Active galactic nuclei with ultrasoft X-ray emission

Details Active galactic nuclei with ultrasoft X-ray emission Active galactic nuclei with ultrasoft X-ray emission

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...81..661c&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 81, no. 2, Aug. 1992, p. 661-681. Research supported by NASA.

Astronomy and Astrophysics

Astronomy

32

Active Galactic Nuclei, Emission Spectra, Quasars, Seyfert Galaxies, X Ray Sources, Astronomical Models, Color-Color Diagram, Gravitational Lenses, Light Curve, Radio Emission, Relativistic Electron Beams, Ultraviolet Astronomy

Scientific paper

The discovery of a class of AGN with clearly distinguishable soft X-ray components below 0.5 keV is reported. These AGN were detected through equivalent hydrogen column densities that are less than a few times 10 exp 20/sq cm. At least three kinds of AGN comprise this sample: low-redshift quasars and Seyfert galaxies that have only ultrasoft emission (these objects lack detectable hard X-ray emission); AGN that have both ultrasoft as well as hard X-ray components; and high-redshift quasars whose soft emission may originate, as proposed for the lensed quasar 0957 + 561, in an extended source or, alternately, in a source that is luminosity-enhanced due to relativistic beaming.

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