Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-08-05
Astronomy and Astrophysics
Astrophysics
17 pages, LaTeX, including 2 Tables and 1 figure. Ap.J. in press
Scientific paper
10.1086/305025
We have selected quasars with X-ray colors suggestive of a low energy cut-off, from the ROSAT PSPC pointed archive. We examine the radio and optical properties of these 13 quasars. Five out of the seven quasars with good optical spectra show associated optical absorption lines, with two having high delta-v candidate systems. Two other cut-off quasars show reddening associated with the quasar. We conclude that absorption is highly likely to be the cause of the X-ray cut-offs, and that the absorbing material associated with the quasars, not intervening along the line-of-sight. The suggestion that Gigahertz Peaked Sources are associated with X-ray cut-offs remains unclear with this expanded sample.
Elvis Martin
Fiore Fabrizio
Giommi Paolo
Padovani Paolo
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