X-ray and optical observations of MCG -6-30-15.
Abstract
X-ray and optical observations of MCG-6-30-15 show it to have an X-ray luminosity of Lχ ≈ 1043 ergs s-1 and an X-ray-optical ratio of Lχ/Lopt ≈ 3. We confirm the original classification of a Type 1 Seyfert with FWZI (Hβ) ≳ 6500 km s-1. We derive a power law from the infrared and optical flux (α ≈ 2) which is in good agreement with the optical continuum power law. If the power law is extrapolated to ionizing UV, we find insufficient UV radiation to excite the Balmer lines, implying either collisional excitation or more UV radiation than expected from the power law. The Balmer decrement is consistent with either an optical absorption Aυ ≈ 1.7 or, more likely, collisional excitation.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1980
- DOI:
- 10.1086/157883
- Bibcode:
- 1980ApJ...237..414P
- Keywords:
-
- Seyfert Galaxies;
- Spaceborne Astronomy;
- Ultraviolet Radiation;
- X Ray Sources;
- Balmer Series;
- Galactic Nuclei;
- Line Spectra;
- Luminous Intensity;
- Astronomy