Search for dark matter annihilation in the Milky&nbsp;Way halo

Chang, Laura J.; Lisanti, Mariangela; Mishra-Sharma, Siddharth

doi:10.1103/physrevd.98.123004

Search for dark matter annihilation in the Milky Way halo

Journal Article · Tue Dec 11 00:00:00 EST 2018 · Physical Review D

DOI:https://doi.org/10.1103/physrevd.98.123004· OSTI ID:1611000

Chang, Laura J. ^[1]; Lisanti, Mariangela ^[2]; Mishra-Sharma, Siddharth ^[2]

Princeton Univ., NJ (United States); DOE/OSTI
Princeton Univ., NJ (United States)

The Milky Way halo is the brightest source of dark matter annihilation in the sky. Indeed, the potential strength of the Galactic dark matter signal can supersede that expected from dwarf galaxies and galaxy groups even in regions away from the inner galaxy. In this paper, we present the results of a search for dark matter annihilation in the smooth Milky Way halo for |b| > 20° and r < 50° using 413 weeks of Fermi Pass 8 data within the energy range of ~0.8–50 GeV. We exclude thermal dark matter with mass below ~70 GeV that annihilates to bb¯ at the 95% confidence level using the p6v11 cosmic-ray foreground model, providing the strongest limits on the annihilation cross section in this mass range. These results exclude the region of dark matter parameter space that is consistent with the excess of ~GeV photons observed at the Galactic center for the bb¯ annihilation channel and, for the first time, start probing the τ+τ^– explanation. As a result, we explore how these results depend on uncertainties in the foregrounds by varying over a set of reasonable models.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0007968

OSTI ID:: 1611000

Alternate ID(s):: OSTI ID: 1485350

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 12 Vol. 98; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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