skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Gamma rays from dark matter subhalos revisited: refining the predictions and constraints

Abstract

Utilizing data from the ELVIS and Via Lactea-II simulations, we characterize the local dark matter subhalo population, and use this information to refine the predictions for the gamma-ray fluxes arising from annihilating dark matter in this class of objects. We find that the shapes of nearby subhalos are significantly altered by tidal effects, and are generally not well described by NFW density profiles, instead prefering power-law profiles with an exponential cutoff. From the subhalo candidates detected by the Fermi Gamma-Ray Space Telescope, we place limits on the dark matter annihilation cross section that are only modestly weaker than those based on observations of dwarf galaxies. We also calculate the fraction of observable subhalos that are predicted to be spatially extended at a level potentially discernible to Fermi.

Authors:
;  [1]
  1. Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Kirk Road and Pine Street, Batavia, IL 60510 (United States)
Publication Date:
OSTI Identifier:
22679921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; COMPUTERIZED SIMULATION; CROSS SECTIONS; DENSITY; GALAXIES; GAMMA RADIATION; NONLUMINOUS MATTER; SPACE; TELESCOPES

Citation Formats

Hooper, Dan, and Witte, Samuel J., E-mail: dhooper@fnal.gov, E-mail: switte@physics.ucla.edu. Gamma rays from dark matter subhalos revisited: refining the predictions and constraints. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/04/018.
Hooper, Dan, & Witte, Samuel J., E-mail: dhooper@fnal.gov, E-mail: switte@physics.ucla.edu. Gamma rays from dark matter subhalos revisited: refining the predictions and constraints. United States. doi:10.1088/1475-7516/2017/04/018.
Hooper, Dan, and Witte, Samuel J., E-mail: dhooper@fnal.gov, E-mail: switte@physics.ucla.edu. Sat . "Gamma rays from dark matter subhalos revisited: refining the predictions and constraints". United States. doi:10.1088/1475-7516/2017/04/018.
@article{osti_22679921,
title = {Gamma rays from dark matter subhalos revisited: refining the predictions and constraints},
author = {Hooper, Dan and Witte, Samuel J., E-mail: dhooper@fnal.gov, E-mail: switte@physics.ucla.edu},
abstractNote = {Utilizing data from the ELVIS and Via Lactea-II simulations, we characterize the local dark matter subhalo population, and use this information to refine the predictions for the gamma-ray fluxes arising from annihilating dark matter in this class of objects. We find that the shapes of nearby subhalos are significantly altered by tidal effects, and are generally not well described by NFW density profiles, instead prefering power-law profiles with an exponential cutoff. From the subhalo candidates detected by the Fermi Gamma-Ray Space Telescope, we place limits on the dark matter annihilation cross section that are only modestly weaker than those based on observations of dwarf galaxies. We also calculate the fraction of observable subhalos that are predicted to be spatially extended at a level potentially discernible to Fermi.},
doi = {10.1088/1475-7516/2017/04/018},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2017,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}