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Title: Prospects for detecting dark matter with GLAST in light of the WMAP haze

Abstract

Observations by the Wilkinson Microwave Anisotropy Probe (WMAP) experiment have identified an excess of microwave emission from the center of the Milky Way. It has previously been shown that this 'WMAP haze' could be synchrotron emission from relativistic electrons and positrons produced in the annihilations of dark matter particles. In particular, the intensity, spectrum, and angular distribution of the WMAP haze is consistent with an electroweak scale dark matter particle (such as a supersymmetric neutralino or Kaluza-Klein dark matter in models with universal extra dimensions) annihilating with a cross section on the order of {sigma}v{approx}3x10{sup -26} cm{sup 3}/s and distributed with a cusped halo profile. No further exotic astrophysical or annihilation boost factors are required. If dark matter annihilations are in fact responsible for the observed haze, then other annihilation products will also be produced, including gamma rays. In this article, we study the prospects for the GLAST satellite to detect gamma rays from dark matter annihilations in the Galactic Center region in this scenario. We find that by studying only the inner 0.1 deg. around the Galactic Center, GLAST will be able to detect dark matter annihilating to heavy quarks, gauge bosons, or tau leptons over astrophysical backgrounds withmore » 5{sigma} (3{sigma}) significance if they are lighter than approximately 320-500 GeV (500-750 GeV). If the angular window is broadened to study the dark matter halo profile's angular extension (while simultaneously reducing the astrophysical backgrounds), weakly interacting, massive particles (WIMPs) as heavy as several TeV can be identified by GLAST with high significance. Only if the dark matter particles annihilate mostly to electrons or muons will GLAST be unable to identify the gamma ray spectrum associated with the WMAP haze.« less

Authors:
 [1];  [2]; ;  [3]
  1. Fermi National Accelerator Laboratory, Theoretical Astrophysics, Batavia, Illinois 60510 (United States)
  2. HEP Division, Argonne National Laboratory, 9700 Cass Ave., Argonne, Illinois 60439 (United States)
  3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS51, Cambridge, Massachusetts 02138 (United States)
Publication Date:
OSTI Identifier:
21039099
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevD.77.043511; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; ANISOTROPY; B QUARKS; BOSONS; C QUARKS; CROSS SECTIONS; ELECTRONS; GAMMA DETECTION; GAMMA SPECTRA; GEV RANGE; KALUZA-KLEIN THEORY; MILKY WAY; MUONS; NONLUMINOUS MATTER; POSITRONS; RELATIVISTIC RANGE; SUPERSYMMETRY; T QUARKS; TAU PARTICLES; TEV RANGE

Citation Formats

Hooper, Dan, Zaharijas, Gabrijela, Finkbeiner, Douglas P, and Dobler, Gregory. Prospects for detecting dark matter with GLAST in light of the WMAP haze. United States: N. p., 2008. Web. doi:10.1103/PHYSREVD.77.043511.
Hooper, Dan, Zaharijas, Gabrijela, Finkbeiner, Douglas P, & Dobler, Gregory. Prospects for detecting dark matter with GLAST in light of the WMAP haze. United States. doi:10.1103/PHYSREVD.77.043511.
Hooper, Dan, Zaharijas, Gabrijela, Finkbeiner, Douglas P, and Dobler, Gregory. Fri . "Prospects for detecting dark matter with GLAST in light of the WMAP haze". United States. doi:10.1103/PHYSREVD.77.043511.
@article{osti_21039099,
title = {Prospects for detecting dark matter with GLAST in light of the WMAP haze},
author = {Hooper, Dan and Zaharijas, Gabrijela and Finkbeiner, Douglas P and Dobler, Gregory},
abstractNote = {Observations by the Wilkinson Microwave Anisotropy Probe (WMAP) experiment have identified an excess of microwave emission from the center of the Milky Way. It has previously been shown that this 'WMAP haze' could be synchrotron emission from relativistic electrons and positrons produced in the annihilations of dark matter particles. In particular, the intensity, spectrum, and angular distribution of the WMAP haze is consistent with an electroweak scale dark matter particle (such as a supersymmetric neutralino or Kaluza-Klein dark matter in models with universal extra dimensions) annihilating with a cross section on the order of {sigma}v{approx}3x10{sup -26} cm{sup 3}/s and distributed with a cusped halo profile. No further exotic astrophysical or annihilation boost factors are required. If dark matter annihilations are in fact responsible for the observed haze, then other annihilation products will also be produced, including gamma rays. In this article, we study the prospects for the GLAST satellite to detect gamma rays from dark matter annihilations in the Galactic Center region in this scenario. We find that by studying only the inner 0.1 deg. around the Galactic Center, GLAST will be able to detect dark matter annihilating to heavy quarks, gauge bosons, or tau leptons over astrophysical backgrounds with 5{sigma} (3{sigma}) significance if they are lighter than approximately 320-500 GeV (500-750 GeV). If the angular window is broadened to study the dark matter halo profile's angular extension (while simultaneously reducing the astrophysical backgrounds), weakly interacting, massive particles (WIMPs) as heavy as several TeV can be identified by GLAST with high significance. Only if the dark matter particles annihilate mostly to electrons or muons will GLAST be unable to identify the gamma ray spectrum associated with the WMAP haze.},
doi = {10.1103/PHYSREVD.77.043511},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 4,
volume = 77,
place = {United States},
year = {2008},
month = {2}
}