X-ray observations of IRAS selected Seyfert galaxies and obscuration of the broad-line region

Journal Article · Thu Dec 31 23:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165935· OSTI ID:5339435

Ward, M J; Done, C; Fabian, A C; Tennant, A F; Shafer, R A

The IR, optical emission-line, and X-ray properties of four IRAS selected Seyfert galaxies are compared with those of a hard X-ray sample of 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)/H-beta it is shown that the average reddening law appropriate to the hard X-ray sample of AGN is similar to that measured in the Galaxy. By deriving an average intrinsic ratio of L(X)/H-beta, the average unreddened H-alpha to H-beta ratio in the broad-line region is measured to be 3.5. 29 references.

• Research Organization: Washington Univ., Seattle (USA); Cambridge Univ. (England); ESA, Space Science Dept., Noordwijk (Netherlands)
• OSTI ID: 5339435
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 324; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BALMER LINES
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC RADIATION
GALAXIES
GALAXY NUCLEI
HARD X RADIATION
INFRARED SPECTRA
IONIZING RADIATIONS
MILKY WAY
RADIATIONS
SEYFERT GALAXIES
SPECTRA
VISIBLE SPECTRA
X RADIATION
X-RAY SPECTRA