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20 April 2024 |
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Size and Structure of the Narrow-Line Region of Quasars | | Nicola Bennert
; Heino Falcke
; Hartmut Schulz
; Andrew S. Wilson
; Beverley J. Wills
; | | Date: |
19 Jun 2002 | | Journal: | Astrophys.J. 574 (2002) L105-L110 | | Subject: | astro-ph | | Affiliation: | Univ. Bochum), Heino Falcke (MPIfR Bonn), Hartmut Schulz (Univ. Bochum), Andrew S. Wilson (Univ. Maryland), Beverley J. Wills (Univ. Texas | | Abstract: | We have observed the narrow-line regions (NLRs) of the seven brightest radio-quiet PG (or BQS) quasars (z < 0.5) with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope (HST). Linear-ramp filters were used to image the [OIII] lambda 5007 line emission with 0.0455-0.1 arcsec pixel resolution. We find that the NLRs are very compact with typical extents of 2-4 arcsec. Two quasars show compact filamentary structures similar to Seyfert NLRs. They may be related to radio outflows. Most interestingly, when including a sample of Seyfert galaxies observed with HST, we tentatively find that the size of the NLR is proportional to the square root of the [OIII] luminosity. This is comparable to the scaling found for the size of the broad-line region with continuum luminosity, which has been interpreted in terms of a constant photoionization parameter. The relation determined here connects the NLR of radio-quiet quasars and Seyferts over three orders of magnitude in [OIII] luminosity. | | Source: | arXiv, astro-ph/0206334 | | Services: | Forum | Review | PDF | Favorites | |
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