NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T12:49:15 PDT
Help | Comment | NED Home

For refcode 1997ApJ...489..615S:
Retrieve 96 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1997ApJ...489..615S Obscuration in the Host Galaxies of Soft X-Ray-selected Seyfert Nuclei ROBERT SIMCOE, K. K. MCLEOD, JONATHAN SCHACHTER, AND MARTIN ELVIS Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138 jschachter@cfa.harvard.edu, melvis@cfa.harvard.edu Received 1997 April 7; accepted 1997 June 24 ABSTRACT 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. Subject headings: galaxies: ISM-galaxies: nuclei-galaxies: Seyfert- galaxies: structure-X-rays: galaxies
Retrieve 96 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home