Fermi LAT Observations of LS 5039

A. A. Abdo; M. Ackermann; Marco Ajello; William B. Atwood; Magnus Axelsson; Luca Baldini; Jean Ballet; 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; T.H. Burnett; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J.M. Casandjian; E. Cavazzuti; C. Cecchi; O. Celik; S. Chaty; A. Chekhtman; C.C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; 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; D. Dumora; C. Farnier; C. Favuzzi; S.J. Fegan; W.B. Focke; P. Fortin; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; B. Giebels; N. Giglietto; F. Giordano; T. Glanzman; G. Godfrey; I.A. Grenier; M.H. Grondin; J.E. Grove; L. Guillemot; S. Guiriec; Y. Hanabata; A.K. Harding; M. Hayashida; E. Hays; A.B. Hill; D. Horan; 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; Jürgen Knödlseder; M. L. Kocian; F. Kuehn; M. Kuss; J. Lande; S. Larsson; L. Latronico; M. Lemoine-Goumard; F. Longo; F. Loparco; B. Lott; 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; T. Ohsugi; N. Omodei; E. Orlando; J.F. Ormes; M. Ozaki; D. Paneque; J.H. Panetta; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; F. Piron; T.A. Porter; S. Rainò; R. Rando; P.S. Ray; M. Razzano; N. Rea; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; L.S. Rochester; A.Y. Rodriguez; R.W. Romani; M. Roth; F. Ryde; D. Sanchez; A. Sander; P.M. Saz Parkinson; J.D. Scargle; C. Sgrò; A. Sierpowska-Bartosik; E.J. Siskind; D. A. Smith; 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; D.F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T.L. Usher; V. Vasileiou; C. Venter; N. Vilchez; V. Vitale; A. P. Waite; E. Wallace; P. Wang; B. L. Winer; K.S. Wood; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/706/1/L56

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Fermi LAT Observations of LS 5039

A. A. Abdo, M. Ackermann, Marco Ajello, William B. Atwood, Magnus Axelsson, Luca Baldini, Jean Ballet, Guido Barbiellini, D. Bastieri, B. M. Baughman, …

The Astrophysical Journal Letters, Vol.706, pp.L56-L61

20/11/2009

DOI: https://doi.org/10.1088/0004-637X/706/1/L56

Abstract

binaries: close

gamma rays: observations

stars: variables: other

X-rays: binaries

X-rays: individual (LS 5039)

