Optical properties of ultra-soft X-ray AGN

Details Optical properties of ultra-soft X-ray AGN Optical properties of ultra-soft X-ray AGN

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..204p&link_type=abstract

Testing the AGN paradigm. AIP Conference Proceedings, Volume 254, pp. 204-207 (1992).

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Scientific paper

We present optical data for an unique sample of 53 ultra-soft X-ray AGN, the first of its kind to be selected by the strength of the 0.25 keV X-ray emission. A striking characteristic of the sample is the high proportion of narrow-line objects it contains; we also find that the permitted lines are weak. In the context of accretion disk models this favors geometrically thick disks over thin. Alternatively, the BLR may lie further from the black hole than for other AGN. The overall spectral distribution can also be well reproduced by the cool clouds model of Guilbert and Rees. The sample includes a number of objects which have strong FeII lines, but weak hard X-ray emission.

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