The radio counterpart of the likely TeV binary HESS J0632+057

Abstract

The few known gamma-ray binary systems are all associated with variable radio and X-ray emission. The TeV source HESS J0632+057, apparently associated with the Be star MWC148, is plausibly a new member of this class. Following the identification of a variable X-ray counterpart to the TeV source we conducted GMRT and VLA observations in June-September 2008 to search for the radio counterpart of this object. A point-like radio source at the position of the star is detected in both 1280 MHz GMRT and 5 GHz VLA observations, with an average spectral index, alpha, of ~0.6. In the VLA data there is significant flux variability on ~month timescales around the mean flux density of ~0.3 mJy. These radio properties (and the overall spectral energy distribution) are consistent with an interpretation of HESS J0632+057 as a lower power analogue of the established gamma-ray binary systems.

Accepted for publication in MNRAS (7 pages, 4 figures, 1 table)

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Cited by in corpus (31)

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• HD 259440: The Proposed Optical Counterpart of the gamma-ray Binary HESS J0632+057
• Thermal X-ray Emission from the Shocked Stellar Wind of Pulsar Gamma-ray Binaries
• The Be Star HD 215227: A Candidate Gamma-ray Binary
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• Swift, XMM-Newton, and NuSTAR observations of PSR J2032+4127/MT91 213
• Probing the Nature of the unidentified TeV Gamma-ray source HESS J0632+057 with Swift
• Detection of VHE γ-rays from HESS J0632+057 during the 2011 February X-ray outburst with the MAGIC Telescopes
• Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array
• GeV detection of HESS J0632+057
• Observation of the gamma-ray binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS telescopes
• Discovery of a variable X-ray counterpart to HESS J1832-093: A new gamma-ray binary?
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• Swift observations of 1FGL J1018.6-5856
• The missing GeV γ-ray binary: Searching for HESS J0632+057 with Fermi-LAT
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• Monte-Carlo Simulations of Radio Emitting Secondaries in Gamma-Ray Binaries
• Very high energy Fermi/LAT detection of HESS J0632+057
• A search for Very High Energy gamma-ray emission from Scorpius X-1 with the MAGIC telescopes
• Decade-long X-ray observations of HESS J0632+057
• A multi-wavelength study of the gamma-ray binary candidate HESS J1832-093
• Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
• Possible TeV $\gamma$-ray binary origin of HESS J1828-099
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