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

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

2009-05-19

arxiv.org/abs/0905.3139v1

Astrophys.J.698:L94-L97,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

8 pages, 3 figures, Accepted for publication in The Astrophysical Journal

Scientific paper

10.1088/0004-637X/698/2/L94

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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