Observations of occultations of bright. gamma-ray sources by the Sun may reveal predicted pair halos around blazars and/or new physics, such as, e.g., hypothetical light dark matter particles-axions. We use Fermi Gamma-Ray Space Telescope (Fermi) data to analyze four occultations of blazar 3C 279 by the Sun on October 8 each year from 2008 to 2011. A combined analysis of the observations of these occultations allows a point-like source at the position of 3C 279 to be detected with significance of approximate to 3 sigma, but does not reveal any significant excess over the flux expected from the quiescent Sun. The likelihood ratio test rules out complete transparency of the Sun to the blazar. gamma-ray emission at a 3s confidence level.
Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN / Barbiellini G; Bastieri D; Bechtol K; Bellazzini R; Blandford RD; Borgland AW; Bregeon J; Bruel P; Buehler R; Buson S; Caliandro GA; Cameron RA; Caraveo PA; Cavazzuti E; Cecchi C; Chaves RCG; Chekhtman A; Cheung CC; Chiang J; Ciprini S; Claus R; Cohen-Tanugi J; DAmmando F; de Angelis A; Dermer CD; Digel SW; Silva EDE; Drell PS; Drlica-Wagner A; Favuzzi C; Focke WB; Franckowiak A; Fukazawa Y; Fusco P; Gargano F; Gasparrini D; Germani S; Giglietto N; Giommi P; Giordano F; Giroletti M; Glanzman T; Godfrey G; Grenier IA; Grove JE; Guiriec S; Hadasch D; Hayashida M; Hays E; Hughes RE; Jackson MS; Jogler T; Knodlseder J; Kuss M; Lande J; Larsson S; Longo F; Loparco F; Lovellette MN; Lubrano P; Mazziotta MN; Mehault J; Michelson PF; Mizuno T; Moiseev AA; Monte C; Monzani ME; Morselli A; Moskalenko IV; Murgia S; Nemmen R; Nuss E; Ohsugi T; Omodei N; Orienti M; Orlando E; Paneque D; Perkins JS; Piron F; Pivato G; Prokhorov D; Raino S; Razzano M; Razzaque S; Reimer A; Reimer O; Ritz S; Romoli C; Sanchez-Conde M; Sanchez DA; Sgro C; Siskind EJ; Spandre G; Spinelli P; Takahashi H; Tanaka T; Tibaldo L; Tinivella M; Tosti G; Troja E; Usher TL; Vandenbroucke J; Vasileiou V; Vianello G; Vitale V; Waite AP; Winer BL; Wood KS; Yang Z. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 784:2(2014), pp. 118.118-118.124. [10.1088/0004-637X/784/2/118]
Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN
D'AMMANDO, FILIPPO;
2014
Abstract
Observations of occultations of bright. gamma-ray sources by the Sun may reveal predicted pair halos around blazars and/or new physics, such as, e.g., hypothetical light dark matter particles-axions. We use Fermi Gamma-Ray Space Telescope (Fermi) data to analyze four occultations of blazar 3C 279 by the Sun on October 8 each year from 2008 to 2011. A combined analysis of the observations of these occultations allows a point-like source at the position of 3C 279 to be detected with significance of approximate to 3 sigma, but does not reveal any significant excess over the flux expected from the quiescent Sun. The likelihood ratio test rules out complete transparency of the Sun to the blazar. gamma-ray emission at a 3s confidence level.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
