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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1503.06209 (astro-ph)
[Submitted on 20 Mar 2015]

Title:On The Gamma-Ray Emission From Reticulum II and Other Dwarf Galaxies

Authors:Dan Hooper, Tim Linden
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Abstract:The recent discovery of ten new dwarf galaxy candidates by the Dark Energy Survey (DES) and the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) could increase the Fermi Gamma-Ray Space Telescope's sensitivity to annihilating dark matter particles, potentially enabling a definitive test of the dark matter interpretation of the long-standing Galactic Center gamma-ray excess. In this paper, we compare the previous analyses of Fermi data from the directions of the new dwarf candidates (including the relatively nearby Reticulum II) and perform our own analysis, with the goal of establishing the statistical significance of any gamma-ray signal from these sources. We confirm the presence of an excess from Reticulum II, with a spectral shape that is compatible with the Galactic Center signal. The significance of this emission is greater than that observed from 99.84% of randomly chosen high-latitude blank-sky locations, corresponding to a local detection significance of 3.2 sigma. We improve upon the standard blank-sky calibration approach through the use of multi-wavelength catalogs, which allow us to avoid regions that are likely to contain unresolved gamma-ray sources.
Comments: 8 pages, 5 Figures
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Astrophysics of Galaxies (astro-ph.GA); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1503.06209 [astro-ph.HE]
  (or arXiv:1503.06209v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1503.06209
Related DOI: https://doi.org/10.1088/1475-7516/2015/09/016

Submission history

From: Tim Linden [view email]
[v1] Fri, 20 Mar 2015 19:55:22 UTC (434 KB)
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