On the relative number of Seyfert 1 and Seyfert 2 galaxies and the openingangle of dust torus

Authors
Citation
Hm. Tovmassian, On the relative number of Seyfert 1 and Seyfert 2 galaxies and the openingangle of dust torus, ASTRON NACH, 322(2), 2001, pp. 87-91
Citations number
22
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMISCHE NACHRICHTEN
ISSN journal
00046337 → ACNP
Volume
322
Issue
2
Year of publication
2001
Pages
87 - 91
Database
ISI
SICI code
0004-6337(2001)322:2<87:OTRNOS>2.0.ZU;2-8
Abstract
It is shown that the samples of Seyfert galaxies used to study different pa rameters of Seyferts are largely incomplete. The way of estimation of the n umber of the missed, not detected Seyferts is proposed. It is based on the assumption that distribution of inclinations of Seyferts should be similar to that of spiral galaxies. Addition of the estimated number of the missed Seyferts allows to deduce more correct value of the ratio of numbers of Sy2 s to Sy1s, N2/N1. The more real value of the ratio N2/N1 is the one deduced by using the results of counts of bright, nearby Seyferts, and is equal to similar to 4.0. The opening angle of the dust torus is similar to 76 degre es.