Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN

BARBIELLINI AMIDEI, GUIDO; Bastieri, D.; Bechtol, K.; Bellazzini, R.; Blandford, R. D.; Borgland, A. W.; Bregeon, J.; 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, FRANCESCO; 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, G.; Prokhorov, D.; Rainò, S.; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Ritz, S.; Romoli, C.; Sánchez Conde, M.; Sanchez, D. A.; Sgrò, C.; Siskind, E. J.; Spandre, G.; Spinelli, P.; Takahashi, H.; Tanaka, T.; Tibaldo, L.; Tinivella, M.; 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.

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

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.

Titolo:	Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN
Autori:	BARBIELLINI AMIDEI, GUIDO D. Bastieri K. Bechtol R. Bellazzini R. D. Blandford A. W. Borgland J. Bregeon P. Bruel R. Buehler S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo E. Cavazzuti C. Cecchi R. C. G. Chaves A. Chekhtman C. C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen Tanugi F. D'Ammando A. de Angelis C. D. Dermer S. W. Digel E. do Couto e. Silva P. S. Drell A. Drlica Wagner C. Favuzzi W. B. Focke A. Franckowiak Y. Fukazawa P. Fusco F. Gargano D. Gasparrini S. Germani N. Giglietto P. Giommi F. Giordano M. Giroletti T. Glanzman G. Godfrey I. A. Grenier J. E. Grove S. Guiriec D. Hadasch M. Hayashida E. Hays R. E. Hughes M. S. Jackson T. Jogler J. Knödlseder M. Kuss J. Lande S. Larsson LONGO, FRANCESCO F. Loparco M. N. Lovellette P. Lubrano M. N. Mazziotta J. Mehault P. F. Michelson T. Mizuno A. A. Moiseev C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia R. Nemmen E. Nuss T. Ohsugi N. Omodei M. Orienti ORLANDO, ELENA D. Paneque J. S. Perkins F. Piron G. Pivato D. Prokhorov S. Rainò M. Razzano S. Razzaque A. Reimer O. Reimer S. Ritz C. Romoli M. Sánchez Conde D. A. Sanchez C. Sgrò E. J. Siskind G. Spandre P. Spinelli H. Takahashi T. Tanaka L. Tibaldo M. Tinivella G. Tosti E. Troja T. L. Usher J. Vandenbroucke V. Vasileiou G. Vianello V. Vitale A. P. Waite B. L. Winer K. S. Wood Z. Yang mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2014
Rivista:	THE ASTROPHYSICAL JOURNAL
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.
Handle:	http://hdl.handle.net/11368/2766735
Digital Object Identifier (DOI):	10.1088/0004-637X/784/2/118
Appare nelle tipologie:	1.1 Articolo in Rivista

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