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) ×10-7 photon cm-2 s-1, with a cutoff at 2.1 ± 0.3(stat) 1.1(syst) GeV and photon index Γ = 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.
| Original language | English |
|---|---|
| Pages (from-to) | L56-L61 |
| Journal | Astrophysical Journal |
| Volume | 706 |
| Issue number | 1 PART 2 |
| DOIs | |
| Publication status | Published - 2009 |
Keywords
- Binaries: close
- Gamma rays: observations
- Stars: variables: other
- X-rays: binaries
- X-rays: individual (LS 5039)
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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Fermi/lat observations of LS 5039. / Abdo, A. A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Axelsson, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; 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, P.; Burnett, T. H.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M.; Cavazzuti, E.; Cecchi, C.; Çelik, Ö; Chaty, S.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Cominsky, L. R.; Conrad, J.; Corbel, S.; Corbet, R.; Cutini, S.; Dermer, C. D.; De Angelis, A.; De Palma, F.; Digel, S. W.; Docouto 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.; Hughes, R. E.; Jackson, M. S.; Jóhannesson, G.; Johnson, A. S.; Johnson, T. J.; Johnson, W. N.; Kamae, T.; Katagiri, H.; Kataoka, J.; Kawai, N.; Kerr, M.; Knödlseder, J.; 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.; Sadrozinski, H. F.W.; 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.
In: Astrophysical Journal, Vol. 706, No. 1 PART 2, 2009, p. L56-L61.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Fermi/lat observations of LS 5039
AU - Abdo, A. A.
AU - Ackermann, M.
AU - Ajello, M.
AU - Atwood, W. B.
AU - Axelsson, M.
AU - Baldini, L.
AU - Ballet, J.
AU - Barbiellini, G.
AU - Bastieri, D.
AU - Baughman, B. M.
AU - Bechtol, K.
AU - Bellazzini, R.
AU - Berenji, B.
AU - Blandford, R. D.
AU - Bloom, E. D.
AU - Bonamente, E.
AU - Borgland, A. W.
AU - Bregeon, J.
AU - Brez, A.
AU - Brigida, M.
AU - Bruel, P.
AU - Burnett, T. H.
AU - Buson, S.
AU - Caliandro, G. A.
AU - Cameron, R. A.
AU - Caraveo, P. A.
AU - Casandjian, J. M.
AU - Cavazzuti, E.
AU - Cecchi, C.
AU - Çelik, Ö
AU - Chaty, S.
AU - Chekhtman, A.
AU - Cheung, C. C.
AU - Chiang, J.
AU - Ciprini, S.
AU - Claus, R.
AU - Cohen-Tanugi, J.
AU - Cominsky, L. R.
AU - Conrad, J.
AU - Corbel, S.
AU - Corbet, R.
AU - Cutini, S.
AU - Dermer, C. D.
AU - De Angelis, A.
AU - De Palma, F.
AU - Digel, S. W.
AU - Docouto E Silva, E.
AU - Drell, P. S.
AU - Dubois, R.
AU - Dubus, G.
AU - Dumora, D.
AU - Farnier, C.
AU - Favuzzi, C.
AU - Fegan, S. J.
AU - Focke, W. B.
AU - Fortin, P.
AU - Frailis, M.
AU - Fukazawa, Y.
AU - Funk, S.
AU - Fusco, P.
AU - Gargano, F.
AU - Gasparrini, D.
AU - Gehrels, N.
AU - Germani, S.
AU - Giebels, B.
AU - Giglietto, N.
AU - Giordano, F.
AU - Glanzman, T.
AU - Godfrey, G.
AU - Grenier, I. A.
AU - Grondin, M. H.
AU - Grove, J. E.
AU - Guillemot, L.
AU - Guiriec, S.
AU - Hanabata, Y.
AU - Harding, A. K.
AU - Hayashida, M.
AU - Hays, E.
AU - Hill, A. B.
AU - Horan, D.
AU - Hughes, R. E.
AU - Jackson, M. S.
AU - Jóhannesson, G.
