Mathematics – Probability
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.1320b&link_type=abstract
American Astronomical Society, HEAD meeting #12, #13.20
Mathematics
Probability
Scientific paper
HESS J0632+057 is a variable, point-like source of Very High Energy (> 100 GeV) gamma-rays located in the Galactic plane. It is positionally coincident with a Be star, it is a variable radio and X-ray source, has a hard X-ray spectrum, and has low radio flux. These properties suggest that the object may be a member of the rare class of TeV/X-ray binary systems. A definitive confirmation of this would be the detection of a periodic orbital modulation of the flux at any wavelength. We have obtained Swift X-ray telescope observations of the source from MJD 54857 to 55690 (Jan. 2009 - May 2011) to test the hypothesis that HESS J0632+057 is an X-ray/TeV binary. We show that these data exhibit flux modulation with a period of 320 ± 5 days, and we evaluate the significance of this period by calculating the null hypothesis probability, allowing for stochastic flaring. This periodicity establishes the binary nature of HESS J0632+057. We also report the spectral energy distribution, which will be used to constrain geometry and models of gamma-ray generation in the system.
Bongiorno Steve D.
Falcone Abe D.
Gehrels Neil
Grube Jeff
Hinton Jim A.
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