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.
Keywords
Cite
@article{arxiv.0906.3411,
title = {The radio counterpart of the likely TeV binary HESS J0632+057},
author = {J. L. Skilton and M. Pandey-Pommier and J. A. Hinton and C. C. Cheung and F. A. Aharonian and J. Brucker and G. Dubus and A. Fiasson and S. Funk and Y. A. Gallant and A. Marcowith and O. Reimer},
journal= {arXiv preprint arXiv:0906.3411},
year = {2015}
}
Comments
Accepted for publication in MNRAS (7 pages, 4 figures, 1 table)