Ultrasoft Components in X-Ray Active Galactic Nuclei / AGN
Abstract
A survey of the ultrasoft X-ray sources in the data base of the Einstein Observatory's imaging proportional counter revealed a large number of active galactic nuclei (AGN) that have ultrasoft X-ray components. The survey contains the highest redshift objects for which soft components are known. Findings on the ultrasoft AGN are summarized. The selection criteria and spectral parameters for the AGN are described. Some of the implications of the high-redshift sources for possible emission mechanisms and luminosity-enhancing processes are considered.
- Publication:
-
Two Topics in X-Ray Astronomy, Volume 1: X Ray Binaries. Volume 2: AGN and the X Ray Background
- Pub Date:
- November 1989
- Bibcode:
- 1989ESASP.296..843C
- Keywords:
-
- Active Galactic Nuclei;
- Red Shift;
- Spectral Signatures;
- Spectrum Analysis;
- X Ray Spectra;
- Heao 2;
- Imaging Techniques;
- Proportional Counters;
- Radio Sources (Astronomy);
- Stellar Luminosity;
- X Ray Sources;
- Astronomy