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| Titre : |
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DISCOVERY OF HIGH-ENERGY GAMMA-RAY EMISSION FROM THE BINARY SYSTEM PSR B1259-63/LS 2883 AROUND PERIASTRON WITH FERMI |
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| Auteur : |
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A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, J. Ballet1, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. Bonamente, A. W. Borgland, J. Bregeon, M. Brigida, P. Bruel2, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, F. Camilo, P. A. Caraveo, C. Cecchi, E. Charles, S. Chaty1, A. Chekhtman, M. Chernyakova, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi3, L. R. Cominsky, S. Corbel4, S. Cutini, F. D'ammando, A. De Angelis, P. R. Den Hartog, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva2, M. Dormody, P. S. Drell, A. Drlica-Wagner, R. Dubois, G. Dubus5, D. Dumora6, T. Enoto, C. M. Espinoza, C. Favuzzi, S. J. Fegan2, E. C. Ferrara, W. B. Focke, P. Fortin2, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier1, M.-H. Grondin, J. E. Grove, E. Grundstrom, S. Guiriec, C. Gwon, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, G. J'ohannesson, A. S. Johnson, T. J. Johnson, S. Johnston, T. Kamae, H. Katagiri, J. Kataoka, M. Keith, M. Kerr, J. Kn¨odlseder7, M. Kramer, M. Kuss, J. Lande, S.-H. Lee, M. Lemoine-Goumard6, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, R. N. Manchester, M. Marelli, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, M. Naumann-Godo1, A. Neronov, P. L. Nolan, J. P. Norris, A. Noutsos, E. Nuss3, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, D. Paneque, D. Parent, M. Pesce-Rollins, M. Pierbattista1, F. Piron3, T. A. Porter, A. Possenti, S. Rain'o, R. Rando, P. S. Ray, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur6, S. Ritz, H. F.-W. Sadrozinski, J. D. Scargle, C. Sgr'o, R. Shannon, E. J. Siskind, P. D. Smith, G. Spandre, P. Spinelli, M. S. Strickman, D. J. Suson, H. Takahashi, T. Tanaka, J. G. Thayer, J. B. Thayer, D. J. Thompson, S. E. Thorsett, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, E. Troja, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou3, G. Vianello, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, M. T. Wolff, D. L. Wood, K. S. Wood, Z. Yang, M. Ziegler, S. Zimmer |
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| Laboratoire : |
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| équipe(s) de recherche : |
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GLAST |
| Résumé : |
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We report on the discovery of 100 MeV γ -rays from the binary system PSR B1259−63/LS 2883 using the Large Area Telescope (LAT) on board Fermi. The system comprises a radio pulsar in orbit around a Be star. We report on LAT observations from near apastron to ∼128 days after the time of periastron, tp, on 2010 December 15. No γ -ray emission was detected from this source when it was far from periastron. Faint γ -ray emission appeared as the pulsar approached periastron. At ∼tp + 30 days, the 100 MeV γ -ray flux increased over a period of a few days to a peak flux 20-30 times that seen during the pre-periastron period, but with a softer spectrum. For the following month, it was seen to be variable on daily timescales, but remained at ∼(1-4) × 10−6 cm−2 s−1 before starting to fade at ∼tp +57 days. The total γ -ray luminosity observed during this period is comparable to the spin-down power of the pulsar. Simultaneous radio and X-ray observations of the source showed no corresponding dramatic changes in radio and X-ray flux between the pre-periastron and post-periastron flares. We discuss possible explanations for the observed γ -ray-only flaring of the source. |
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| Collaboration/Projet : |
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Fermi-LAT |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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20/07/2011 |
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| Nom du périodique : |
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The Astrophysical Journal Letters |
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| Volume : |
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736 |
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| Page/Article : |
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L11 |
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| Identifiant local : |
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arXiv:1103.4108 |
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| Mot(s)-clé(s) : |
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binaries: eclipsing - gamma rays: stars - pulsars: individual (PSR B1259−63) - X-rays: binaries |
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