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https://hdl.handle.net/2440/69077
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dc.contributor.author | Maxted, N. | - |
dc.contributor.author | Nicholas, B. | - |
dc.contributor.author | Rowell, G. | - |
dc.date.issued | 2011 | - |
dc.identifier.citation | Astroparticle Physics, 2011; 34(8):608-616 | - |
dc.identifier.issn | 0927-6505 | - |
dc.identifier.uri | http://hdl.handle.net/2440/69077 | - |
dc.description.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. | - |
dc.description.statementofresponsibility | A. Abramowski... N. Maxted... G. Rowell... et al. | - |
dc.language.iso | en | - |
dc.publisher | Elsevier Science BV | - |
dc.rights | Copyright 2010 Elsevier B.V. All rights reserved. | - |
dc.source.uri | http://dx.doi.org/10.1016/j.astropartphys.2010.12.006 | - |
dc.subject | Gamma-rays: observations – Dwarf | - |
dc.subject | spheroidal galaxy | - |
dc.subject | Dark matter | - |
dc.subject | Sculptor | - |
dc.subject | Carina | - |
dc.subject | Sommerfeld enhancement | - |
dc.subject | Internal Bremsstrahlung | - |
dc.title | HESS constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies | - |
dc.type | Journal article | - |
dc.contributor.organisation | H.E.S.S. Collaboration | - |
dc.identifier.doi | 10.1016/j.astropartphys.2010.12.006 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Rowell, G. [0000-0002-9516-1581] | - |
Appears in Collections: | Aurora harvest 5 IPAS publications |
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