Velocity-dependent J-factors for annihilation radiation from cosmological simulations

Board, Erin; Bozorgnia, Nassim; Strigari, Louis E.; Grand, Robert J. J.; Fattahi, Azadeh; Frenk, Carlos S.; Marinacci, Federico; Navarro, Julio F.; Oman, Kyle A.

doi:10.1088/1475-7516/2021/04/070

Velocity-dependent J-factors for annihilation radiation from cosmological simulations

Journal Article · 01 April 2021 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2021/04/070· OSTI ID:1851445

Board, Erin ^[1]; Bozorgnia, Nassim; Strigari, Louis E.; Grand, Robert J. J.; Fattahi, Azadeh; Frenk, Carlos S.; Marinacci, Federico; Navarro, Julio F.; Oman, Kyle A.

OSTI

Abstract

We determine the dark matter pair-wise relative velocity distribution in a set of Milky Way-like halos in the Auriga and APOSTLE simulations. Focusing on the smooth halo component, the relative velocity distribution is well-described by a Maxwell-Boltzmann distribution over nearly all radii in the halo. We explore the implications for velocity-dependent dark matter annihilation, focusing on four models which scale as different powers of the relative velocity: Sommerfeld, s-wave, p-wave, and d-wave models. We show that the J-factors scale as the moments of the relative velocity distribution, and that the halo-to-halo scatter is largest for d-wave, and smallest for Sommerfeld models. The J-factor is strongly correlated with the dark matter density in the halo, and is very weakly correlated with the velocity dispersion. This implies that if the dark matter density in the Milky Way can be robustly determined, one can accurately predict the dark matter annihilation signal, without the need to identify the dark matter velocity distribution in the Galaxy.

Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0010813;

OSTI ID:: 1851445

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2021; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)

Country of Publication:: United States

Language:: English

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