The extended narrow-line region of two type-I quasi-stellar objects

Abstract

We investigate the narrow-line region (NLR) of two radio-quiet QSOs, PG1012+008 and PG1307+085, using high signal-to-noise spatially resolved long-slit spectra obtained with FORS1 at the Very Large Telescope. Although the emission is dominated by the point-spread function of the nuclear source, we are able to detect extended NLR emission out to several kpc scales in both QSOs by subtracting the scaled central spectrum from outer spectra. In contrast to the nuclear spectrum, which shows a prominent blue wing and a broad line profile of the [O III] line, the extended emission reveals no clear signs of large scale outflows. Exploiting the wide wavelength range, we determine the radial change of the gas properties in the NLR, i.e., gas temperature, density, and ionization parameter, and compare them with those of Seyfert galaxies and type-II QSOs. The QSOs have higher nuclear temperature and lower electron density than Seyferts, but show no significant difference compared to type-II QSOs, while the ionization parameter decreases with radial distance, similar to the case of Seyfert galaxies. For PG1012+008, we determine the stellar velocity dispersion of the host galaxy. Combined with the black hole mass, we find that the luminous radio-quiet QSO follows the local M_BH-sigma* relation of active galactic nuclei.

7 pages, 5 figures, accepted for publication in ApJ

References in corpus (11)

• Massive molecular outflows and negative feedback in ULIRGs observed by Herschel-PACS
• The Discovery of 1000 km/s Outflows in Massive Post-starburst Galaxies at z=0.6
• Evidence for powerful AGN winds at high redshift: Dynamics of galactic outflows in radio galaxies during the "Quasar Era"
• Cosmic Evolution of Black Holes and Spheroids. I: The M_BH-sigma Relation at z=0.36
• Cosmic Evolution of Black Holes and Spheroids. III. The M-sigma relation in the last six billion years
• Size and properties of the narrow-line region in Seyfert-1 galaxies from spatially-resolved optical spectroscopy
• Size and properties of the narrow-line region in Seyfert-2 galaxies from spatially-resolved optical spectroscopy
• The radio structure of radio-quiet quasars
• Extended Emission-Line Regions: Remnants of Quasar Superwinds?
• The properties of the extended warm ionised gas around low-redshift QSOs and the lack of extended high-velocity outflows
• Calibrating stellar velocity dispersions based on spatially-resolved h-band spectra for improving the m-sigma relation

Cited by in corpus (4)

• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• Ionized Gas Kinematics along the Large-Scale Radio Jets in Type 2 AGNs
• Science Case and Requirements for the MOSAIC Concept for a Multi-Object Spectrograph for the European Extremely Large Telescope
• Low-Eddington ratio, changing-look active galactic nuclei: the case of NGC 4614