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Observations of occultations of bright γ-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 3σ, 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 γ-ray emission at a 3σ confidence level. © 2014. The American Astronomical Society. All rights reserved..

Fermi large area telescope observations of blazar 3C 279 occultations by the sun

Barbiellini, G.;Bastieri, D.;Bechtol, K.;BELLAZZINI, RONALDO;Blandford, R. D.;Borgland, A. W.;BREGEON, JOHAN;Bruel, P.;Buehler, R.;Buson, S.;Caliandro, G. A.;Cameron, R. A.;Caraveo, P. A.;Cavazzuti, E.;Cecchi, C.;Chaves, R. C. G.;Chekhtman, A.;Cheung, C. C.;Chiang, J.;Ciprini, S.;Claus, R.;Cohen Tanugi, J.;D'Ammando, F.;De Angelis, A.;Dermer, C. D.;Digel, S. W.;Silva, E. Do Couto E;Drell, P. S.;Drlica Wagner, A.;Favuzzi, C.;Focke, W. B.;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, I. A.;Grove, J. E.;Guiriec, S.;Hadasch, D.;Hayashida, M.;Hays, E.;Hughes, R. E.;Jackson, M. S.;Jogler, T.;Knödlseder, J.;Kuss, M.;Lande, J.;Larsson, S.;Longo, F.;Loparco, F.;Lovellette, M. N.;Lubrano, P.;Mazziotta, M. N.;Mehault, J.;Michelson, P. F.;Mizuno, T.;Moiseev, A. A.;Monte, C.;Monzani, M. E.;Morselli, A.;Moskalenko, I. V.;Murgia, S.;Nemmen, R.;Nuss, E.;Ohsugi, T.;Omodei, N.;Orienti, M.;Orlando, E.;Paneque, D.;Perkins, J. S.;Piron, F.;PIVATO, GIOVANNA;Prokhorov, D.;Rainò, S.;RAZZANO, MASSIMILIANO;Razzaque, S.;Reimer, A.;Reimer, O.;Ritz, S.;Romoli, C.;Sánchez Conde, M.;Sanchez, D. A.;SGRO', CARMELO;Siskind, E. J.;SPANDRE, GLORIA;Spinelli, P.;Takahashi, H.;Tanaka, T.;Tibaldo, L.;TINIVELLA, MARCO;Tosti, G.;Troja, E.;Usher, T. L.;Vandenbroucke, J.;Vasileiou, V.;Vianello, G.;Vitale, V.;Waite, A. P.;Winer, B. L.;Wood, K. S.;Yang, Z.

2014-01-01

Abstract

Observations of occultations of bright γ-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 3σ, 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 γ-ray emission at a 3σ confidence level. © 2014. The American Astronomical Society. All rights reserved..

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Scheda completa (DC)

	Anno
	
			2014
		
	Codice DOI
	
			https://dx.doi.org/10.1088/0004-637X/784/2/118
		
	Tutti gli autori
	
			Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, Ronaldo; Blandford, R. D.; Borgland, A. W.; Bregeon, Johan; Bruel, P.; Buehler, R.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Cavazzuti, E.; Cecchi, C.; Chaves, R. C. G.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen Tanugi, J.; D'Ammando, F.; De Angelis, A.; Dermer, C. D.; Digel, S. W.; Silva, E. Do Couto E; Drell, P. S.; Drlica Wagner, A.; Favuzzi, C.; Focke, W. B.; 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, I. A.; Grove, J. E.; Guiriec, S.; Hadasch, D.; Hayashida, M.; Hays, E.; Hughes, R. E.; Jackson, M. S.; Jogler, T.; Knödlseder, J.; Kuss, M.; Lande, J.; Larsson, S.; Longo, F.; Loparco, F.; Lovellette, M. N.; Lubrano, P.; Mazziotta, M. N.; Mehault, J.; Michelson, P. F.; Mizuno, T.; Moiseev, A. A.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nemmen, R.; Nuss, E.; Ohsugi, T.; Omodei, N.; Orienti, M.; Orlando, E.; Paneque, D.; Perkins, J. S.; Piron, F.; Pivato, Giovanna; Prokhorov, D.; Rainò, S.; Razzano, Massimiliano; Razzaque, S.; Reimer, A.; Reimer, O.; Ritz, S.; Romoli, C.; Sánchez Conde, M.; Sanchez, D. A.; Sgro', Carmelo; Siskind, E. J.; Spandre, Gloria; Spinelli, P.; Takahashi, H.; Tanaka, T.; Tibaldo, L.; Tinivella, Marco; Tosti, G.; Troja, E.; Usher, T. L.; Vandenbroucke, J.; Vasileiou, V.; Vianello, G.; Vitale, V.; Waite, A. P.; Winer, B. L.; Wood, K. S.; Yang, Z.
		
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/827734

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