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https://hdl.handle.net/2440/69077
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Type: | Journal article |
Title: | HESS constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies |
Author: | Maxted, N. Nicholas, B. Rowell, G. |
Citation: | Astroparticle Physics, 2011; 34(8):608-616 |
Publisher: | Elsevier Science BV |
Issue Date: | 2011 |
ISSN: | 0927-6505 |
Organisation: | H.E.S.S. Collaboration |
Statement of Responsibility: | A. Abramowski... N. Maxted... G. Rowell... et al. |
Abstract: | The Sculptor and Carina dwarf spheroidal galaxies were observed with the H.E.S.S. Cherenkov telescope array between January 2008 and December 2009. The data sets consist of a total of 11.8 h and 14.8 h of high quality data, respectively. No gamma-ray signal was detected at the nominal positions of these galaxies above 220 GeV and 320 GeV, respectively. Upper limits on the gamma-ray fluxes at 95% CL assuming two forms for the spectral energy distribution (a power law shape and one derived from dark matter annihilation) are obtained at the level of 10-13-10-12 cm-2 s-1 in the TeV range. Constraints on the velocity weighted dark matter particle annihilation cross section for both Sculptor and Carina dwarf galaxies range from 〈σv〉 ∼ 10-21 cm3 s-1 down to 〈σv〉 ∼ 10-22 cm3 s -1 depending on the dark matter halo model used. Possible enhancements of the gamma-ray flux are studied: the Sommerfeld effect, which is found to exclude some dark matter particle masses, the internal Bremsstrahlung and clumps in the dark-matter halo distributions. © 2011 Published by Elsevier B.V. |
Keywords: | Gamma-rays: observations – Dwarf spheroidal galaxy Dark matter Sculptor Carina Sommerfeld enhancement Internal Bremsstrahlung |
Rights: | Copyright 2010 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.astropartphys.2010.12.006 |
Published version: | http://dx.doi.org/10.1016/j.astropartphys.2010.12.006 |
Appears in Collections: | Aurora harvest 5 IPAS publications |
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