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On the Relationship Between the Optical Emission-Line and X-ray Luminosities in Seyfert 1 Galaxies by Kraemer, S. B.; George, I. M.; Crenshaw, D. M.; Gabel, J. R. is a scholarly article available to read on EtoBox.

What is On the Relationship Between the Optical Emission-Line and X-ray Luminosities in Seyfert 1 Galaxies about?

We have explored the relationship between the [O III] $\lambda$5007 and the 2--10 keV luminosities for a sample of Broad- and Narrow-Line Seyfert 1 galaxies (BLSy1 and NLSy1, respectively). We find that both types of Seyferts span the same range in luminosity and possess similar [O III]/X-ray ratios. The NLSy1s are more luminous than BLSy1s, when normalized to their central black hole masses, which is attributed to higher mass accretion rates. However, we find no evidence for elevated [O III]/X-ray ratios in NLSy1s, which would have been expected if they had excess EUV continuum emission compared to BLSy1s. Also, other studies suggest that the gas in narrow-line regions (NLR) of NLSy1s and NLSy1s span a similar range in ionization, contrary to what is expected if those of the former are exposed to a stronger flux of EUV radiation. The simplest interpretation is that, like BLSy1s, a large EUV bump is not present in NLSy1s. However, we show that the [OIII]/X-ray ratio can be lowered as a result of absorption of the ionizing continuum by gas close to the central source, although there is no evidence that intrinsic line-of-sight absorption is more common among NLSy1s, as would be expec

Author

Kraemer, S. B.; George, I. M.; Crenshaw, D. M.; Gabel, J. R.

Published

2004

Language

EN