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Search for Dark Matter Annihilation in Galaxy Groups. | LitMetric

Search for Dark Matter Annihilation in Galaxy Groups.

Phys Rev Lett

Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Published: March 2018

AI Article Synopsis

  • The study analyzes 413 weeks of Fermi Pass 8 gamma-ray data alongside galaxy group catalogs to investigate potential dark matter annihilation in galaxy halos.
  • Using luminosity-based mass estimates and a model to account for uncertainties, no significant evidence of dark matter annihilation was found, resulting in exclusions of certain dark matter masses below ~30 GeV.
  • The research contributes to existing knowledge by providing a catalog of galaxy groups that can aid in future dark matter investigations while still leaving open questions regarding the mysterious Galactic Center excess.

Article 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.

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Source
http://dx.doi.org/10.1103/PhysRevLett.120.101101DOI Listing

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