X-RAY SPECTRAL SURVEY OF WGACAT QUASARS - II - OPTICAL AND RADIO PROPERTIES OF QUASARS WITH LOW-ENERGY X-RAY CUTOFFS

We have selected quasars with X-ray colors suggestive of a low-energy cutoff, from the ROSAT Position Sensitive Proportional Counter (PSPC) pointed observations archive. We examine the radio and optical propert ies of these 13 quasars. Five out of the seven quasars with good optic al spectra show associated optical absorption lines, with two having h igh Av candidate systems. Two other cutoff quasars show reddening asso ciated with the quasar. We conclude that absorption is highly likely t o be the cause of the X-ray cutoffs, and that the absorbing material i s associated with the quasars, not intervening along the line of sight . The suggestion that gigahertz peaked sources are associated with X-r ay cutoffs remains unclear with this expanded sample.