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| Titre : |
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HESS J0632+057 : A new gamma-ray binary? |
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| Auteur(s) : |
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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 |
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| Laboratoire : |
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| Résumé : |
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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. |
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Langue du texte
intégral : |
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Anglais |
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Date de production,
écriture : |
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18/12/2008 |
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| Journal : |
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The Astrophysical Journal / The Astrophysical Journal Letters |
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| Audience : |
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internationale |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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| Date de publication : |
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15/12/2008 |
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| Volume : |
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690 |
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| Page, identifiant, ... : |
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L101-L104 |
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| Mots Clés : |
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X-rays: binaries |
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| Référence interne : |
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08-092 |
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