THE SOFT-X-RAY PROPERTIES OF A COMPLETE SAMPLE OF RADIO-SOURCES

We present the soft X-ray (0.1-2.4 keV) properties of a complete sampl e of 88 southern radio sources derived from the Wall & Peacock 2-Jy sa mple, It comprises 68 radio galaxies, 18 quasars and 2 BL Lac objects, Whereas both BL Lac objects and all but one quasar are detected in th e ROSAT All-Sky Survey, the fraction of detected radio galaxies is onl y similar to 60 per cent, For the undetected sources upper limits to t he X-ray flux are given, We confirm the correlation of the soft X-ray luminosity (L(x)) with the core radio luminosity (L(r,core)) for galax ies as well as for quasars using partial correlation analysis, whereas the corresponding correlations between L(x) and L(r,total) are probab ly spurious due to sample selection effects, We also find strong corre lations between L(x) and L(r,core) for both Fanaroff-Riley type I (FR I) and type II galaxies, The broad-line radio galaxies (BLRGs) and the quasars are at the top end of the X-ray luminosity distribution and t he detection rate of these objects generally is higher than that of th e narrow- or weak-lined radio galaxies, This indicates the presence of an anisotropic X-ray component in BLRGs and quasars, as predicted by unified schemes for radio sources.