Prospects for measuring dark matter microphysics with observations of dwarf spheroidal galaxies

Baxter, Eric J.; Kumar, Jason; Pace, Andrew B.; Runburg, Jack

doi:10.1088/1475-7516/2021/07/030

Title: Prospects for measuring dark matter microphysics with observations of dwarf spheroidal galaxies

Journal Article · Thu Jul 15 00:00:00 EDT 2021 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2021/07/030· OSTI ID:1851387

Baxter, Eric J. ^[1]; Kumar, Jason ^[1]; Pace, Andrew B. ^[2]; Runburg, Jack ^[1]

University of Hawaii, Honolulu, HI (United States)
Carnegie Mellon University, Pittsburgh, PA (United States)

Dark matter annihilation in dwarf spheroidal (dSph) galaxies near the Milky Way has the potential to produce a detectable signature in gamma-rays. The amplitude of this signal depends on the dark matter density in a dSph, the dark matter particle mass, the number of photons produced in an annihilation, and the possibly velocity-dependent dark matter annihilation cross section. We argue that if the amplitude of the annihilation signal from multiple dSphs can be measured, it is possible to determine the velocity-dependence of the annihilation cross section. However, we show that doing so will require improved constraints on the dSph density profiles, including control of possible sources of systematic uncertainty. Making reasonable assumptions about future improvements, we make forecasts for the ability of current and future experiments — including Fermi, CTA and AMEGO — to constrain the dark matter annihilation velocity dependence.

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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-1813881; AST-1934744

OSTI ID:: 1851387

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 07; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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