Obscuration in the host galaxies of soft X-ray-selected Seyfert nuclei

被引：33

作者：

Simcoe, R ^{[1
]}

McLeod, KK ^{[1
]}

Schachter, J ^{[1
]}

Elvis, M ^{[1
]}

机构：

[1] SMITHSONIAN ASTROPHYS OBSERV, CAMBRIDGE, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 489卷 / 02期

关键词：

galaxies; ISM; nuclei; Seyfert; structure; X-rays;

D O I：

10.1086/304819

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We define a new sample of 96 low-redshift (z < 0.1), soft X-ray-selected Seyfert galaxies from the catalog of the Einstein Slew Survey. We probe the geometry and column depth of obscuring material in the host-galaxy disks using galactic axial ratios determined mainly from the Digitized Sky Survey. The distribution of host-galaxy axial ratios clearly shows a bias against edge-on spirals, which confirms the existence of a geometrically thick layer of obscuring material in the host-galaxy planes. Soft X-ray selection recovers some of the edge-on objects missed in UV and visible surveys but still results in 30% incompleteness for type 1 nuclei. We speculate that thick rings of obscuring material such as the ones we infer for these Seyfert galaxies might be commonly present in early-type spirals, sitting at the inner Lindblad resonances of the nonaxisymmetric potentials of the host galaxies.

引用

页码：615 / 622

页数：8

共 43 条

[11] THE EINSTEIN SLEW SURVEY [J].