Discovery of a double radio source associated with Cygnus X-3

We report the discovery of a weak (∼4.5 mJy), arcsecond-scale double radio source located symmetrically with respect to the compact variable radio core of Cyg X-3. The double radio source has a separation of about 6 arcsec and is roughly aligned with the elongation direction of the sub-arcsec core from Very-Long-Baseline Interferometry observations. The observations suggest a generic connection between the inner and outer radio structures, and implies that the (poor) collimation evident in the large-scale double source originates near the binary system. (author)