Jesús; Cyr-Racine, Francis-Yan
  • Physical Review D, Vol. 90, Issue 4
  • DOI: 10.1103/PhysRevD.90.043524

An all–sky study of compact, isolated high–velocity clouds
journal, August 2002


Constraints on large-scale dark acoustic oscillations from cosmology
journal, March 2014

  • Cyr-Racine, Francis-Yan; de Putter, Roland; Raccanelli, Alvise
  • Physical Review D, Vol. 89, Issue 6
  • DOI: 10.1103/PhysRevD.89.063517

Radio Continuum and Star Formation in CO-rich Early-Type Galaxies
journal, October 2007

  • Lucero, Danielle M.; Young, Lisa M.
  • The Astronomical Journal, Vol. 134, Issue 6
  • DOI: 10.1086/522886

Hidden charged dark matter
journal, July 2009

  • Feng, Jonathan L.; Kaplinghat, Manoj; Tu, Huitzu
  • Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 07
  • DOI: 10.1088/1475-7516/2009/07/004

Molecular and atomic gas in the Local Group galaxy M 33
journal, October 2010


IRIS: A New Generation of IRAS Maps
journal, April 2005

  • Miville‐Deschenes, Marc‐Antoine; Lagache, Guilaine
  • The Astrophysical Journal Supplement Series, Vol. 157, Issue 2
  • DOI: 10.1086/427938

HI4PI: a full-sky H i survey based on EBHIS and GASS
journal, October 2016


Radial distribution of the diffuse γ -ray emissivity in the Galactic disk
journal, June 2016


Evidence for a Triaxial Milky way dark Matter halo from the Sagittarius Stellar Tidal Stream
journal, September 2009

  • Law, David R.; Majewski, Steven R.; Johnston, Kathryn V.
  • The Astrophysical Journal, Vol. 703, Issue 1
  • DOI: 10.1088/0004-637X/703/1/L67

A New Model for the Loop I (North Polar Spur) Region
journal, July 2007

  • Wolleben, M.
  • The Astrophysical Journal, Vol. 664, Issue 1
  • DOI: 10.1086/518711

The graininess of dark matter haloes
journal, April 2009


The Likelihood Analysis of EGRET Data
journal, April 1996

  • Mattox, J. R.; Bertsch, D. L.; Chiang, J.
  • The Astrophysical Journal, Vol. 461
  • DOI: 10.1086/177068

High-energy gamma-ray results from the second small astronomy satellite
journal, May 1975

  • Fichtel, C. E.; Hartman, R. C.; Kniffen, D. A.
  • The Astrophysical Journal, Vol. 198
  • DOI: 10.1086/153590

Signatures of self-interacting dark matter in the matter power spectrum and the CMB
journal, August 2018


The Fermi Galactic Center GeV Excess and Implications for Dark Matter
journal, May 2017


A Kinematic Study of the Andromeda Dwarf Spheroidal System
journal, April 2013

  • Collins, Michelle L. M.; Chapman, Scott C.; Rich, R. Michael
  • The Astrophysical Journal, Vol. 768, Issue 2
  • DOI: 10.1088/0004-637X/768/2/172

The Radial Distribution of Cold Atomic Hydrogen in the Galaxy
journal, October 2002

  • Kolpak, Michal A.; Jackson, James M.; Bania, T. M.
  • The Astrophysical Journal, Vol. 578, Issue 2
  • DOI: 10.1086/342659

Stellar mass map and dark matter distribution in M 31
journal, September 2012


FERMI -LAT OBSERVATIONS OF HIGH- AND INTERMEDIATE-VELOCITY CLOUDS: TRACING COSMIC RAYS IN THE HALO OF THE MILKY WAY
journal, July 2015


FERMI LARGE AREA TELESCOPE STUDY OF COSMIC RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS
journal, July 2012


Unveiling Extensive Clouds of Dark Gas in the Solar Neighborhood
journal, February 2005


Where do Galaxies end?
journal, March 2014


Carbon Star Survey in the Local Group. VI. The Dwarf Spheroidal Galaxy NGC 205
journal, June 2003

  • Demers, Serge; Battinelli, Paolo; Letarte, Bruno
  • The Astronomical Journal, Vol. 125, Issue 6
  • DOI: 10.1086/375309

Observations of M31 and M33 with the Fermi Large Area Telescope: A Galactic Center Excess in Andromeda?
journal, February 2017


FERMI LAT OBSERVATION OF DIFFUSE GAMMA RAYS PRODUCED THROUGH INTERACTIONS BETWEEN LOCAL INTERSTELLAR MATTER AND HIGH-ENERGY COSMIC RAYS
journal, September 2009


Solution of Heliospheric Propagation: Unveiling the Local Interstellar Spectra of Cosmic-ray Species
journal, May 2017

  • Boschini, M. J.; Torre, S. Della; Gervasi, M.
  • The Astrophysical Journal, Vol. 840, Issue 2
  • DOI: 10.3847/1538-4357/aa6e4f

Polarized radio filaments outside the Galactic plane
journal, July 2015

  • Vidal, Matias; Dickinson, C.; Davies, R. D.
  • Monthly Notices of the Royal Astronomical Society, Vol. 452, Issue 1
  • DOI: 10.1093/mnras/stv1328

THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
journal, May 2009


Constraints on Dark Matter interactions from structure formation: damping lengths
journal, July 2005


Origin of the gamma rays from the Galactic Center
journal, December 2011


Large-Scale Structure Tests of Warm Dark Matter
journal, February 1996

  • Colombi, Stephane; Dodelson, Scott; Widrow, Lawrence M.
  • The Astrophysical Journal, Vol. 458
  • DOI: 10.1086/176788

Ground- and Space-Based Gamma-Ray Astronomy
journal, October 2015


On the radial distribution of Galactic cosmic rays
journal, July 2016

  • Recchia, S.; Blasi, P.; Morlino, G.
  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 462, Issue 1
  • DOI: 10.1093/mnrasl/slw136

The distribution of cosmic-ray sources in the Galaxy, γ-rays and the gradient in the CO-to-H 2 relation
journal, July 2004


Cosmological bounds on the masses of stable, right-handed neutrinos
journal, January 1982


Diffuse Continuum Gamma Rays from the Galaxy
journal, July 2000

  • Strong, Andrew W.; Moskalenko, Igor V.; Reimer, Olaf
  • The Astrophysical Journal, Vol. 537, Issue 2
  • DOI: 10.1086/309038

The Observed Properties of Dwarf Galaxies in and Around the Local Group
journal, June 2012


GALPROP WebRun: An internet-based service for calculating galactic cosmic ray propagation and associated photon emissions
journal, May 2011

  • Vladimirov, A. E.; Digel, S. W.; Jóhannesson, G.
  • Computer Physics Communications, Vol. 182, Issue 5
  • DOI: 10.1016/j.cpc.2011.01.017

High-Energy Cosmic Gamma-Ray Observations from the OSO-3 Satellite
journal, October 1972

  • Kraushaar, W. L.; Clark, G. W.; Garmire, G. P.
  • The Astrophysical Journal, Vol. 177
  • DOI: 10.1086/151713

Major substructure in the M31 outer halo: the South-West Cloud★
journal, December 2013

  • Bate, N. F.; Conn, A. R.; McMonigal, B.
  • Monthly Notices of the Royal Astronomical Society, Vol. 437, Issue 4
  • DOI: 10.1093/mnras/stt2139

Deriving the cosmic ray spectrum from gamma-ray observations
journal, August 2012


Cosmology of atomic dark matter
journal, May 2013


Discovery of a new galactic center excess consistent with upscattered starlight
journal, July 2015

  • Abazajian, Kevork N.; Canac, Nicolas; Horiuchi, Shunsaku
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 07
  • DOI: 10.1088/1475-7516/2015/07/013

The remnants of galaxy formation from a panoramic survey of the region around M31
journal, September 2009

  • McConnachie, Alan W.; Irwin, Michael J.; Ibata, Rodrigo A.
  • Nature, Vol. 461, Issue 7260
  • DOI: 10.1038/nature08327

Wimp searches with gamma rays in the Fermi era: Challenges, methods and results
journal, December 2015

  • Conrad, J.; Cohen-Tanugi, J.; Strigari, L. E.
  • Journal of Experimental and Theoretical Physics, Vol. 121, Issue 6
  • DOI: 10.1134/S1063776115130099

The characterization of the gamma-ray signal from the central Milky Way: A case for annihilating dark matter
journal, June 2016


DEVELOPMENT OF THE MODEL OF GALACTIC INTERSTELLAR EMISSION FOR STANDARD POINT-SOURCE ANALYSIS OF FERMI LARGE AREA TELESCOPE DATA
journal, April 2016

  • Acero, F.; Ackermann, M.; Ajello, M.
  • The Astrophysical Journal Supplement Series, Vol. 223, Issue 2
  • DOI: 10.3847/0067-0049/223/2/26

The Origin of the Extragalactic Gamma-Ray Background and Implications for dark Matter Annihilation
journal, February 2015


Chandra Detection of Diffuse Hot Gas in and around the M31 Bulge
journal, September 2007

  • Li, Zhiyuan; Wang, Q. Daniel
  • The Astrophysical Journal, Vol. 668, Issue 1
  • DOI: 10.1086/522674

The alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE and cosmo-OWLS simulations
journal, August 2015

  • Velliscig, Marco; Cacciato, Marcello; Schaye, Joop
  • Monthly Notices of the Royal Astronomical Society, Vol. 453, Issue 1
  • DOI: 10.1093/mnras/stv1690

The Aquarius Project: the subhaloes of galactic haloes
journal, December 2008


Matter power spectrum in hidden neutrino interacting dark matter models: a closer look at the collision term
journal, November 2016

  • Binder, Tobias; Covi, Laura; Kamada, Ayuki
  • Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 11
  • DOI: 10.1088/1475-7516/2016/11/043

A giant stream of metal-rich stars in the halo of the galaxy M31
journal, July 2001

  • Ibata, Rodrigo; Irwin, Michael; Lewis, Geraint
  • Nature, Vol. 412, Issue 6842
  • DOI: 10.1038/35083506

A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter
journal, May 2019


Point sources from dissipative dark matter
journal, December 2017


Background model systematics for the Fermi GeV excess
journal, March 2015

  • Calore, Francesca; Cholis, Ilias; Weniger, Christoph
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 03
  • DOI: 10.1088/1475-7516/2015/03/038