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Title: Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look

Abstract

A new measurement of a spatially extended gamma-ray signal from the center of the Andromeda galaxy (M31) has recently been published by the Fermi-LAT collaboration, reporting that the emission broadly resembles the so-called Galactic center excess (GCE) of the Milky Way (MW). The weight of the evidence is steadily accumulating on a millisecond pulsar (MSPs) origin for the GCE. These elements prompt us to compare these observations with what is, perhaps, the simplest model for an MSP population, which is solely obtained by rescaling of the MSP luminosity function that is determined in the local MW disk via the respective stellar mass of the systems. Remarkably, we find that without free fitting parameters, this model can account for both the energetics and the morphology of the GCE within uncertainties. For M31, the estimated luminosity due to primordial MSPs is expected to only contribute about a quarter of the detected emission, although a stronger contribution cannot be excluded given the large uncertainties. If correct, the model predicts that the M31 disk emission due to MSPs is not far below the present upper bound. We also discuss additional refinements of this simple model. Using the correlation between globular cluster gamma-ray luminosity andmore » stellar encounter rate, we gauge the dynamical MSP formation in the bulge. This component is expected to contribute to the GCE only at a level of ≲5%, it could affect the signal's morphology. In conclusion, we also comment on the limitations of our model and on future perspectives for improved diagnostics.« less

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6];  [7]; ORCiD logo [8];  [9]; ORCiD logo [9]; ORCiD logo [3]
  1. Univ. of Nova Gorica, Nova Gorica (Slovenia)
  2. Chinese Academy of Sciences, Kunming (People's Republic of China); Chinese Academy of Sciences, Beijing (People's Republic of China)
  3. Univ. Savoie Mont Blanc & CNRS, Annecy Cedex (France)
  4. Univ. of Wisconsin, Madison, WI (United States)
  5. Univ. of Nova Gorica, Nova Gorica (Slovenia); Instituto Nazionale di Fisica Nucleare - Sezione Trieste, Trieste (Italy)
  6. Univ. Paul Sabatier, Toulouse Cedex (France)
  7. Stanford Univ., Stanford, CA (United States)
  8. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  9. Univ. of Novi Sad, Novi Sad (Serbia)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1468959
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 862; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma rays: galaxies; Local Group; pulsars: general

Citation Formats

Eckner, Christopher, Hou, Xian, Serpico, Pasquale D., Winter, Miles, Zaharijas, Gabrijela, Martin, Pierrick, Mauro, Mattia di, Mirabal, Nestor, Petrovic, Jovana, Prodanovic, Tijana, and Vandenbroucke, Justin. Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aac029.
Eckner, Christopher, Hou, Xian, Serpico, Pasquale D., Winter, Miles, Zaharijas, Gabrijela, Martin, Pierrick, Mauro, Mattia di, Mirabal, Nestor, Petrovic, Jovana, Prodanovic, Tijana, & Vandenbroucke, Justin. Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look. United States. doi:10.3847/1538-4357/aac029.
Eckner, Christopher, Hou, Xian, Serpico, Pasquale D., Winter, Miles, Zaharijas, Gabrijela, Martin, Pierrick, Mauro, Mattia di, Mirabal, Nestor, Petrovic, Jovana, Prodanovic, Tijana, and Vandenbroucke, Justin. Wed . "Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look". United States. doi:10.3847/1538-4357/aac029. https://www.osti.gov/servlets/purl/1468959.
@article{osti_1468959,
title = {Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look},
author = {Eckner, Christopher and Hou, Xian and Serpico, Pasquale D. and Winter, Miles and Zaharijas, Gabrijela and Martin, Pierrick and Mauro, Mattia di and Mirabal, Nestor and Petrovic, Jovana and Prodanovic, Tijana and Vandenbroucke, Justin},
abstractNote = {A new measurement of a spatially extended gamma-ray signal from the center of the Andromeda galaxy (M31) has recently been published by the Fermi-LAT collaboration, reporting that the emission broadly resembles the so-called Galactic center excess (GCE) of the Milky Way (MW). The weight of the evidence is steadily accumulating on a millisecond pulsar (MSPs) origin for the GCE. These elements prompt us to compare these observations with what is, perhaps, the simplest model for an MSP population, which is solely obtained by rescaling of the MSP luminosity function that is determined in the local MW disk via the respective stellar mass of the systems. Remarkably, we find that without free fitting parameters, this model can account for both the energetics and the morphology of the GCE within uncertainties. For M31, the estimated luminosity due to primordial MSPs is expected to only contribute about a quarter of the detected emission, although a stronger contribution cannot be excluded given the large uncertainties. If correct, the model predicts that the M31 disk emission due to MSPs is not far below the present upper bound. We also discuss additional refinements of this simple model. Using the correlation between globular cluster gamma-ray luminosity and stellar encounter rate, we gauge the dynamical MSP formation in the bulge. This component is expected to contribute to the GCE only at a level of ≲5%, it could affect the signal's morphology. In conclusion, we also comment on the limitations of our model and on future perspectives for improved diagnostics.},
doi = {10.3847/1538-4357/aac029},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 862,
place = {United States},
year = {2018},
month = {7}
}

