Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations with the Fermi Large Area Telescope
Number of Authors: 102
2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 16, 161101Article in journal (Refereed) Published
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 6 years of Fermi Large Area Telescope data, we find no evidence for ALPs and exclude couplings above 5 x 10(-12) GeV-1 for ALP masses 0.5 less than or similar to m(a) less than or similar to 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.
Place, publisher, year, edition, pages
2016. Vol. 116, no 16, 161101
IdentifiersURN: urn:nbn:se:su:diva-130872DOI: 10.1103/PhysRevLett.116.161101ISI: 000374559300002PubMedID: 27152783OAI: oai:DiVA.org:su-130872DiVA: diva2:934708