| タイトル | Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations with the Fermi Large Area Telescope |
| 著者（英） | Albert, A.; Barbiellini, G.; Troja, E.; Anderson, B.; Perkins, J. S.; Ajello, M.; Bellazzini, R.; Baldini, L.; Mirabal, N.; Guiriec, S.; Bastieri, D.; Bissaldi, E.; Blandford, R.D. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2016-04-20 |
| 言語 | eng |
| 内容記述 | We report on the search for spectral irregularities induced by oscillations between photons and axion-like 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 times 10 (sup -12) per gigaelectronvolt for ALP masses less than or approximately equal to 0.5 apparent magnitude (m (sub a)) less than or approximately equal to 5 nanoelectronvolts at 95 percent confidence. The limits are competitive withthe sensitivity of planned laboratory experiments, and, together with other bounds, strongly constrain thepossibility that ALPs can reduce the gamma-ray opacity of the Universe. |
| NASA分類 | Astrophysics |
| レポートNO | GSFC-E-DAA-TN41799 |
| 権利 | Copyright |
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