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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Title: Fermi LAT Observations of LS 5039
Creators - without role: A. A. Abdo - National Academy of Sciences
M. Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
Marco Ajello - Kavli Institute for Particle Astrophysics and Cosmology
William B. Atwood - University of California, Santa Cruz
Magnus Axelsson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido Barbiellini - University of Trieste
D. Bastieri - University of Padua
B. M. Baughman - The Ohio State University
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
B. Berenji - Kavli Institute for Particle Astrophysics and Cosmology
R. D. Blandford - Kavli Institute for Particle Astrophysics and Cosmology
E.D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
A.W. Borgland - Stanford University
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Brez - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
T.H. Burnett - University of Washington
S. Buson - University of Padua
G. A. Caliandro - Polytechnic University of Bari
R. A. Cameron - Kavli Institute for Particle Astrophysics and Cosmology
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J.M. Casandjian - Université Paris Cité
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
O. Celik - Goddard Space Flight Center
S. Chaty - Université Paris Cité
A. Chekhtman - United States Naval Research Laboratory
C.C. Cheung - Goddard Space Flight Center
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
S. Ciprini - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Laboratoire de Physique Théorique
L.R. Cominski
J. Conrad - Stockholm University
S. Corbel - CEA Paris-Saclay
R. Corbet - University of Maryland, Baltimore County
S. Cutini - Agenzia Spaziale Italiana
C. D. Dermer - United States Naval Research Laboratory
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Polytechnic University of Bari
S. W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
E. Do Couto E Silva
P.S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
R. Dubois - Kavli Institute for Particle Astrophysics and Cosmology
G. Dubus - Université Joseph Fourier
D. Dumora - Laboratoire de Physique des deux infinis Bordeaux
C. Farnier - Laboratoire de Physique Théorique
C. Favuzzi - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S.J. Fegan - Laboratoire Leprince-Ringuet
W.B. Focke - Stanford University
P. Fortin - Centre National de la Recherche Scientifique
M. Frailis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Y. Fukazawa - Hiroshima University
S. Funk - Kavli Institute for Particle Astrophysics and Cosmology
P. Fusco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
B. Giebels - École Polytechnique
N. Giglietto - Polytechnic University of Bari
F. Giordano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
T. Glanzman - Kavli Institute for Particle Astrophysics and Cosmology
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I.A. Grenier - Astrophysique, Instrumentation et Modélisation
M.H. Grondin - Laboratoire de Physique des deux infinis Bordeaux
J.E. Grove - United States Naval Research Laboratory
L. Guillemot - Laboratoire de Physique des deux infinis Bordeaux
S. Guiriec - University of Alabama in Huntsville
Y. Hanabata - Hiroshima University
A.K. Harding - Goddard Space Flight Center
M. Hayashida - Kavli Institute for Particle Astrophysics and Cosmology
E. Hays - Goddard Space Flight Center
A.B. Hill - Université Joseph Fourier
D. Horan - Laboratoire Leprince-Ringuet
R.E. Hugues
M.S. Jackson - AlbaNova
G. Jóhannesson - Kavli Institute for Particle Astrophysics and Cosmology
T. J. Johnson - University of Maryland, College Park
W. N. Johnson - United States Naval Research Laboratory
A.S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
H. Katagiri - Hiroshima University
J. Kataoka - Tokyo Institute of Technology
N. Kawai - RIKEN
M. Kerr - University of Washington
Jürgen Knödlseder - Université Toulouse III - Paul Sabatier
M. L. Kocian - Kavli Institute for Particle Astrophysics and Cosmology
F. Kuehn - The Ohio State University
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
S. Larsson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Lemoine-Goumard - Laboratoire de Physique des deux infinis Bordeaux
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
B. Lott - Laboratoire de Physique des deux infinis Bordeaux
M.N. Lovellette - United States Naval Research Laboratory
P. Lubrano - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
G. M. Madejski - Kavli Institute for Particle Astrophysics and Cosmology
A. Makeev - United States Naval Research Laboratory
M. Marelli - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
M.N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J.E. Mcenery - Goddard Space Flight Center
C. Meurer - AlbaNova
P.F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
A.A. Moiseev - Goddard Space Flight Center
C. Monte - Polytechnic University of Bari
M.E. Monzani - SLAC National Accelerator Laboratory
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I.V. Moskalenko - Kavli Institute for Particle Astrophysics and Cosmology
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
P. L. Nolan - Kavli Institute for Particle Astrophysics and Cosmology
J. P. Norris - University of Denver
E. Nuss - Laboratoire de Physique Théorique
T. Ohsugi - Hiroshima University
N. Omodei - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Orlando - Max Planck Institute for Extraterrestrial Physics
J.F. Ormes - University of Denver
M. Ozaki - Institute of Space and Astronautical Science
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
J.H. Panetta - Kavli Institute for Particle Astrophysics and Cosmology
D. Parent - Institut National de Physique Nucléaire et de Physique des Particules
V. Pelassa - Institut National de Physique Nucléaire et de Physique des Particules
M. Pepe - University of Perugia
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Institut National de Physique Nucléaire et de Physique des Particules
T.A. Porter - University of California, Santa Cruz
S. Rainò - Polytechnic University of Bari
R. Rando - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
P.S. Ray - United States Naval Research Laboratory
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
N. Rea - Institute of Space Sciences
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
S. Ritz - University of California, Santa Cruz
L.S. Rochester - Stanford University
A.Y. Rodriguez - Institute of Space Sciences
R.W. Romani - Stanford University
M. Roth - University of Washington
F. Ryde - AlbaNova
D. Sanchez - Laboratoire Leprince-Ringuet
A. Sander - The Ohio State University
P.M. Saz Parkinson
J.D. Scargle - Ames Research Center
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Sierpowska-Bartosik - Institute of Space Sciences
E.J. Siskind - Real Time Tomography
D. A. Smith - Institut National de Physique Nucléaire et de Physique des Particules
P. D. Smith - The Ohio State University
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M.S. Strickman - United States Naval Research Laboratory
D.J. Suson - Purdue University Northwest
H. Tajima - Kavli Institute for Particle Astrophysics and Cosmology
H. Takahashi - Hiroshima University
T. Takahashi - Institute of Space and Astronautical Science
T. Tanaka - Stanford University
Y. Tanaka - Institute of Space and Astronautical Science
J.B. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
D.J. Thompson - Goddard Space Flight Center
L. Tibaldo - CEA Paris-Saclay
D.F. Torres - Institució Catalana de Recerca i Estudis Avançats
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Tramacere - Consorzio Interuniversitario Fisica Spaziale
Y. Uchiyama - Stanford University
T.L. Usher - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Goddard Space Flight Center
C. Venter - Goddard Space Flight Center
N. Vilchez - Université Toulouse III - Paul Sabatier
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
A. P. Waite - Kavli Institute for Particle Astrophysics and Cosmology
E. Wallace - University of Washington
P. Wang - Stanford University
B. L. Winer - The Ohio State University
K.S. Wood - United States Naval Research Laboratory
T. Ylinen - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Ziegler - University of California, Santa Cruz
Publication Details: The Astrophysical Journal Letters, Vol.706, pp.L56-L61
Identifiers: 9933904109311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00436279