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.
Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations with the Fermi Large Area Telescope / Ajello M; Albert A; Anderson B; Baldini L; Barbiellini G; Bastieri D; Bellazzini R; Bissaldi E; Blandford RD; Bloom ED; Bonino R; Bottacini E; Bregeon J; Bruel P; Buehler R; Caliandro GA; Cameron RA; Caragiulo M; Caraveo PA; Cecchi C; Chekhtman A; Ciprini S; Cohen-Tanugi J; Conrad J; Costanza F; DAmmando F; de Angelis A; de Palma F; Desiante R; Di Mauro M; Di Venere L; Dominguez A; Drell PS; Favuzzi C; Focke WB; Franckowiak A; Fukazawa Y; Funk S; Fusco P; Gargano F; Gasparrini D; Giglietto N; Glanzman T; Godfrey G; Guiriec S; Horan D; Johannesson G; Katsuragawa M; Kensei S; Kuss M; Larsson S; Latronico L; Li J; Li L; Longo F; Loparco F; Lubrano P; Madejski GM; Maldera S; Manfreda A; Mayer M; Mazziotta MN; Meyer M; Michelson PF; Mirabal N; Mizuno T; Monzani ME; Morselli A; Moskalenko IV; Murgia S; Negro M; Nuss E; Okada C; Orlando E; Ormes JF; Paneque D; Perkins JS; Pesce-Rollins M; Piron F; Pivato G; Porter TA; Raino S; Rando R; Razzano M; Reimer A; Sanchez-Conde M; Sgro C; Simone D; Siskind EJ; Spada F; Spandre G; Spinelli P; Takahashi H; Thayer JB; Torres DF; Tosti G; Troja E; Uchiyama Y; Wood KS; Wood M; Zaharijas G; Zimmer S. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 116:16(2016), pp. 161101.1-161101.7. [10.1103/PhysRevLett.116.161101]
Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations with the Fermi Large Area Telescope
D'AMMANDO, FILIPPO;
2016
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 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
