Ariel V X-ray observations of two type I Seyfert galaxies
Abstract
X-ray spectra of the type I Seyfert galaxies ESO 012-G21 and Markarian 464 obtained by the proportional counter spectrometer on board Ariel 5 are presented. ESO 012-G21 is found to have an X-ray luminosity of 1.5 x 10 to the 44th erg/sec at a redshift of 0.03 and a Hubble constant of 50 km/sec per Mpc, and is identified with the X-ray source 3U 0055-79. An X-ray luminosity varying within a year from 3 to 0.9 x 10 to the 44th erg/sec has been obtained for Mkn 464, and a column of absorbing of around 2.5 x 10 to the 23 H atoms/sq cm has been detected in front of the source. Evidence for a low energy cut-off in the X-ray spectrum of Mkn 464 is also noted.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- July 1980
- DOI:
- 10.1093/mnras/192.1.1P
- Bibcode:
- 1980MNRAS.192P...1H
- Keywords:
-
- Seyfert Galaxies;
- Spaceborne Astronomy;
- X Ray Sources;
- X Ray Spectra;
- Ariel 5 Satellite;
- Hubble Constant;
- Radiant Flux Density;
- Red Shift;
- Stellar Luminosity;
- Astrophysics