Searching for velocity-dependent dark matter annihilation signals from extragalactic halos

Baxter, Eric J.; Kumar, Jason; Paul, Aleczander D.; Runburg, Jack

doi:10.1088/1475-7516/2022/09/026

Title: Searching for velocity-dependent dark matter annihilation signals from extragalactic halos

Journal Article · Thu Sep 01 00:00:00 EDT 2022 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2022/09/026· OSTI ID:1979371

Baxter, Eric J. ^[1]; Kumar, Jason ^[1]; Paul, Aleczander D. ^[1]; Runburg, Jack ^[1]

University of Hawaii, Honolulu, HI (United States)

We consider gamma-ray signals of dark matter annihilation in extragalactic halos in the case where dark matter annihilates from a p-wave or d-wave state. In these scenarios, signals from extragalactic halos are enhanced relative to other targets, such as the Galactic Center or dwarf spheroidal galaxies, because the typical relative speed of the dark matter is larger in extragalactic halos. We perform a mock data analysis of gamma rays produced by dark matter annihilation in halos detected by the Sloan Digital Sky Survey. We include a model for uncorrelated galactic and extragalactic gamma ray backgrounds, as well as a simple model for backgrounds due to astrophysical processes in the extragalactic halos detected by the survey. We find that, for models which are still allowed by other gamma ray searches, searches of extragalactic halos with the current Fermi exposure can produce evidence for dark matter annihilation, though it is difficult to distinguish the p-wave and d-wave scenarios. With a factor 10x larger exposure, though, discrimination of the velocity-dependence is possible.

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Research Organization:: Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0010504; AST-1934744

OSTI ID:: 1979371

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2022, Issue 09; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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