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Journal article
BAL and non-BAL quasars: continuum, emission, and absorption properties establish a common parent sample
Monthly notices of the Royal Astronomical Society, v 492(3), pp 4553-4575
01 Mar 2020
Abstract
Using a sample of similar or equal to 144 000 quasars from the Sloan Digital Sky Survey Data Release 14, we investigate the outflow properties, evident in both absorption and emission, of high ionization broad absorption line (BAL) and non-BAL quasars with redshifts 1.6 less than or similar to z <= 3.5 and luminosities 45.3 erg s(-1) < log(10) (L-bol) < 48.2 erg s(-1). Key to the investigation is a continuum and emission-line reconstruction scheme, based on mean-field independent component analysis, that allows the kinematic properties of the C IV lambda 1550 emission line to be compared directly for both non-BAL and BAL quasars. C IV emission blueshift and equivalent width (EW) measurements are thus available for both populations. Comparisons of the emission-line and BAL trough properties reveal strolls systematic correlations between the emission and absorption properties. The dependence of quantitative outflow indicators on physical properties such as quasar luminosity and luminosity relative to Eddington luminosity is also shown to be essentially identical for the BAI, and non-BAL populations. There is an absence of BALs in quasars with the hardest spectral energy distributions (SEDs), revealed by the presence of strong He II lambda 1640 emission, large C IV lambda 1550 emission FW, and no measurable blueshift. In the remainder of the C IV emission blueshift versus space, BAL, and non-BAL quasars are present at all locations; for every BAL, quasar, it is possible to identify non-BAL quasars with the same emission-line outflow properties and SED hardness. The co-location of BAL, and non-BAL, quasars as a function of emission-line outflow and physical properties is the key result of our investigation, demonstrating that (high-ionization) BALs and non-BALs represent different views of the same underlying quasar population.
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Details
- Title
- BAL and non-BAL quasars: continuum, emission, and absorption properties establish a common parent sample
- Creators
- Amy L. Rankine - University of CambridgePaul C. Hewett - University of CambridgeManda Banerji - University of CambridgeGordon T. Richards - Drexel University
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 492(3), pp 4553-4575
- Publisher
- Oxford Univ Press
- Number of pages
- 23
- Grant note
- University of Notre Dame New York University Universidad Nacional Autonoma de Mexico Royal Society via a University Research Fellowship University of Utah Harvard-Smithsonian Center for Astrophysics; Smithsonian Institution Kavli Institute for the Physics and Mathematics of the Universe (IPMU) / University of Tokyo Lawrence Berkeley National Laboratory; United States Department of Energy (DOE) Alfred P. Sloan Fundation Science and Technology Facilities Council (STFC) studentship; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) STFC via the Institute of Astronomy, Cambridge, Consolidated Grant Ohio State University Vanderbilt University Max-Planck-Institut fur Astronomie (MPIA Heidelberg) Carnegie Institution for Science National Astronomical Observatories of China Chilean Participation Group U.S. Department of Energy Office of Science; United States Department of Energy (DOE) Brazilian Participating Group Instituto de Astrofisica de Canaries Carnegie Mellon University Center for HighPerformance Computing at the University of Utah United Kingdom Participation Group University of Washington University of Wisconsin Max-Planck-Institut fur Extraterrestrische Physik (MPE) Observatorio Nacional/MCTI University of Arizona Yale University New Mexico State University Pennsylvania State University University of Oxford Max-PlanckInstitut fur Astrophysik (MPA Garching) University of Portsmouth French Participation Group The Johns Hopkins University; Johns Hopkins University University of Colorado Boulder University of Virginia Leibniz Institut fur Astrophysik Potsdam (AIP) Shanghai Astronomical Observatory Korean Participation Group 1952031 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000518143200107
- Scopus ID
- 2-s2.0-85084595391
- Other Identifier
- 991019169577004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics