Discovery of a Seyfert 1 galaxy with an unusually soft X-ray spectrum

Details Discovery of a Seyfert 1 galaxy with an unusually soft X-ray spectrum Discovery of a Seyfert 1 galaxy with an unusually soft X-ray spectrum

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..501p&link_type=abstract

Astrophysical Journal, Part 1, vol. 251, Dec. 15, 1981, p. 501-507.

Astronomy and Astrophysics

Astronomy

48

Astronomical Spectroscopy, Galactic Radiation, Seyfert Galaxies, X Ray Sources, Energy Spectra, Heao 1, Proportional Counters, Spaceborne Astronomy

Scientific paper

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.

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