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On detecting oscillations of gamma rays into axion-like particles in turbulent and coherent magnetic fields
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).ORCID-id: 0000-0002-0738-7581
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
2014 (engelsk)Inngår i: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, nr 9, s. 003-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Background radiation fields pervade the Universe, and above a certain energy any gamma-ray flux emitted by an extragalactic source should be attenuated due to e(+)e(-) pair production. The opacity could be alleviated if photons oscillated into hypothetical axion-like particles (ALPs) in ambient magnetic fields, leading to a gamma-ray excess especially at high optical depths that could be detected with imaging air Cherenkov telescopes (IACTs). Here, we introduce a method to search for such a signal in gamma-ray data and to estimate sensitivities for future observations. Different magnetic fields close to the gamma-ray source are taken into account in which photons can convert into ALPs that then propagate unimpeded over cosmological distances until they re-convert in the magnetic field of the Milky Way. Specifically, we consider the coherent field at parsec scales in a blazar jet as well as the turbulent field inside a galaxy cluster. For the latter, we explicitly derive the transversal components of a magnetic field with gaussian turbulence which are responsible for the photonALP mixing. To illustrate the method, we apply it to a mock TACT array with characteristics similar to the Cherekov Telescope Array and investigate the dependence of the sensitivity to detect a gamma-ray excess on the magnetic-field parameters.

sted, utgiver, år, opplag, sider
2014. nr 9, s. 003-
Emneord [en]
gamma ray experiments, active galactic nuclei, magnetic fields, galaxy clusters
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-108727DOI: 10.1088/1475-7516/2014/09/003ISI: 000342642500004OAI: oai:DiVA.org:su-108727DiVA, id: diva2:760643
Merknad

AuthorCount:3;

Tilgjengelig fra: 2014-11-04 Laget: 2014-11-03 Sist oppdatert: 2019-12-09bibliografisk kontrollert

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