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The radio counterpart of the likely TeV binary HESSJ0632+057

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Hinton,  J. A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Aharonian,  F. A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Dubus,  G.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Funk,  S.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Skilton, J. L., Pandey-Pommier, M., Hinton, J. A., Cheung, C. C., Aharonian, F. A., Brucker, J., et al. (2009). The radio counterpart of the likely TeV binary HESSJ0632+057. Monthly Notices of the Royal Astronomical Society, 399(1), 317-322. doi:http://dx.doi.org/10.1111/j.1365-2966.2009.15272.x.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-744D-6
Abstract
The few known γ-ray binary systems are all associated with variable radio and X-ray emission. The TeV source HESSJ0632+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 Giant Metrewave Radio Telescope (GMRT) and Very Large Array (VLA) observations in 2008 June-September 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, α, of ~0.6. In the VLA data there is significant flux variability on ~month time-scales around the mean flux density of ~0.3mJy. These radio properties (and the overall spectral energy distribution) are consistent with an interpretation of HESSJ0632+057 as a lower power analogue of the established γ-ray binary systems.