The sensitivity of Cherenkov telescopes to dark matter and astrophysical anisotropies in the diffuse gamma-ray backgroundVisa övriga samt affilieringar
2014 (Engelska)Ingår i: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, nr 1, artikel-id 049Artikel i tidskrift (Refereegranskat) 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.
Ort, förlag, år, upplaga, sidor
2014. nr 1, artikel-id 049
Nyckelord [en]
power spectrum, dark matter experiments, gamma ray experiments
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:su:diva-102807DOI: 10.1088/1475-7516/2014/01/049ISI: 000331134400050Scopus ID: 2-s2.0-84893504266OAI: oai:DiVA.org:su-102807DiVA, id: diva2:713317
Anmärkning
AuthorCount:5;
2014-04-222014-04-222023-03-28Bibliografiskt granskad