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; D'Ammando, F; de Angelis, A; Dermer, Cd; Digel, Sw; Silva, Ede; Drell, Ps; Drlica Wagner, A; Favuzzi, C; Focke, Wb; Franckowiak, A; Fukazawa, Y; Fusco, Piergiorgio; Gargano, F; Gasparrini, D; Germani, S; Giglietto, N; Giommi, P; Giordano, Francesco; 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, Francesco; 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', Silvia; 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.

doi:10.1088/0004-637X/784/2/118

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.

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Titolo:	Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN
Autori:	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 D'Ammando F de Angelis A Dermer CD Digel SW Silva EDE Drell PS Drlica Wagner A Favuzzi C Focke WB Franckowiak A Fukazawa Y FUSCO, Piergiorgio Gargano F Gasparrini D Germani S Giglietto N Giommi P GIORDANO, FRANCESCO 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, FRANCESCO 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', SILVIA 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. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2014
Rivista:	THE ASTROPHYSICAL JOURNAL
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.
Handle:	http://hdl.handle.net/11586/128872
Appare nelle tipologie:	1.1 Articolo in rivista

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