The sensitivity of Cherenkov telescopes to dark matter and astrophysical anisotropies in the diffuse gamma-ray background
2014 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 1, 049- p.Article in journal (Refereed) Published
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.
power spectrum, dark matter experiments, gamma ray experiments
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-102807DOI: 10.1088/1475-7516/2014/01/049ISI: 000331134400050OAI: oai:DiVA.org:su-102807DiVA: diva2:713317