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2012MNRAS.427.1266V - Mon. Not. R. Astron. Soc., 427, 1266-1283 (2012/December-1)
Spectral properties of the narrow-line region in Seyfert galaxies selected from the SDSS-DR7.
VAONA L., CIROI S., DI MILLE F., CRACCO V., LA MURA G. and RAFANELLI P.
Abstract (from CDS):
2153 Seyfert 2 and 521 Intermediate-type Seyfert spectra were selected from Sloan Digital Sky Survey Data Release 7 (SDSS-DR7) with a diagnostic diagram based on the oxygen emission-line ratios. All the emission lines, broad components included, were measured by means of a self-developed code, after the subtraction of the stellar component. Physical parameters, such as internal reddening, ionization parameter, temperature, density, gas and stellar velocity dispersion were determined for each object. Furthermore, we estimated mass and radius of the NLR, kinetic energy of the ionized gas and black hole accretion rate.
From the emission-line analysis and the estimated physical properties, it appears that the NLR is similar in Seyfert 2 and Intermediate-Seyfert galaxies. The only differences, lower extinction, gas kinematics in general not dominated by the host galaxy gravitational potential and higher percentage of [OIII]λ5007 blue asymmetries in Intermediate-Seyfert, can be ascribed to an effect of inclination of our line of sight with respect to the torus axis.
Abstract Copyright: © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Journal keyword(s): methods: statistical - techniques: spectroscopic - galaxies: Seyfert
Simbad objects: 2
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