HESS J0632+057 : A new gamma-ray binary?

Abstract : 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.
keyword : X-rays: binaries
Document type :
Journal articles
The Astrophysical Journal / The Astrophysical Journal Letters, 2008, 690, pp.L101-L104. <10.1088/0004-637X/690/2/L101>


https://hal.archives-ouvertes.fr/hal-00430148
Contributor : Logiciel Aigle <>
Submitted on : Thursday, November 5, 2009 - 6:04:44 PM
Last modification on : Thursday, November 5, 2009 - 6:04:44 PM

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J. A. Hinton, J. L. Skilton, S. Funk, J. Brucker, F. A. Aharonian, et al.. HESS J0632+057 : A new gamma-ray binary?. The Astrophysical Journal / The Astrophysical Journal Letters, 2008, 690, pp.L101-L104. <10.1088/0004-637X/690/2/L101>. <hal-00430148>

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