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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 ; V. Bugaev ; K. Byrum ; A. Cannon ; A. Cesarini ; 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 ;
Date:	19 May 2009
Abstract:	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.
Source:	arXiv, 0905.3139
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