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Title: Search for γ -ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope

Abstract

The Andromeda (M31) and Triangulum (M33) galaxies are the closest Local Group galaxies to the Milky Way, being only 785 and 870 kpc away. These two galaxies provide an independent view of high-energy processes that are often obscured in our own Galaxy, including possible signals of dark matter (DM) particle interactions. The Fermi Large Area Telescope (Fermi-LAT) preliminary eight year list of sources includes both M31, which is detected as extended with a size of about 0.4°, and M33, which is detected as a pointlike source. The spatial morphology of M31 γ-ray emission could trace a population of unresolved sources and energetic particles originating in sources not related to massive star formation. Alternatively, the γ-ray emission could also be an indication of annihilation or decay of DM particles. We investigate these two possibilities using almost 10 years of data from the Fermi-LAT. An interpretation that involves only a DM γ-ray emission is in tension with the current limits from other searches, such as those targeting Milky Way dwarf spheroidal galaxies. When we include a template of astrophysical emission, tuned on γ-ray data or from observations of these galaxies in other wavelengths, we do not find any significant evidence for amore » DM contribution and we set limits for the annihilation cross section that probe the thermal cross section for DM masses up to a few tens of GeV in the b¯b and τ+τ– channels. For models where the DM substructures have masses above 10–6 solar masses our limits probe the DM interpretation of the Fermi-LAT Galactic center excess. In conclusion, we provide also the lower limit for the DM lifetime assuming the same spatial models of the DM distribution in M31 and M33.« less

Authors:
 [1];  [2];  [3];  [3];  [4]
+ Show Author Affiliations
  1. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Catholic Univ. of America, Washington, D.C. (United States)
  2. Chinese Academy of Sciences, Kunming (People's Republic of China); Chinese Academy of Sciences (CAS), Beijing (China)
  3. Univ. of Nova Gorica, Nova Gorica (Slovenia)
  4. Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1546729
Alternate Identifier(s):
OSTI ID: 1546265
Grant/Contract Number:  
AC02-76SF00515; 11503078; 11661161010; 11673060
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. D.
Additional Journal Information:
Journal Volume: 99; Journal Issue: 12; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Di Mauro, Mattia, Hou, Xian, Eckner, Christopher, Zaharijas, Gabrijela, and Charles, Eric. Search for γ-ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope. United States: N. p., 2019. Web. doi:10.1103/physrevd.99.123027.
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Di Mauro, Mattia, Hou, Xian, Eckner, Christopher, Zaharijas, Gabrijela, & Charles, Eric. Search for γ-ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope. United States. https://doi.org/10.1103/physrevd.99.123027
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Di Mauro, Mattia, Hou, Xian, Eckner, Christopher, Zaharijas, Gabrijela, and Charles, Eric. Sat . "Search for γ-ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope". United States. https://doi.org/10.1103/physrevd.99.123027. https://www.osti.gov/servlets/purl/1546729.
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@article{osti_1546729,
title = {Search for γ-ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope},
author = {Di Mauro, Mattia and Hou, Xian and Eckner, Christopher and Zaharijas, Gabrijela and Charles, Eric},
abstractNote = {The Andromeda (M31) and Triangulum (M33) galaxies are the closest Local Group galaxies to the Milky Way, being only 785 and 870 kpc away. These two galaxies provide an independent view of high-energy processes that are often obscured in our own Galaxy, including possible signals of dark matter (DM) particle interactions. The Fermi Large Area Telescope (Fermi-LAT) preliminary eight year list of sources includes both M31, which is detected as extended with a size of about 0.4°, and M33, which is detected as a pointlike source. The spatial morphology of M31 γ-ray emission could trace a population of unresolved sources and energetic particles originating in sources not related to massive star formation. Alternatively, the γ-ray emission could also be an indication of annihilation or decay of DM particles. We investigate these two possibilities using almost 10 years of data from the Fermi-LAT. An interpretation that involves only a DM γ-ray emission is in tension with the current limits from other searches, such as those targeting Milky Way dwarf spheroidal galaxies. When we include a template of astrophysical emission, tuned on γ-ray data or from observations of these galaxies in other wavelengths, we do not find any significant evidence for a DM contribution and we set limits for the annihilation cross section that probe the thermal cross section for DM masses up to a few tens of GeV in the b¯b and τ+τ– channels. For models where the DM substructures have masses above 10–6 solar masses our limits probe the DM interpretation of the Fermi-LAT Galactic center excess. In conclusion, we provide also the lower limit for the DM lifetime assuming the same spatial models of the DM distribution in M31 and M33.},
doi = {10.1103/physrevd.99.123027},
journal = {Physical Review. D.},
number = 12,
volume = 99,
place = {United States},
year = {Sat Jun 15 00:00:00 EDT 2019},
month = {Sat Jun 15 00:00:00 EDT 2019}
}
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https://doi.org/10.1103/physrevd.99.123027
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The dependence of dark matter profiles on the stellar to halo mass ratio: a prediction for cusps vs cores
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