Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-07-27
Astrophys.J. 456 (1996) 466
Astronomy and Astrophysics
Astrophysics
AASTeX, 13 pages. Text only. PostScript tables and figures available at ftp://eggneb.astro.ucla.edu/pub/rush/papers/, named rm
Scientific paper
10.1086/176672
(I) We observed eight Seyfert~2s and two X--ray--weak Seyfert~1/QSOs with the ROSAT PSPC, and one Seyfert~2 with the ROSAT HRI. These targets were selected from the Extended 12\um\ Galaxy Sample. (II) Both Seyfert~1/QSOs vary by factors of 1.5---2. The photon indices steepen in the more luminous state, consistent with the variability being mainly due to the softest X--rays, which are confined to a size of less than a parsec. (III) Both the Seyfert~2s and Seyfert~1/QSOs are best fit with a photon index of $\Gamma\sim3$, which is steeper than the canonical value of $\Gamma\sim1.7$ measured for X--ray--strong Seyferts by ROSAT and at higher energies. Several physical explanations are suggested for the steeper slopes of X--ray--weak objects. (IV) We observed one Seyfert~2, NGC~5005, with the ROSAT HRI, finding about 13\% of the soft X--rays to come from an extended component. This and other observations suggest that different components to the soft X--ray spectrum of some, if not all, X--ray--weak Seyferts may come from spatially distinct regions.
Malkan Matthew A.
Rush Brian
No associations
LandOfFree
The Soft-X-Ray Spectral Shape of X-Ray-Weak Seyferts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Soft-X-Ray Spectral Shape of X-Ray-Weak Seyferts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Soft-X-Ray Spectral Shape of X-Ray-Weak Seyferts will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-551994