Résumé
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 5×10-12 GeV-1 for ALP masses 0.5ma5 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 γ-ray opacity of the Universe.
| langue originale | Anglais |
|---|---|
| Numéro d'article | 161101 |
| journal | Physical Review Letters |
| Volume | 116 |
| Numéro de publication | 16 |
| Les DOIs | |
| état | Publié - 20 avr. 2016 |
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