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

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          Abstract

          We report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (ALPs) in the \(\gamma\)-ray spectrum of NGC 1275, the central galaxy of the Perseus cluster. Using six years of Fermi Large Area Telescope data, we find no evidence for ALPs and exclude couplings above \(5\times10^{-12}\,\mathrm{GeV}^{-1}\) for ALP masses \(0.5 \lesssim m_a \lesssim 5\) neV 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 \(\gamma\)-ray opacity of the Universe.

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          Author and article information

          Journal
          2016-03-22
          2016-04-21
          Article
          10.1103/PhysRevLett.116.161101
          1603.06978

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          Custom metadata
          Phys. Rev. Lett. 116, 161101 (2016)
          Accepted by PRL. Includes Supplemental Material. 8+10 pages, 2+7 figures, 1+2 tables. References updated. Matches published version. Corresponding Authors: Manuel Meyer, Jan Conrad, Miguel Sanchez-Conde
          astro-ph.HE hep-ph

          High energy & Particle physics, High energy astrophysical phenomena

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