AU - Johnson, A. S.
AU - Johnson, T. J.
AU - Johnson, W. N.
AU - Kamae, T.
AU - Katagiri, H.
AU - Kataoka, J.
AU - Kawai, N.
AU - Kerr, M.
AU - Knödlseder, J.
AU - Kocian, M. L.
AU - Kuehn, F.
AU - Kuss, M.
AU - Lande, J.
AU - Larsson, S.
AU - Latronico, L.
AU - Lemoine-Goumard, M.
AU - Longo, F.
AU - Loparco, F.
AU - Lott, B.
AU - Lovellette, M. N.
AU - Lubrano, P.
AU - Madejski, G. M.
AU - Makeev, A.
AU - Marelli, M.
AU - Mazziotta, M. N.
AU - McEnery, J. E.
AU - Meurer, C.
AU - Michelson, P. F.
AU - Mitthumsiri, W.
AU - Mizuno, T.
AU - Moiseev, A. A.
AU - Monte, C.
AU - Monzani, M. E.
AU - Morselli, A.
AU - Moskalenko, I. V.
AU - Murgia, S.
AU - Nolan, P. L.
AU - Norris, J. P.
AU - Nuss, E.
AU - Ohsugi, T.
AU - Omodei, N.
AU - Orlando, E.
AU - Ormes, J. F.
AU - Ozaki, M.
AU - Paneque, D.
AU - Panetta, J. H.
AU - Parent, D.
AU - Pelassa, V.
AU - Pepe, M.
AU - Pesce-Rollins, M.
AU - Piron, F.
AU - Porter, T. A.
AU - Rainò, S.
AU - Rando, R.
AU - Ray, P. S.
AU - Razzano, M.
AU - Rea, N.
AU - Reimer, A.
AU - Reimer, O.
AU - Reposeur, T.
AU - Ritz, S.
AU - Rochester, L. S.
AU - Rodriguez, A. Y.
AU - Romani, R. W.
AU - Roth, M.
AU - Ryde, F.
AU - Sadrozinski, H. F.W.
AU - Sanchez, D.
AU - Sander, A.
AU - Saz Parkinson, P. M.
AU - Scargle, J. D.
AU - Sgrò, C.
AU - Sierpowska-Bartosik, A.
AU - Siskind, E. J.
AU - Smith, D. A.
AU - Smith, P. D.
AU - Spandre, G.
AU - Spinelli, P.
AU - Strickman, M. S.
AU - Suson, D. J.
AU - Tajima, H.
AU - Takahashi, H.
AU - Takahashi, T.
AU - Tanaka, T.
AU - Tanaka, Y.
AU - Thayer, J. B.
AU - Thompson, D. J.
AU - Tibaldo, L.
AU - Torres, D. F.
AU - Tosti, G.
AU - Tramacere, A.
AU - Uchiyama, Y.
AU - Usher, T. L.
AU - Vasileiou, V.
AU - Venter, C.
AU - Vilchez, N.
AU - Vitale, V.
AU - Waite, A. P.
AU - Wallace, E.
AU - Wang, P.
AU - Winer, B. L.
AU - Wood, K. S.
AU - Ylinen, T.
AU - Ziegler, M.
PY - 2009
Y1 - 2009
N2 - 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) ×10-7 photon cm-2 s-1, with a cutoff at 2.1 ± 0.3(stat) 1.1(syst) GeV and photon index Γ = 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.
AB - 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) ×10-7 photon cm-2 s-1, with a cutoff at 2.1 ± 0.3(stat) 1.1(syst) GeV and photon index Γ = 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.
KW - Binaries: close
KW - Gamma rays: observations
KW - Stars: variables: other
KW - X-rays: binaries
KW - X-rays: individual (LS 5039)
UR - http://www.scopus.com/inward/record.url?scp=77949528567&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77949528567&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/706/1/L56
DO - 10.1088/0004-637X/706/1/L56
M3 - Article
AN - SCOPUS:77949528567
VL - 706
SP - L56-L61
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1 PART 2
ER -