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The Astrophysical Journal / The Astrophysical Journal Letters 690 (2008) L101-L104
HESS J0632+057 : A new gamma-ray binary?
J. A. Hinton, J. L. Skilton, S. Funk, J. Brucker, F. A. Aharonian, G. Dubus, Armand Fiasson1, Yves Gallant1, W. Hofmann, Alexandre Marcowith1, O. Reimer

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.
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie

Physique/Astrophysique/Phénomènes cosmiques de haute energie
X-rays: binaries
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