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Cited by: 8 works
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Figures / Tables:

Table 1 Table 1: Summary of sizes and stellar masses of MW and M31 subcomponents. The estimate of the spatial extension of M31's stellar disk is taken from (Courteau et al. (2011)) whereas the MW's stellar disk size is reported in Rix & Bovy (2013). References to the listed stellar masses aremore » given in the text.« less

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Works referenced in this record:

Probing the formation history of the nuclear star cluster at the Galactic Centre with millisecond pulsars
journal, September 2017

  • Abbate, F.; Mastrobuono-Battisti, A.; Colpi, M.
  • Monthly Notices of the Royal Astronomical Society, Vol. 473, Issue 1
  • DOI: 10.1093/mnras/stx2364

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


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


GeV OBSERVATIONS OF STAR-FORMING GALAXIES WITH THE FERMI LARGE AREA TELESCOPE
journal, August 2012


THE SPECTRUM AND MORPHOLOGY OF THE FERMI BUBBLES
journal, September 2014


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


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


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


Gamma-ray and X-ray emission from the Galactic centre: hints on the nuclear star cluster formation history
journal, June 2018

  • Arca-Sedda, Manuel; Kocsis, Bence; Brandt, Timothy D.
  • Monthly Notices of the Royal Astronomical Society, Vol. 479, Issue 1
  • DOI: 10.1093/mnras/sty1454

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


Stellar Encounter rate in Galactic Globular Clusters
journal, March 2013

  • Bahramian, Arash; Heinke, Craig O.; Sivakoff, Gregory R.
  • The Astrophysical Journal, Vol. 766, Issue 2
  • DOI: 10.1088/0004-637X/766/2/136

Comment on “Characterizing the population of pulsars in the Galactic bulge with the Fermi large area telescope” [arXiv:1705.00009v1]
journal, June 2018


Strong Support for the Millisecond Pulsar Origin of the Galactic Center GeV Excess
journal, February 2016


The outer rotation curve of the Milky Way
journal, May 1997

  • Binney, J.; Dehnen, W.
  • Monthly Notices of the Royal Astronomical Society, Vol. 287, Issue 1
  • DOI: 10.1093/mnras/287.1.L5

Disrupted Globular Clusters can Explain the Galactic Center Gamma-Ray Excess
journal, October 2015


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


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

A new photometric model of the Galactic bar using red clump giants
journal, July 2013

  • Cao, Liang; Mao, Shude; Nataf, David
  • Monthly Notices of the Royal Astronomical Society, Vol. 434, Issue 1
  • DOI: 10.1093/mnras/stt1045

Cosmic-Ray Injection from Star-Forming Regions
journal, September 2016


Cosmic ray protons in the inner Galaxy and the Galactic Center gamma-ray excess
journal, July 2014


The old nuclear star cluster in the Milky Way: dynamics, mass, statistical parallax, and black hole mass
journal, December 2014

  • Chatzopoulos, S.; Fritz, T. K.; Gerhard, O.
  • Monthly Notices of the Royal Astronomical Society, Vol. 447, Issue 1
  • DOI: 10.1093/mnras/stu2452

Dark matter and visible baryons in M33
journal, June 2003


Neutron Star Population Dynamics. I. Millisecond Pulsars
journal, June 1997

  • Cordes, J. M.; Chernoff, David F.
  • The Astrophysical Journal, Vol. 482, Issue 2
  • DOI: 10.1086/304179

The Luminosity Profile and Structural Parameters of the Andromeda Galaxy
journal, August 2011

  • Courteau, Stéphane; Widrow, Lawrence M.; McDonald, Michael
  • The Astrophysical Journal, Vol. 739, Issue 1
  • DOI: 10.1088/0004-637X/739/1/20

Neutron star retention and millisecond pulsar production in globular clusters
journal, November 1998


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


Common Solution to the Cosmic Ray Anisotropy and Gradient Problems
journal, May 2012


