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HESS J0632+057 : A new gamma-ray binary?
Hinton J.A., Skilton J.L., Funk S., Brucker J., Aharonian F.A. et al
The Astrophysical Journal / The Astrophysical Journal Letters 690 (2008) L101-L104 - http://hal.archives-ouvertes.fr/hal-00430148
Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
Physique/Astrophysique/Phénomènes cosmiques de haute energie
HESS J0632+057 : A new gamma-ray binary?
J. A. Hinton, J. L. Skilton, S. Funk, J. Brucker, F. A. Aharonian, G. Dubus, Armand Fiasson ()1, Yves Gallant ()1, W. Hofmann, Alexandre Marcowith ()1, O. Reimer
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
CNRS : UMR5207 – IN2P3 – Université Montpellier II - Sciences et techniques
Bât 13- 1er Et. - CC 070 Place Eugène Bataillon 34095 MONTPELLIER CEDEX 5
The High Energy Stereoscopic System (HESS) survey of the Galactic plane hasestablished the existence of a substantial number (~40) of Galactic TeVgamma-ray sources, a large fraction of which remain unidentified. HESSJ0632+057 is one of a small fraction of these objects which is point-like innature(<2' rms), and is one of only two point-like sources that remainunidentified. Follow-up observations of this object with XMM-Newton haverevealed an X-ray source coincident with the TeV source and with the massivestar MWC 148, of the spectral type B0pe. This source exhibits a hard spectrum,consistent with an absorbed power law with Gamma = 1.26 +/- 0.04, and showssignificant variability on hour timescales. We discuss this spatial coincidenceand the implied spectral energy distribution of this object and argue that itis likely a new gamma-ray binary system with a close resemblance to the threeknown members of this class, and in particular to LS I +61 303. Further X-ray,radio and optical observations of this system are needed to firmly establishHESS J0632+057 as a new member of this rare class of Galactic objects.

The Astrophysical Journal / The Astrophysical Journal Letters
Articles dans des revues avec comité de lecture

X-rays: binaries

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