Angular distribution of gamma-ray emission from velocity-dependent dark matter annihilation in subhalos

Journal Article · 30 September 2019 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.100.063019 · OSTI ID:1598682

Boddy, Kimberly K. ^[1]; Kumar, Jason ^[2]; Runburg, Jack  ^[2]; Strigari, Louis E. ^[3]

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1. Johns Hopkins Univ., Baltimore, MD (United States)
2. Univ. of Hawaii, Honolulu, HI (United States)
3. Texas A & M Univ., College Station, TX (United States)

We consider the effect of velocity-dependent dark matter annihilation on the angular distribution of gamma rays produced in dark matter subhalos. We assume that the dark matter potential is spherically symmetric, characterized by a scale radius and scale density, and the velocity distribution is isotropic. We find that the effect of velocity-dependent dark matter annihilation is largely determined by dimensional analysis; the angular size of gamma-ray emission from an individual subhalo is rescaled by a factor which depends on the form of the dark matter distribution, but not on the halo parameters, while the relative normalization of the gamma-ray flux from different mass subhalos is rescaled by a factor which depends on the halo parameters, but not on the form of the dark matter distribution. We apply our results to a Navarro-Frenk-White profile for the case of an individual subhalo and comment on the application of these results to a distribution of subhalos.

• Research Organization: Univ. of Hawaii, Honolulu, HI (United States). High Energy Physics Group
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: SC0010504
• OSTI ID: 1598682
• Alternate ID(s): OSTI ID: 1780925
• Journal Information: Physical Review D, Vol. 100, Issue 6; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English