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Title:
Line profiles and the kinematics of the narrow-line region in Seyfert galaxies
Authors:
De Robertis, M. M.; Shaw, Richard A.
Affiliation:
AA(York University, North York, Canada), AB(Lick Observatory, Santa Cruz, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 421-433. Research supported by NSERC. (ApJ Homepage)
Publication Date:
01/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
KINEMATICS, LINE SPECTRA, NARROWBAND, SEYFERT GALAXIES, ABSORPTION SPECTRA, CHARGE COUPLED DEVICES, EMISSION SPECTRA, SIGNAL TO NOISE RATIOS, SPECTRAL LINE WIDTH
DOI:
10.1086/168251
Bibliographic Code:
1990ApJ...348..421D

Abstract

High signal-to-noise ratio and long-slit CCD spectra at about 100 km/sec resolution have been obtained for six high-ionization Seyfert galaxies. By subtracting the stellar absorption features with the aid of continuum templates, and using deblending techniques, the asymmetry indices of a number of optical emission-line profiles were measured, spanning a wide range in both ionization potential and critical density in each galaxy. The fundamental problem of the cloud-motion direction in the narrow-line region (NLR) has been studied, using these measurements and on the assumption that the preponderance of blueward profile asymmetries requires radial motion as well as a source of extinction. Simple and spherically symmetric NLR simulations are performed to demonstrate that infall and outflow models can be distinguished by comparing asymmetry indices as a function of ionization potential and critical density.

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