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

Abstract

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.

Authors:
 [1];  [2]; ORCiD logo [2];  [3]
  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)
Publication Date:
Research Org.:
Univ. of Hawaii, Honolulu, HI (United States). High Energy Physics Group
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1598682
Alternate Identifier(s):
OSTI ID: 1780925
Grant/Contract Number:  
SC0010504
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 6; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Boddy, Kimberly K., Kumar, Jason, Runburg, Jack, and Strigari, Louis E. Angular distribution of gamma-ray emission from velocity-dependent dark matter annihilation in subhalos. United States: N. p., 2019. Web. https://doi.org/10.1103/PhysRevD.100.063019.
Boddy, Kimberly K., Kumar, Jason, Runburg, Jack, & Strigari, Louis E. Angular distribution of gamma-ray emission from velocity-dependent dark matter annihilation in subhalos. United States. https://doi.org/10.1103/PhysRevD.100.063019
Boddy, Kimberly K., Kumar, Jason, Runburg, Jack, and Strigari, Louis E. Mon . "Angular distribution of gamma-ray emission from velocity-dependent dark matter annihilation in subhalos". United States. https://doi.org/10.1103/PhysRevD.100.063019. https://www.osti.gov/servlets/purl/1598682.
@article{osti_1598682,
title = {Angular distribution of gamma-ray emission from velocity-dependent dark matter annihilation in subhalos},
author = {Boddy, Kimberly K. and Kumar, Jason and Runburg, Jack and Strigari, Louis E.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.100.063019},
journal = {Physical Review D},
number = 6,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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