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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. Furthermore, we also calculate the fraction of observable subhalos that are predicted to be spatially extended at a level potentially discernible to Fermi.

Authors:
 [1];  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1345636
Report Number(s):
FERMILAB-PUB-16-470-A; arXiv:1610.07587
Journal ID: ISSN 1475-7516; 1494044
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 04; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; dark matter experiments; dark matter simulations; dark matter theory; gamma ray experiments

Citation Formats

Hooper, Dan, and Witte, Samuel J. 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. 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. Tue . "Gamma rays from dark matter subhalos revisited: Refining the predictions and constraints". United States. doi:10.1088/1475-7516/2017/04/018. https://www.osti.gov/servlets/purl/1345636.
@article{osti_1345636,
title = {Gamma rays from dark matter subhalos revisited: Refining the predictions and constraints},
author = {Hooper, Dan and Witte, Samuel J.},
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. Furthermore, 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 = {Tue Apr 11 00:00:00 EDT 2017},
month = {Tue Apr 11 00:00:00 EDT 2017}
}

Journal Article:
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Cited by: 3 works
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