Fermi LAT Observations of LS 5039
- A. ABDO, A.
- ACKERMANN, Markus
- AJELLO, Marco
- ATWOOD, William B.
- AXELSSON, Magnus
- BALDINI, Luca
- BALLET, Jean
- BARBIELLINI, Guido
- BASTIERI, D.
- BAUGHMAN, B. M.
- BECHTOL, K.
- BELLAZZINI, R.
- BERENJI, B.
- BLANDFORD, R. D.
- BLOOM, E.D.
- BONAMENTE, E.
- BORGLAND, A.W.
- BREGEON, J.
- BREZ, A.
- BRIGIDA, M.
- BRUEL, Pascal
- BURNETT, T.H.
- BUSON, S.
- CALIANDRO, G. A.
- CAMERON, R. A.
- CARAVEO, P. A.
- CASANDJIAN, J.M.
- CAVAZZUTI, E.
- CECCHI, C.
- CELIK, O.
- CHATY, S.
- CHEKHTMAN, A.
- CHEUNG, C.C.
- CHIANG, J.
- CIPRINI, S.
- CLAUS, R.
- COHEN-TANUGI, J.
- COMINSKI, L.R.
- CONRAD, J.
- CORBEL, S.
- CORBET, R.
- CUTINI, S.
- DERMER, C. D.
- DE ANGELIS, A.
- DE PALMA, F.
- DIGEL, S. W.
- DO COUTO E SILVA, E.
- DRELL, P.S.
- DUBOIS, R.
- DUBUS, G.
- DUMORA, D.
- FARNIER, C.
- FAVUZZI, C.
- FEGAN, S.J.
- FOCKE, W.B.
- FORTIN, P.
- FRAILIS, M.
- FUKAZAWA, Y.
- FUNK, S.
- FUSCO, P.
- GARGANO, F.
- GASPARRINI, D.
- GEHRELS, N.
- GERMANI, S.
- GIEBELS, B.
- GIGLIETTO, N.
- GIORDANO, F.
- GLANZMAN, T.
- GODFREY, G.
- GRENIER, I.A.
- GRONDIN, M.H.
- GROVE, J.E.
- GUILLEMOT, L.
- GUIRIEC, S.
- HANABATA, Y.
- HARDING, A.K.
- HAYASHIDA, M.
- HAYS, E.
- HILL, A.B.
- HORAN, D.
- HUGUES, R.E.
- JACKSON, M.S.
- JÓHANNESSON, G.
- JOHNSON, T. J.
- JOHNSON, W. N.
- JOHNSON, A.S.
- KAMAE, T.
- KATAGIRI, H.
- KATAOKA, J.
- KAWAI, N.
- KERR, M.
- KNÖDLSEDER, Jürgen
- KOCIAN, M. L.
- KUEHN, F.
- KUSS, M.
- LANDE, J.
- LARSSON, S.
- LATRONICO, L.
- LEMOINE-GOUMARD, M.
- LONGO, F.
- LOPARCO, F.
- LOTT, B.
- LOVELLETTE, M.N.
- LUBRANO, P.
- MADEJSKI, G. M.
- MAKEEV, A.
- MARELLI, M.
- MAZZIOTTA, M.N.
- MCENERY, J.E.
- MEURER, C.
- MICHELSON, P.F.
- MITTHUMSIRI, W.
- MIZUNO, T.
- MOISEEV, A.A.
- MONTE, C.
- MONZANI, M.E.
- MORSELLI, A.
- MOSKALENKO, I.V.
- MURGIA, S.
- NOLAN, P. L.
- NORRIS, J. P.
- NUSS, E.
- OHSUGI, T.
- OMODEI, N.
- ORLANDO, E.
- ORMES, J.F.
- OZAKI, M.
- PANEQUE, D.
- PANETTA, J.H.
- PARENT, D.
- PELASSA, V.
- PEPE, M.
- PESCE-ROLLINS, M.
- PIRON, F.
- PORTER, T.A.
- RAINÒ, S.
- RANDO, R.
- RAY, P.S.
- RAZZANO, M.
- REA, N.
- REIMER, A.
- REIMER, O.
- REPOSEUR, T.
- RITZ, S.
- ROCHESTER, L.S.
- RODRIGUEZ, A.Y.
- ROMANI, R.W.
- ROTH, M.
- RYDE, F.
- SANCHEZ, D.
- SANDER, A.
- SAZ PARKINSON, P.M.
- SCARGLE, J.D.
- SGRÒ, C.
- SIERPOWSKA-BARTOSIK, A.
- SISKIND, E.J.
- SMITH, D. A.
- SMITH, P. D.
- SPANDRE, G.
- SPINELLI, P.
- STRICKMAN, M.S.
- SUSON, D.J.
- TAJIMA, H.
- TAKAHASHI, H.
- TAKAHASHI, T.
- TANAKA, T.
- TANAKA, Y.
- THAYER, J.B.
- THOMPSON, D.J.
- TIBALDO, L.
- TORRES, D.F.
- TOSTI, G.
- TRAMACERE, A.
- UCHIYAMA, Y.
- USHER, T.L.
- VASILEIOU, V.
- VENTER, C.
- VILCHEZ, N.
- VITALE, V.
- WAITE, A. P.
- WALLACE, E.
- WANG, P.
- WINER, B. L.
- WOOD, K.S.
- YLINEN, T.
- ZIEGLER, M.
DOIAbstract
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 ind...
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