X-Ray Observations of IRAS Selected Seyfert Galaxies and Obscuration of the Broad-Line Region
Abstract
We compare the infrared, optical emission-line, and X-ray properties of four IRAS selected Seyfert galaxies with those of a hard X-ray sample of active galactic nuclei (AGN). For three of the four galaxies the properties are consistent with the objects in the X-ray sample. The anomalous IRAS Seyfert appears to be about 10 times underluminous in hard X-rays. Using a new method involving correlations between Balmer decrement and L_X_/Hβ we show that the average reddening law appropriate to the hard X-ray sample of AGN is similar to that measured in our Galaxy. By deriving an average intrinsic ratio of L_X_/Hβ we measure the average unreddened Hα to Hβ ratio in the broad-line region to be 3.5.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1988
- DOI:
- 10.1086/165935
- Bibcode:
- 1988ApJ...324..767W
- Keywords:
-
- Broadband;
- Infrared Astronomy Satellite;
- Radio Occultation;
- Seyfert Galaxies;
- X Ray Spectroscopy;
- Active Galactic Nuclei;
- Balmer Series;
- H Alpha Line;
- H Beta Line;
- Interstellar Extinction;
- Astrophysics;
- GALAXIES: SEYFERT;
- GALAXIES: X-RAYS