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

In this paper, 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 x 10-12 GeV-1 for ALP masses 0.5 ≲ ma ≲ 5 neV at 95% confidence. Finally, 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.
Authors:
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Publication Date:
Grant/Contract Number:
AC02-76SF00515; FIRB-2012-RBFR12PM1F
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 16; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stockholm Univ. (Sweden)
Sponsoring Org:
USDOE; National Aeronautics and Space Administration (NASA) (United States); Ministry of Education, University and Research (MIUR) (Italy)
Contributing Orgs:
The Fermi-LAT Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1355688
Alternate Identifier(s):
OSTI ID: 1355688