Journal Articles The Astrophysical journal letters Year : 2009

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 , Jürgen 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
A. A. Abdo
  • Function : Author
Markus Ackermann
  • Function : Author
Marco Ajello
  • Function : Author
William B. Atwood
  • Function : Author
  • PersonId : 859767
Magnus Axelsson
  • Function : Author
Luca Baldini
  • Function : Author
Guido Barbiellini
  • Function : Author
D. Bastieri
  • Function : Author
B. M. Baughman
  • Function : Author
K. Bechtol
  • Function : Author
R. Bellazzini
  • Function : Author
B. Berenji
  • Function : Author
R. D. Blandford
  • Function : Author
E.D. Bloom
  • Function : Author
E. Bonamente
  • Function : Author
A.W. Borgland
  • Function : Author
J. Bregeon
A. Brez
  • Function : Author
M. Brigida
  • Function : Author
T.H. Burnett
  • Function : Author
S. Buson
  • Function : Author
G. A. Caliandro
  • Function : Author
R. A. Cameron
  • Function : Author
P. A. Caraveo
  • Function : Author
E. Cavazzuti
  • Function : Author
C. Cecchi
  • Function : Author
O. Celik
  • Function : Author
S. Chaty
A. Chekhtman
  • Function : Author
C.C. Cheung
  • Function : Author
J. Chiang
  • Function : Author
S. Ciprini
  • Function : Author
R. Claus
  • Function : Author
L.R. Cominski
  • Function : Author
J. Conrad
  • Function : Author
S. Corbel
  • Function : Author
R. Corbet
  • Function : Author
S. Cutini
  • Function : Author
C. D. Dermer
  • Function : Author
A. de Angelis
  • Function : Author
F. de Palma
  • Function : Author
S. W. Digel
  • Function : Author
E. Do Couto E Silva
  • Function : Author
P.S. Drell
  • Function : Author
R. Dubois
  • Function : Author
G. Dubus
C. Favuzzi
  • Function : Author
S.J. Fegan
W.B. Focke
  • Function : Author
M. Frailis
  • Function : Author
Y. Fukazawa
S. Funk
  • Function : Author
P. Fusco
  • Function : Author
F. Gargano
  • Function : Author
D. Gasparrini
  • Function : Author
N. Gehrels
  • Function : Author
S. Germani
  • Function : Author
N. Giglietto
F. Giordano
  • Function : Author
T. Glanzman
  • Function : Author
G. Godfrey
  • Function : Author
J.E. Grove
  • Function : Author
Y. Hanabata
  • Function : Author
A.K. Harding
  • Function : Author
M. Hayashida
  • Function : Author
E. Hays
  • Function : Author
R.E. Hugues
  • Function : Author
M.S. Jackson
  • Function : Author
G. Jóhannesson
  • Function : Author
T. J. Johnson
  • Function : Author
W. N. Johnson
  • Function : Author
A.S. Johnson
  • Function : Author
T. Kamae
  • Function : Author
H. Katagiri
  • Function : Author
J. Kataoka
  • Function : Author
N. Kawai
  • Function : Author
M. Kerr
  • Function : Author
M. L. Kocian
  • Function : Author
F. Kuehn
  • Function : Author
M. Kuss
  • Function : Author
J. Lande
  • Function : Author
S. Larsson
  • Function : Author
L. Latronico
  • Function : Author
F. Longo
F. Loparco
  • Function : Author
B. Lott
M.N. Lovellette
  • Function : Author
P. Lubrano
  • Function : Author
G. M. Madejski
  • Function : Author
A. Makeev
  • Function : Author
M. Marelli
  • Function : Author
M.N. Mazziotta
  • Function : Author
J.E. Mcenery
  • Function : Author
C. Meurer
  • Function : Author
P.F. Michelson
  • Function : Author
W. Mitthumsiri
  • Function : Author
T. Mizuno
  • Function : Author
A.A. Moiseev
C. Monte
  • Function : Author
M.E. Monzani
  • Function : Author
A. Morselli
  • Function : Author
I.V. Moskalenko
  • Function : Author
S. Murgia
  • Function : Author
P. L. Nolan
  • Function : Author
J. P. Norris
  • Function : Author
T. Ohsugi
  • Function : Author
N. Omodei
  • Function : Author
E. Orlando
  • Function : Author
J.F. Ormes
  • Function : Author
M. Ozaki
D. Paneque
J.H. Panetta
  • Function : Author
M. Pepe
  • Function : Author
M. Pesce-Rollins
T.A. Porter
  • Function : Author
S. Rainò
  • Function : Author
R. Rando
  • Function : Author
P.S. Ray
  • Function : Author
M. Razzano
  • Function : Author
N. Rea
  • Function : Author
A. Reimer
O. Reimer
  • Function : Author
S. Ritz
  • Function : Author
L.S. Rochester
  • Function : Author
A.Y. Rodriguez
  • Function : Author
R.W. Romani
  • Function : Author
M. Roth
  • Function : Author
F. Ryde
  • Function : Author
A. Sander
P.M. Saz Parkinson
  • Function : Author
J.D. Scargle
  • Function : Author
C. Sgrò
  • Function : Author
A. Sierpowska-Bartosik
  • Function : Author
E.J. Siskind
  • Function : Author
P. D. Smith
  • Function : Author
G. Spandre
  • Function : Author
P. Spinelli
  • Function : Author
M.S. Strickman
  • Function : Author
D.J. Suson
  • Function : Author
H. Tajima
  • Function : Author
H. Takahashi
  • Function : Author
T. Takahashi
  • Function : Author
T. Tanaka
Y. Tanaka
  • Function : Author
J.B. Thayer
  • Function : Author
D.J. Thompson
  • Function : Author
D.F. Torres
  • Function : Author
G. Tosti
  • Function : Author
A. Tramacere
  • Function : Author
Y. Uchiyama
  • Function : Author
T.L. Usher
  • Function : Author
V. Vasileiou
  • Function : Author
C. Venter
V. Vitale
A. P. Waite
  • Function : Author
E. Wallace
  • Function : Author
P. Wang
  • Function : Author
B. L. Winer
  • Function : Author
K.S. Wood
  • Function : Author
T. Ylinen
  • Function : Author
M. Ziegler
  • Function : Author

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.

Dates and versions

in2p3-00436279 , version 1 (26-11-2009)

Identifiers

Cite

A. A. Abdo, Markus Ackermann, Marco Ajello, William B. Atwood, Magnus Axelsson, et al.. Fermi LAT Observations of LS 5039. The Astrophysical journal letters, 2009, 706, pp.L56-L61. ⟨10.1088/0004-637X/706/1/L56⟩. ⟨in2p3-00436279⟩
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