Tidal Capture Formation of Binary Systems and X-ray Sources in Globular Clusters
journal, July 1975

  • Fabian, A. C.; Pringle, J. E.; Rees, M. J.
  • Monthly Notices of the Royal Astronomical Society, Vol. 172, Issue 1
  • DOI: 10.1093/mnras/172.1.15P

A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope
journal, November 2010


HERSCHEL EXPLOITATION OF LOCAL GALAXY ANDROMEDA (HELGA). III. THE STAR FORMATION LAW IN M31
journal, May 2013

  • Ford, George P.; Gear, Walter K.; Smith, Matthew W. L.
  • The Astrophysical Journal, Vol. 769, Issue 1
  • DOI: 10.1088/0004-637X/769/1/55

Disrupted globular clusters and the gamma-ray excess in the Galactic Centre
journal, January 2018

  • Fragione, Giacomo; Antonini, Fabio; Gnedin, Oleg Y.
  • Monthly Notices of the Royal Astronomical Society, Vol. 475, Issue 4
  • DOI: 10.1093/mnras/sty183

X-Ray Binary Evolution Across Cosmic time
journal, January 2013


Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess
journal, December 2015

  • Gaggero, Daniele; Taoso, Marco; Urbano, Alfredo
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 12
  • DOI: 10.1088/1475-7516/2015/12/056

Masses and scaling relations for nuclear star clusters, and their co-existence with central black holes
journal, February 2016

  • Georgiev, Iskren Y.; Böker, Torsten; Leigh, Nathan
  • Monthly Notices of the Royal Astronomical Society, Vol. 457, Issue 2
  • DOI: 10.1093/mnras/stw093

Low-mass X-ray binaries as a stellar mass indicator for the host galaxy
journal, March 2004


Co-Evolution of Galactic Nuclei and Globular Cluster Systems
journal, March 2014

  • Gnedin, Oleg Y.; Ostriker, Jeremiah P.; Tremaine, Scott
  • The Astrophysical Journal, Vol. 785, Issue 1
  • DOI: 10.1088/0004-637X/785/1/71

The heating of dust by old stellar populations in the bulge of M31: The warm dust and old stars of M31's bulge
journal, September 2012


Low mass X-ray binaries in the Inner Galaxy: implications for millisecond pulsars and the GeV excess
journal, May 2017

  • Haggard, Daryl; Heinke, Craig; Hooper, Dan
  • Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 05
  • DOI: 10.1088/1475-7516/2017/05/056

The pulsar kick velocity distribution
journal, November 1997

  • Hansen, B. M. S.; Phinney, E. S.
  • Monthly Notices of the Royal Astronomical Society, Vol. 291, Issue 3
  • DOI: 10.1093/mnras/291.3.569

A Catalog of Parameters for Globular Clusters in the Milky Way
journal, October 1996

  • Harris, William E.
  • The Astronomical Journal, Vol. 112
  • DOI: 10.1086/118116

Pulsars as the sources of high energy cosmic ray positrons
journal, January 2009

  • Hooper, Dan; Blasi, Pasquale; Serpico, Pasquale Dario
  • Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 01
  • DOI: 10.1088/1475-7516/2009/01/025

Millisecond pulsars cannot account for the inner Galaxy’s GeV excess
journal, October 2013


The gamma-ray pulsar population of globular clusters: implications for the GeV excess
journal, August 2016


The gamma-ray luminosity function of millisecond pulsars and implications for the GeV excess
journal, March 2016


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


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

Dynamical Formation of Millisecond Pulsars in Globular Clusters
journal, April 2010


The Fundamental Plane of Gamma-Ray Globular Clusters
journal, December 2010


An improved bulge model for M31
journal, June 1989

  • Kent, Stephen M.
  • The Astronomical Journal, Vol. 97
  • DOI: 10.1086/115103

Planetary camera observations of the double nucleus of M31
journal, October 1993

  • Lauer, T. R.; Faber, S. M.; Groth, E. J.
  • The Astronomical Journal, Vol. 106
  • DOI: 10.1086/116737

The nuclear bulge of the Galaxy: III. Large-scale physical characteristics of stars and interstellar matter
journal, March 2002


Evidence for Unresolved γ -Ray Point Sources in the Inner Galaxy
journal, February 2016


Improved Estimates of the Milky Way’S Stellar mass and star Formation rate from Hierarchical Bayesian Meta-Analysis
journal, June 2015


