NASA NTRS · 19920066721
Active galactic nuclei with ultrasoft X-ray emission
Abstract
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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Cordova, F. A., Kartje, J. F., Thompson, R. J., Jr., Mason, K. O., Puchnarewicz, E. M., Harnden, F. R., Jr.. 1992-08-01. Active galactic nuclei with ultrasoft X-ray emission. https://ntrs.nasa.gov/citations/19920066721
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