Optical properties of active galaxies with ultra-soft X-ray spectra

Details Optical properties of active galaxies with ultra-soft X-ray spectra Optical properties of active galaxies with ultra-soft X-ray spectra

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..589p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 4, June 15, 1992, p. 589-623. Research support

Astronomy and Astrophysics

Astronomy

142

Active Galactic Nuclei, Galactic Radiation, Line Spectra, Optical Emission Spectroscopy, Spectrum Analysis, X Ray Spectra, Accretion Disks, Luminosity, X Ray Astronomy

Scientific paper

An examination of optical properties in a sample of 53 AGNs exhibiting ultrasoft X-ray excess has led to the determination of optical spectra for 27, which were then measured for continuum and line parameters. A comparison of these Ultrasoft Survey (USS) H-beta FWHM distribution with other X-ray selected samples confirms that the permitted lines of the USS AGNs are biased to narrow widths, due either to observation of a face-on broad-line region, or to that region's lying farther away from the central source than for other AGNs. A comparison is conducted of optical line and continuum properties of the USS AGN with their separate hard and soft X-ray component luminosities and with the optical properties of other samples.

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