Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 698, Issue 2, Pages L94-L97Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/698/2/L94
Keywords
acceleration of particles; binaries: general; gamma rays: observations; stars: individual (HESS J0632+057, MWC 148)
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Funding
- U. S. Department of Energy
- U. S. National Science Foundation
- Smithsonian Institution
- NSERC in Canada
- Science Foundation Ireland
- STFC
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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 hr 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 nondetection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with the Swift X-Ray Telescope 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 object as a gamma-ray emitting binary.
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