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Journal article
Kinematics of C-IV and [O III] emission in luminous high-redshift quasars
Monthly notices of the Royal Astronomical Society, v 486(4), pp 5335-5348
01 Jul 2019
Abstract
We characterize ionized gas outflows using a large sample of similar or equal to 330 high-luminosity [45.5 < log(L-bol/erg s(-1)) < 49.0], high-redshift (1.5 less than or similar to z less than or similar to 4.0) quasars via their [O III]lambda lambda 4960,5008 emission. The median velocity width of the [O III] emission line is 1540 kms(-1), increasing with increasing quasar luminosity. Broad, blue-shifted wings are seen in the [O III] profiles of ?42 per?cent of the sample. Rest-frame ultraviolet spectra with well-characterized C?iv?1550 emission-line properties are available for more than 210 quasars, allowing an investigation of the relationship between the broad-line region (BLR) and narrow-line region (NLR) emission properties. The [O?iii] blueshift is correlated with Civ blueshift, even when the dependence of both quantities on quasar luminosity has been taken into account. A strong anticorrelation between the [O III] equivalent width (EW) and Civ blueshift also exists. Furthermore, [O III] is very weak, with EW < 1 angstrom in ?10 per?cent of the sample, a factor of 10 higher compared to quasars at lower luminosities and redshifts. If the [O III] emission originates in an extended NLR, the observations suggest that quasar-driven winds are capable of influencing the host-galaxy environment out to kilo-parsec scales. The mean kinetic power of the ionized gas outflows is then 1044.7 erg s(-1), which is 0.15 percent of the bolometric luminosity of the quasar. These outflow efficiencies are broadly consistent with those invoked in current active galactic nuclei feedback models.
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Details
- Title
- Kinematics of C-IV and [O III] emission in luminous high-redshift quasars
- Creators
- Liam Coatman - University of CambridgePaul C. Hewett - University of CambridgeManda Banerji - University of CambridgeGordon T. Richards - Drexel UniversityJoseph F. Hennawi - University of California, Santa BarbaraJ. Xavier Prochaska - Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 486(4), pp 5335-5348
- Publisher
- Oxford Univ Press
- Number of pages
- 14
- Grant note
- STFC via an Ernest Rutherford Fellowship; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) Royal Society via a University Research Fellowship Science and Technology Facilities Council (STFC); UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); Science and Technology Development Fund (STDF) STFC via a Consolidated Grant
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000474908200064
- Scopus ID
- 2-s2.0-85067965081
- Other Identifier
- 991019169596504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics