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The sensitivity of Cherenkov telescopes to dark matter and astrophysical anisotropies in the diffuse gamma-ray background
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Max Planck Society, Germany .
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University of Turin, Italy.
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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2014 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 1, 049- p.Article in journal (Refereed) Published
Abstract [en]

In this article, the capability of present (H.E.S.S., MAGIC, VERITAS) and planned (CTA) ground-based Cherenkov telescope systems for detecting angular anisotropies in the diffuse gamma-ray background is investigated. Following up on a study of the impact of instrumental characteristics (effective area, field of view, angular resolution, and background rejection efficiency), the first part examines the influence of different observational strategies, i.e. whether a single deep observation or a splitting over multiple shallow fields is preferred. In the second part, the sensitivity to anisotropies generated by self-annihilating dark matter is studied for different common dark matter models. We find that a relative contribution of similar to 10% from dark matter annihilation to the extra-galactic diffuse gamma-ray background can be detected with planned configurations of CIA. In terms of the thermally-averaged self-annihilation cross section, the sensitivity of CTA corresponds to values below the thermal freeze-out expectation <sigma v > = 3 x 10(-26) cm(3) s(-1) for dark matter particles lighter than similar to 200 GeV. We stress the importance of constraining anisotropies from unresolved astrophysical sources with currently operating instruments already, as a novel and complementary method for investigating the properties of TeV sources.

Place, publisher, year, edition, pages
2014. no 1, 049- p.
Keyword [en]
power spectrum, dark matter experiments, gamma ray experiments
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-102807DOI: 10.1088/1475-7516/2014/01/049ISI: 000331134400050OAI: oai:DiVA.org:su-102807DiVA: diva2:713317
Note

AuthorCount:5;

Available from: 2014-04-22 Created: 2014-04-22 Last updated: 2017-12-05Bibliographically approved

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