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| Paper: |
Structure of ionized gas around AGN |
| Volume: |
290, Active Galactic Nuclei: from Central Engine to Host Galaxy |
| Page: |
203 |
| Authors: |
Falcke, H.; Bennert, N.; Schulz, H.; Wilson, A. S.; Wills, B. J. |
| Abstract: |
While structure and size of the narrow-line region (NLR) of Seyfert galaxies has been the subject of many detailed studies, surprisingly little is known about the NLR in quasars. We have therefore observed the NLR in a flux-limited sample of the seven brightest radio-quiet PG (or BQS) quasars (z lower than 0.5) with the WFPC2 camera onboard the Hubble Space Telescope. Linear ramp filters were used to image the [OIII] line emission with 0.1 arcsec resolution. We find that the NLRs have typical extents of only one-two arcseconds. A few quasars show compact filamentary structure known from Seyfert NLRs which are related to radio outflows. Most interestingly, we find that the size of the NLR seems to scale proportionally to the square root of the [OIII] luminosity. This is very similar to the scaling found for the broad-line region (BLR) which is explained in terms of a constant photoionization parameter. This relation seems to connect the NLR of radio-quiet quasars and Seyferts. |
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