X-RAY-PROPERTIES OF HEAD-TAIL RADIO-SOURCES IN CLUSTERS OF GALAXIES

From ROSAT imaging data we have detections and upper limits for a samp le of 26 tailed radio sources in clusters of galaxies, taken mostly fr om the sample of O'Dea & Owen. 16 sources were detected, and all of th ese were unresolved in the ROSAT PSPC images. The sources bright enoug h to perform X-ray spectral analysis have power-law indices similar to BL Lacs and Seyfert galaxies. We find that there is a highly signific ant correlation between the core radio flux density and the X-ray flux , but only a weak correlation between the total radio flux density and the X-ray flux. The trend is similar to that found in earlier Einstei n studies of 3C radio galaxies, and more recently with ROSAT. The resu lt adds an additional constraint to models of the unification of BL La c objects with FR I radio sources. Also, this result indicates that th e observed enhanced X-ray emission near tailed sources is more likely to be a result of nuclear emission rather than substructure in the ext ended cluster gas.