Discovery of a Seyfert 1 galaxy with an unusually soft X-ray spectrum
Abstract
A newly-discovered Seyfert 1 galaxy, E1615+061, is identified with the bright, soft X-ray source H1613+06. The object possesses a steep X-ray spectrum, an energy index lower than 2.0, and is similar to BL Lac objects' variable soft X-ray components. Such components may be present at times in all compact extragalactic X-ray emitters, and could represent high-luminosity states of the accretion disks around the supermassive black holes that are the underlying power sources. Many of the presently unidentified, bright, soft X-ray sources at high galactic latitudes may fall into the category of these compact extragalactic objects.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1981
- DOI:
- 10.1086/159489
- Bibcode:
- 1981ApJ...251..501P
- Keywords:
-
- Astronomical Spectroscopy;
- Galactic Radiation;
- Seyfert Galaxies;
- X Ray Sources;
- Energy Spectra;
- Heao 1;
- Proportional Counters;
- Spaceborne Astronomy;
- Astronomy