High-energy tail of the Galactic Center gamma-ray excess
journal, November 2016


Binary and Millisecond Pulsars
journal, November 2005


The Parkes Southern Pulsar Survey -- II. Final results and population analysis
journal, April 1998


The Gaia -ESO Survey: radial distribution of abundances in the Galactic disc from open clusters and young-field stars
journal, June 2017


Dark matter versus pulsars: catching the impostor
journal, October 2013

  • Mirabal, N.
  • Monthly Notices of the Royal Astronomical Society, Vol. 436, Issue 3
  • DOI: 10.1093/mnras/stt1740

Eccentric‐Disk Models for the Nucleus of M31
journal, December 2003

  • Peiris, Hiranya V.; Tremaine, Scott
  • The Astrophysical Journal, Vol. 599, Issue 1
  • DOI: 10.1086/378638

Galactic Center gamma-ray ``excess'' from an active past of the Galactic Centre?
journal, October 2014

  • Petrović, Jovana; Serpico, Pasquale Dario; Zaharijaš, Gabrijela
  • Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 10
  • DOI: 10.1088/1475-7516/2014/10/052

Millisecond pulsars and the Galactic Center gamma-ray excess: the importance of luminosity function and secondary emission
journal, February 2015

  • Petrović, Jovana; Serpico, Pasquale D.; Zaharijas, Gabrijela
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 02
  • DOI: 10.1088/1475-7516/2015/02/023

First AGILE catalog of high-confidence gamma-ray sources
journal, September 2009


Consistency between the luminosity function of resolved millisecond pulsars and the galactic center excess
journal, August 2017

  • Ploeg, Harrison; Gordon, Chris; Crocker, Roland
  • Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 08
  • DOI: 10.1088/1475-7516/2017/08/015

Dynamical modelling of the galactic bulge and bar: the Milky Way's pattern speed, stellar and dark matter mass distribution
journal, November 2016

  • Portail, Matthieu; Gerhard, Ortwin; Wegg, Christopher
  • Monthly Notices of the Royal Astronomical Society, Vol. 465, Issue 2
  • DOI: 10.1093/mnras/stw2819

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

The Milky Way’s stellar disk: Mapping and modeling the Galactic disk
journal, May 2013


Surface brightness profile of the Milky Way’s nuclear star cluster
journal, June 2014


GIANT GAMMA-RAY BUBBLES FROM FERMI -LAT: ACTIVE GALACTIC NUCLEUS ACTIVITY OR BIPOLAR GALACTIC WIND?
journal, November 2010


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


Constraints on Cosmic-Ray Propagation Models from a Global Bayesian Analysis
journal, February 2011


Population synthesis of classical low-mass X-ray binaries in the Galactic Bulge
journal, June 2015


Cosmic-Ray Positrons from Millisecond Pulsars
journal, July 2015


The contribution of millisecond pulsars to the Galactic cosmic-ray lepton spectrum
journal, March 2015

  • Venter, Christo; Kopp, Andreas; Harding, Alice K.
  • Advances in Space Research, Vol. 55, Issue 5
  • DOI: 10.1016/j.asr.2014.12.022

The dynamical formation of LMXBs in dense stellar environments: globular clusters and the inner bulge of M31
journal, September 2007


Disk‐Bulge‐Halo Models for the Andromeda Galaxy
journal, May 2003

  • Widrow, Lawrence M.; Perrett, Kathryn M.; Suyu, Sherry H.
  • The Astrophysical Journal, Vol. 588, Issue 1
  • DOI: 10.1086/368410

ESTIMATING THE GeV EMISSION OF MILLISECOND PULSARS IN DWARF SPHEROIDAL GALAXIES
journal, November 2016

  • Winter, Miles; Zaharijas, Gabrijela; Bechtol, Keith
  • The Astrophysical Journal, Vol. 832, Issue 1
  • DOI: 10.3847/2041-8205/832/1/L6

Testing the Millisecond Pulsar Scenario of the Galactic Center Gamma-Ray Excess with very high Energy Gamma-Rays
journal, April 2015


Millisecond pulsar interpretation of the Galactic center gamma-ray excess
journal, September 2014


    Works referencing / citing this record:

    Search for γ -ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope
    journal, June 2019


    Bayesian model comparison and analysis of the Galactic disc population of gamma-ray millisecond pulsars
    journal, September 2018

    • Bartels, R. T.; Edwards, T. D. P.; Weniger, C.
    • Monthly Notices of the Royal Astronomical Society, Vol. 481, Issue 3
    • DOI: 10.1093/mnras/sty2529

      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.