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Title: Searching For Dark Matter Annihilation In The Smith High-Velocity Cloud

Recent observations suggest that some high-velocity clouds may be confined by massive dark matter halos. In particular, the proximity and proposed dark matter content of the Smith Cloud make it a tempting target for the indirect detection of dark matter annihilation. We argue that the Smith Cloud may be a better target than some Milky Way dwarf spheroidal satellite galaxies and use γ-ray observations from the Fermi Large Area Telescope to search for a dark matter annihilation signal. No significant γ-ray excess is found coincident with the Smith Cloud, and we set strong limits on the dark matter annihilation cross section assuming a spatially extended dark matter profile consistent with dynamical modeling of the Smith Cloud. Notably, these limits exclude the canonical thermal relic cross section (~3 × 10 -26 cm3 s -1) for dark matter masses . 30 GeV annihilating via the b¯b or τ⁺τ⁻ channels for certain assumptions of the dark matter density profile; however, uncertainties in the dark matter content of the Smith Cloud may significantly weaken these constraints.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Pontificia Univ. Catolica de Chile, Santiago (Chile); Inst. Nazionale di Fisica Nucleare, Rome (Italy)
  3. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  4. Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 790; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Gamma Rays
OSTI Identifier:
1356466

Drlica-Wagner, Alex, Gómez-Vargas, Germán A., Hewitt, John W., Linden, Tim, and Tibaldo, Luigi. Searching For Dark Matter Annihilation In The Smith High-Velocity Cloud. United States: N. p., Web. doi:10.1088/0004-637X/790/1/24.
Drlica-Wagner, Alex, Gómez-Vargas, Germán A., Hewitt, John W., Linden, Tim, & Tibaldo, Luigi. Searching For Dark Matter Annihilation In The Smith High-Velocity Cloud. United States. doi:10.1088/0004-637X/790/1/24.
Drlica-Wagner, Alex, Gómez-Vargas, Germán A., Hewitt, John W., Linden, Tim, and Tibaldo, Luigi. 2014. "Searching For Dark Matter Annihilation In The Smith High-Velocity Cloud". United States. doi:10.1088/0004-637X/790/1/24. https://www.osti.gov/servlets/purl/1356466.
@article{osti_1356466,
title = {Searching For Dark Matter Annihilation In The Smith High-Velocity Cloud},
author = {Drlica-Wagner, Alex and Gómez-Vargas, Germán A. and Hewitt, John W. and Linden, Tim and Tibaldo, Luigi},
abstractNote = {Recent observations suggest that some high-velocity clouds may be confined by massive dark matter halos. In particular, the proximity and proposed dark matter content of the Smith Cloud make it a tempting target for the indirect detection of dark matter annihilation. We argue that the Smith Cloud may be a better target than some Milky Way dwarf spheroidal satellite galaxies and use γ-ray observations from the Fermi Large Area Telescope to search for a dark matter annihilation signal. No significant γ-ray excess is found coincident with the Smith Cloud, and we set strong limits on the dark matter annihilation cross section assuming a spatially extended dark matter profile consistent with dynamical modeling of the Smith Cloud. Notably, these limits exclude the canonical thermal relic cross section (~3 × 10-26 cm3 s-1) for dark matter masses . 30 GeV annihilating via the b¯b or τ⁺τ⁻ channels for certain assumptions of the dark matter density profile; however, uncertainties in the dark matter content of the Smith Cloud may significantly weaken these constraints.},
doi = {10.1088/0004-637X/790/1/24},
journal = {Astrophysical Journal},
number = 1,
volume = 790,
place = {United States},
year = {2014},
month = {6}
}