The distribution of annihilation luminosities in dark matter substructure
Abstract
We calculate the probability distribution function (PDF) of the expected annihilation luminosities of dark matter subhalos as a function of subhalo mass and distance from the Galactic center using a semi-analytical model of halo evolution. We find that the PDF of luminosities is relatively broad, exhibiting a spread of as much as an order of magnitude at fixed subhalo mass and halo-centric distance. The luminosity PDF allows for simple construction of mock samples of gamma-ray luminous subhalos and assessment of the variance in among predicted gamma-ray signals from dark matter annihilation. Other applications include quantifying the variance among the expected luminosities of dwarf spheroidal galaxies, assessing the level at which dark matter annihilation can be a contaminant in the expected gamma-ray signal from other astrophysical sources, as well as estimating the level at which nearby subhalos can contribute to the antimatter flux.
Keywords
Cite
@article{arxiv.1006.2391,
title = {The distribution of annihilation luminosities in dark matter substructure},
author = {Savvas M. Koushiappas and Andrew R. Zentner and Andrey V. Kravtsov},
journal= {arXiv preprint arXiv:1006.2391},
year = {2014}
}
Comments
10 pages, 5 figures. Replaced with version accepted for publication in Phys. Rev. D