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Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057

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arxiv 0905.3139 v1 pith:HZ2MRSTR submitted 2009-05-19 astro-ph.HE

Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057

VERITAS Collaboration: V. A. Acciari , E. Aliu , T. Arlen , M. Beilicke , W. Benbow , D. Boltuch , S. M. Bradbury , J. H. Buckley
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V. Bugaev K. Byrum A. Cannon A. Cesarini Y. C. Chow L. Ciupik P. Cogan R. Dickherber C. Duke T. Ergin A. Falcone S. J. Fegan J. P. Finley G. Finnegan P. Fortin L. Fortson A. Furniss K.Gibbs G. H. Gillanders J. Grube R. Guenette G. Gyuk D. Hanna J. Holder D. Horan C. M. Hui T. B. Humensky A. Imran P. Kaaret N. Karlsson M. Kertzman D. Kieda J. Kildea A. Konopelko H. Krawczynski F. Krennrich M. J. Lang S. LeBohec G. Maier A. McCann M. McCutcheon J. Millis P. Moriarty R. Mukherjee R. A. Ong A. N. Otte D. Pandel J. S. Perkins D. Petry M. Pohl J. Quinn K. Ragan L. C. Reyes P. T. Reynolds H. J. Rose M. Schroedter G. H. Sembroski A. W. Smith D. Steele M. Theiling J. A. Toner A. Varlotta V. V. Vassiliev S. Vincent R. G. Wagner S. P. Wakely J. E. Ward T. C. Weekes A. Weinstein T. Weisgarber D. A. Williams S. Wissel M. Wood
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keywords hessj0632gamma-rayx-rayfluxobservationsveritasbeen
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HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hours in 2006, 2008 and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data. The non-detection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with Swift XRT reveal a factor of 1.8+-0.4 higher flux in the 1-10 keV range than earlier X-ray observations of HESS J0632+057. The variability in the gamma-ray and X-ray fluxes supports interpretation of the ob ject as a gamma-ray emitting binary.

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