Comparing AGN broad- and narrow-line regions

Details Comparing AGN broad- and narrow-line regions Comparing AGN broad- and narrow-line regions

2004-04-14

arxiv.org/abs/astro-ph/0404278v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, to appear in the proceedings of "The Interplay among Black Holes, Stars and ISM in Galactic Nuclei", IAU 22

Scientific paper

10.1017/S1743921304002340

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.

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