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

A. A. Abdo M. Ackermann M. Ajello A. Allafort J. Ballet 1 G. Barbiellini D. Bastieri K. Bechtol R. Bellazzini B. Berenji R. D. Blandford E. Bonamente A. W. Borgland J. Bregeon M. Brigida P. Bruel 2 R. Buehler S. Buson G. A. Caliandro R. A. Cameron F. Camilo P. A. Caraveo C. Cecchi E. Charles S. Chaty 1 A. Chekhtman M. Chernyakova C. C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 3 L. R. Cominsky S. Corbel 4 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. Dubus 5 D. Dumora 6 T. Enoto C. M. Espinoza C. Favuzzi S. J. Fegan 2 E. C. Ferrara W. B. Focke P. Fortin 2 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. Grenier 1 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¨odlseder 7 M. Kramer M. Kuss J. Lande S.-H. Lee M. Lemoine-Goumard 6 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-Godo 1 A. Neronov P. L. Nolan J. P. Norris A. Noutsos E. Nuss 3 T. Ohsugi A. Okumura N. Omodei E. Orlando D. Paneque D. Parent M. Pesce-Rollins M. Pierbattista 1 F. Piron 3 T. A. Porter A. Possenti S. Rain'O R. Rando P. S. Ray M. Razzano S. Razzaque A. Reimer O. Reimer T. Reposeur 6 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. Vasileiou 3 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
Abstract : 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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Submitted on : Friday, December 23, 2011 - 2:00:45 PM
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A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, J. Ballet, et al.. DISCOVERY OF HIGH-ENERGY GAMMA-RAY EMISSION FROM THE BINARY SYSTEM PSR B1259-63/LS 2883 AROUND PERIASTRON WITH FERMI. The Astrophysical Journal Letters, 2011, 736, pp.L11. <10.1088/2041-8205/736/1/L11>. <in2p3-00654867>

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