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Size and properties of the narrow-line region in Seyfert-1 galaxies from spatially-resolved optical spectroscopy by Bennert, Nicola; Jungwiert, Bruno; Komossa, Stefanie; Haas, Martin; Chini, Rolf; ; is a scholarly article available to read on EtoBox.

What is Size and properties of the narrow-line region in Seyfert-1 galaxies from spatially-resolved optical spectroscopy about?

Spatially resolved emission-line spectroscopy is a powerful tool to determine the physical conditions in the narrow-line region (NLR) of active galactic nuclei (AGNs). We recently used optical long-slit spectroscopy to study the NLRs of a sample of six Seyfert-2 galaxies. We have shown that such an approach, in comparison to the commonly used [OIII] narrow-band imaging alone, allows us to probe the size of the NLR in terms of AGN photoionisation. Moreover, several physical parameters of the NLR can be directly accessed. We here apply the same methods to study the NLR of six Seyfert-1 galaxies and compare our results to those of Seyfert-2 galaxies. We employ diagnostically valuable emission-line ratios to determine the physical properties of the NLR, including the core values and radial dependencies of density, ionisation parameter, and reddening. Tracking the radial change of emission-line ratios in diagnostic diagrams allows us to measure the transition between AGN-like and HII-like line excitation, and thus we are able to measure the size of the NLR. In the diagnostic diagrams, we find a transition between line ratios falling in the AGN regime and those typical for HII regions in

Author

Bennert, Nicola; Jungwiert, Bruno; Komossa, Stefanie; Haas, Martin; Chini, Rolf; ;

Published

2006

Language

EN