Search for Dark Matter Annihilation in Galaxy Groups
Name
PhysRevLett.120.101101.pdf
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298.97 KB
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Adobe PDF
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Author(s)
Lisanti, Mariangela
Mishra-Sharma, Siddharth
Rodd, Nicholas Llewellyn
Safdi, Benjamin Ryan
Date Issued
March 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lisanti, Mariangela et al. "Search for Dark Matter Annihilation in Galaxy Groups." Physical Review Letters 120, 10 (March 2018): 101101 © 2018 American Physical Society
Version
Final published version
Abstract
We use 413 weeks of publicly available Fermi Pass 8 gamma-ray data combined with recently developed galaxy group catalogs to search for evidence of dark matter annihilation in extragalactic halos. In our study, we use luminosity-based mass estimates and mass-to-concentration relations to infer the J factors and associated uncertainties for hundreds of galaxy groups within a redshift range z≲0.03. We employ a conservative substructure boost factor model, which only enhances the sensitivity by an O(1) factor. No significant evidence for dark matter annihilation is found, and we exclude thermal relic cross sections for dark matter masses below ∼30 GeV to 95% confidence in the bb[over ¯] annihilation channel. These bounds are comparable to those from Milky Way dwarf spheroidal satellite galaxies. The results of our analysis increase the tension but do not rule out the dark matter interpretation of the Galactic Center excess. We provide a catalog of the galaxy groups used in this study and their inferred properties, which can be broadly applied to searches for extragalactic dark matter.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.120.101101
