Comparing AGN broad- and narrow-line regions
Abstract
We compare recent HST observations of Seyfert and quasar NLRs and find that type-2 AGNs follow a relation consistent with that expected for a distribution of gas ionized by a central source R(NLR,2) \propto L^{0.32 +/- 0.05}, while type-1 objects are fit with a steeper slope of 0.55 +/- 0.05. The latter is comparable to the scaling found for the BLR size with continuum luminosity (slope: 0.5-0.7). Therefore, we investigate what we can learn about the BLR size if the NLR size is only determined by the AGN luminosity. We find that NLR and BLR size are related linearly following R(BLR) \propto R(NLR,1)^{0.88 +/- 0.1}. This relation can be used to estimate BH masses.
Keywords
Cite
@article{arxiv.astro-ph/0404278,
title = {Comparing AGN broad- and narrow-line regions},
author = {Nicola Bennert and Heino Falcke and Yuri Shchekinov and Andrew S. Wilson},
journal= {arXiv preprint arXiv:astro-ph/0404278},
year = {2009}
}
Comments
2 pages, 1 figure, to appear in the proceedings of "The Interplay among Black Holes, Stars and ISM in Galactic Nuclei", IAU 222, eds. Th. Storchi Bergmann, L.C. Ho, and H.R. Schmitt