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Search for Spectral Irregularities due to Photon–Axionlike-Particle Oscillations with the Fermi Large Area Telescope

M. Ajello et al. (The Fermi-LAT Collaboration)
Phys. Rev. Lett. 116, 161101 – Published 20 April 2016
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Abstract

We report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (ALPs) in the γ-ray spectrum of NGC 1275, the central galaxy of the Perseus cluster. Using 6 years of Fermi Large Area Telescope data, we find no evidence for ALPs and exclude couplings above 5×1012GeV1 for ALP masses 0.5ma5neV at 95% confidence. The limits are competitive with the sensitivity of planned laboratory experiments, and, together with other bounds, strongly constrain the possibility that ALPs can reduce the γ-ray opacity of the Universe.

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  • Received 27 November 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.161101

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsGravitation, Cosmology & Astrophysics

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Vol. 116, Iss. 16 — 22 April 2016

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