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DISCOVERY OF HIGH-ENERGY GAMMA-RAY EMISSION FROM THE BINARY SYSTEM PSR B1259-63/LS 2883 AROUND PERIASTRON WITH FERMI

A. Abdo, A. / Ackermann, M. / Ajello, M. / Allafort, A. / Ballet, J. / Barbiellini, G. / Bastieri, D. / Bechtol, K. / Bellazzini, R. / Berenji, B. / D. Blandford, R. / Bonamente, E. / W. Borgland, A. / Bregeon, J. / Brigida, M. / Bruel, P. / Buehler, R. / Buson, S. / A. Caliandro, G. / A. Cameron, R. / Camilo, F. / A. Caraveo, P. / Cecchi, C. / Charles, E. / Chaty, S. / Chekhtman, A. / Chernyakova, M. / C. Cheung, C. / Chiang, J. / Ciprini, S. / Claus, R. / Cohen-Tanugi, J. / R. Cominsky, L. / Corbel, S. / Cutini, S. / D'Ammando, F. / De Angelis, A. / R. Den Hartog, P. / De Palma, F. / D. Dermer, C. / W. Digel, S. / Do Couto E Silva2, E. / Dormody, M. / S. Drell, P. / Drlica-Wagner, A. / Dubois, R. / Dubus, G. / Dumora, D. / Enoto, T. / M. Espinoza, C. / Favuzzi, C. / J. Fegan, S. / C. Ferrara, E. / B. Focke, W. / Fortin, P. / Fukazawa, Y. / Funk, S. / Fusco, P. / Gargano, F. / Gasparrini, D. / Gehrels, N. / Germani, S. / Giglietto, N. / Giommi, P. / Giordano, F. / Giroletti, M. / Glanzman, T. / Godfrey, G. / A. Grenier, I. / Grondin, M.-H. / E. Grove, J. / Grundstrom, E. / Guiriec, S. / Gwon, C. / Hadasch, D. / K. Harding, A. / Hayashida, M. / Hays, E. / J'Ohannesson, G. / S. Johnson, A. / J. Johnson, T. / Johnston, S. / Kamae, T. / Katagiri, H. / Kataoka, J. / Keith, M. / Kerr, M. / Kn¨odlseder, J. / Kramer, M. / Kuss, M. / Lande, J. / Lee, S.-H. / Lemoine-Goumard, M. / Longo, F. / Loparco, F. / N. Lovellette, M. / Lubrano, P. / N. Manchester, R. / Marelli, M. / N. Mazziotta, M. / F. Michelson, P. / Mitthumsiri, W. / Mizuno, T. / A. Moiseev, A. / Monte, C. / E. Monzani, M. / Morselli, A. / V. Moskalenko, I. / Murgia, S. / Nakamori, T. / Naumann-Godo, M. / Neronov, A. / L. Nolan, P. / P. Norris, J. / Noutsos, A. / Nuss, E. / Ohsugi, T. / Okumura, A. / Omodei, N. / Orlando, E. / Paneque, D. / Parent, D. / Pesce-Rollins, M. / Pierbattista, M. / Piron, F. / Porter, T.A. / Possenti, A. / Rain'O, S. / Rando, R. / S. Ray, P. / Razzano, M. / Razzaque, S. / Reimer, A. / Reimer, O. / Reposeur, T. / Ritz, S. / F.-W. Sadrozinski, H. / D. Scargle, J. / Sgr'O, C. / Shannon, R. / J. Siskind, E. / D. Smith, P. / Spandre, G. / Spinelli, P. / S. Strickman, M. / J. Suson, D. / Takahashi, H. / Tanaka, T. / G. Thayer, J. / B. Thayer, J. / J. Thompson, D. / E. Thorsett, S. / Tibaldo, L. / Tibolla, O. / F. Torres, D. / Tosti, G. / Troja, E. / Uchiyama, Y. / L. Usher, T. / Vandenbroucke, J. / Vasileiou, V. / Vianello, G. / Vitale, V. / P. Waite, A. / Wang, P. / L. Winer, B. / T. Wolff, M. / L. Wood, D. / S. Wood, K. / Yang, Z. / Ziegler, M. / Zimmer, S. - 2011
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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