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

Journal Article · · The Astrophysical Journal (Online)

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; DESC0014431; PHY-1620638; NNX17AB48G
OSTI ID:
1560649
Journal Information:
The Astrophysical Journal (Online), Vol. 880, Issue 2; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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The shapes, orientation, and alignment of Galactic dark matter subhalos text January 2007
Chandra detection of diffuse hot gas in and around the M31 bulge text January 2007
Globular clusters in the outer halo of M31: the survey text January 2008
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The properties of warm dark matter haloes text January 2013
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ETHOS - An Effective Theory of Structure Formation: From dark particle physics to the matter distribution of the Universe text January 2015
Bayesian analysis of cosmic-ray propagation: evidence against homogeneous diffusion text January 2016
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Major Substructure in the M31 Outer Halo: Distances and Metallicities along the Giant Stellar Stream text January 2016
Evidence of Fermi bubbles around M31 text January 2016
A review of indirect searches for particle dark matter text January 2016
Project AMIGA: A Minimal Covering Factor for Optically Thick Circumgalactic Gas Around the Andromeda Galaxy text January 2017
High-Energy Gamma Rays from the Milky Way: Three-Dimensional Spatial Models for the Cosmic-Ray and Radiation Field Densities in the Interstellar Medium text January 2017
Mapping Extragalactic Dark Matter Annihilation with Galaxy Surveys: A Systematic Study of Stacked Group Searches text January 2017
HelMod in the works: from direct observations to the local interstellar spectrum of cosmic-ray electrons text January 2018
Deciphering the local Interstellar spectra of primary cosmic ray species with HelMod text January 2018
A Robust Excess in the Cosmic-Ray Antiproton Spectrum: Implications for Annihilating Dark Matter text January 2019
An all-sky study of compact, isolated high-velocity clouds text January 2002
The WSRT wide-field HI survey: II. Local Group features text January 2003
Revisiting the radial distribution of pulsars in the Galaxy text January 2004
The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections text January 2005
On the accretion origin of a vast extended stellar disk around the Andromeda galaxy text January 2005
Extended HI Rotation Curve and Mass Distribution of M31 text January 2006
Mapping and Mass Measurement of the Cold Dust in NGC 205 with Spitzer text January 2006
Probing the Nature of the G1 Clump Stellar Overdensity in the Outskirts of M31 text January 2006
Large Scale Structure Tests of Warm Dark Matter text January 1995
Diffuse continuum gamma rays from the Galaxy text January 1998
Galactic Halo Models and Particle Dark-Matter Detection text January 1997

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