Astron. Astrophys. 349, 475-484 (1999)

4. Search for a radio counterpart to SVS16/X11

The region around SVS16 contains several radio sources. This region was also studied by Snell & Bally (1986), and more recently by Rodríguez et al. (1999). In our data, no radio counterpart to X11 was found within the positional errors. To make a deeper search for a counterpart, the four available maps were coadded. The combined map is reproduced in Fig. 3. The position of the X-ray source (X11) is marked. The RMS of the background of the coadded map was found to be approximately 10 µJy. No strong source was seen at or close to the position of SVS16 or X11. The strongest source seen in the coadded map near the position of X11 had peak flux 25 µJy and is not significant. We therefore place a upper limit of 3010 µJy on the radio source, corresponding to erg s^-1 Hz^-1.

Fig. 3. Combination of four maps of the SVS16 region. Two 4.9GHz and two 8.4GHz maps have been averaged. Each map was taken with the array in C-configuration. The position of the X-ray source is marked with a cross, the size of which is 5". The two triangles mark the position of the east and west components of SVS16. The radio continuum sources from Snell & Bally (1986) are labelled (source 4, to the left, and source 7, to the right). The lowest contour level is twice the measured background RMS of 10 µJy. The strongest radio emission peak within the positional uncertainty of X11 had peak flux measured as 2510 µJy, and is not a significant detection. Furthermore, its position is not consistent with the position of SVS16.

© European Southern Observatory (ESO) 1999

Online publication: September 2, 1999
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