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Fermi LAT Observations of LS 5039

A. A. Abdo Markus Ackermann Marco Ajello William B. Atwood Magnus Axelsson Luca Baldini Jean Ballet 1 Guido Barbiellini D. Bastieri B. M. Baughman K. Bechtol R. Bellazzini B. Berenji R. D. Blandford E.D. Bloom E. Bonamente A.W. Borgland J. Bregeon A. Brez M. Brigida Pascal Bruel 2 T.H. Burnett S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J.M. Casandjian 1 E. Cavazzuti C. Cecchi O. Celik S. Chaty 1 A. Chekhtman C.C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 3 L.R. Cominski J. Conrad S. Corbel R. Corbet S. Cutini C. D. Dermer A. de Angelis F. de Palma S. W. Digel E. Do Couto E Silva P.S. Drell R. Dubois G. Dubus 4 D. Dumora 5 C. Farnier 3 C. Favuzzi S.J. Fegan 2 W.B. Focke P. Fortin 2 M. Frailis Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Gehrels S. Germani B. Giebels 2 N. Giglietto F. Giordano T. Glanzman G. Godfrey I.A. Grenier 1 M.H. Grondin 5 J.E. Grove L. Guillemot 5 S. Guiriec 3 Y. Hanabata A.K. Harding M. Hayashida E. Hays A.B. Hill 4 D. Horan 2 R.E. Hugues M.S. Jackson G. Jóhannesson T. J. Johnson W. N. Johnson A.S. Johnson T. Kamae H. Katagiri J. Kataoka N. Kawai M. Kerr J. Knödlseder 6 M. L. Kocian F. Kuehn M. Kuss J. Lande S. Larsson L. Latronico M. Lemoine-Goumard 5 F. Longo F. Loparco B. Lott 5 M.N. Lovellette P. Lubrano G. M. Madejski A. Makeev M. Marelli M.N. Mazziotta J.E. Mcenery C. Meurer P.F. Michelson W. Mitthumsiri T. Mizuno A.A. Moiseev C. Monte M.E. Monzani A. Morselli I.V. Moskalenko S. Murgia P. L. Nolan J. P. Norris E. Nuss 3 T. Ohsugi N. Omodei E. Orlando J.F. Ormes M. Ozaki D. Paneque J.H. Panetta D. Parent 5 V. Pelassa 3 M. Pepe M. Pesce-Rollins F. Piron 3 T.A. Porter S. Rainò R. Rando P.S. Ray M. Razzano N. Rea A. Reimer O. Reimer T. Reposeur 5 S. Ritz L.S. Rochester A.Y. Rodriguez R.W. Romani M. Roth F. Ryde D. Sanchez 2 A. Sander P.M. Saz Parkinson J.D. Scargle C. Sgrò A. Sierpowska-Bartosik E.J. Siskind D. A. Smith 5 P. D. Smith G. Spandre P. Spinelli M.S. Strickman D.J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka Y. Tanaka J.B. Thayer D.J. Thompson L. Tibaldo 1 D.F. Torres G. Tosti A. Tramacere Y. Uchiyama T.L. Usher V. Vasileiou C. Venter N. Vilchez 6 V. Vitale A. P. Waite E. Wallace P. Wang B. L. Winer K.S. Wood T. Ylinen M. Ziegler
Abstract : The first results from observations of the high mass X-ray binary LS 5039 using the Fermi Gamma-ray Space Telescope data between 2008 August and 2009 June are presented. Our results indicate variability that is consistent with the binary period, with the emission being modulated with a period of 3.903 +/- 0.005 days; the first detection of this modulation at GeV energies. The light curve is characterized by a broad peak around superior conjunction in agreement with inverse Compton scattering models. The spectrum is represented by a power law with an exponential cutoff, yielding an overall flux (100 MeV - 300 GeV) of 4.9 +/- 0.5(stat) +/- 1.8(syst) x 10^-7 photon cm^-2 s^-1, with a cutoff at 2.1 +/- 0.3(stat) +/- 1.1(syst) GeV and photon index Gamma = 1.9 +/- 0.1(stat) +/- 0.3(syst). The spectrum is observed to vary with orbital phase, specifically between inferior and superior conjunction. We suggest that the presence of a cutoff in the spectrum may be indicative of magnetospheric emission similar to the emission seen in many pulsars by Fermi.
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Submitted on : Thursday, November 26, 2009 - 11:37:06 AM
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A. A. Abdo, Markus Ackermann, Marco Ajello, William B. Atwood, Magnus Axelsson, et al.. Fermi LAT Observations of LS 5039. The Astrophysical journal letters, Bristol : IOP Publishing, 2009, 706, pp.L56-L61. ⟨10.1088/0004-637X/706/1/L56⟩. ⟨in2p3-00436279⟩

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