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Journal article
Shedding New Light on Weak Emission-line Quasars in the C iv–Hβ Parameter Space
The Astrophysical journal, v 950(2), pp 97-108
20 Jun 2023
Abstract
Weak emission-line quasars (WLQs) are a subset of type 1 quasars that exhibit extremely weak Lyα + N vλ1240 and/or C ivλ1549 emission lines. We investigate the relationship between emission-line properties and accretion rate for a sample of 230 “ordinary” type 1 quasars and 18 WLQs at z < 0.5 and 1.5 < z < 3.5 that have rest-frame ultraviolet and optical spectral measurements. We apply a correction to the Hβ-based black hole mass (MBH) estimates of these quasars using the strength of the optical Fe ii emission. We confirm previous findings that WLQs’ MBH values are overestimated by up to an order of magnitude using the traditional broad-emission-line region size–luminosity relation. With this MBH correction, we find a significant correlation between Hβ-based Eddington luminosity ratios and a combination of the rest-frame C iv equivalent width and C iv blueshift with respect to the systemic redshift. This correlation holds for both ordinary quasars and WLQs, which suggests that the two-dimensional C iv parameter space can serve as an indicator of accretion rate in all type 1 quasars across a wide range of spectral properties.
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Details
- Title
- Shedding New Light on Weak Emission-line Quasars in the C iv–Hβ Parameter Space
- Creators
- Trung Ha - University of North TexasDix Cooper - The University of Texas at AustinBrandon Matthews - University of North TexasOhad Shemmer - University of North TexasMichael Brotherton - University of WyomingAdam Myers - University of WyomingGordon Richards - Drexel UniversityJaya Maithil - Center for Astrophysics Harvard & SmithsonianScott Anderson - University of WashingtonW Brandt - Pennsylvania State UniversityAleksandar Diamond-Stanic - Bates CollegeXiaohui Fan - University of ArizonaS Gallagher - Western UniversityRichard Green - University of ArizonaPaulina Lira - University of ChileBin Luo - Nanjing UniversityHagai Netzer - Tel Aviv UniversityRichard Plotkin - University of Nevada RenoJessie Runnoe - Vanderbilt UniversityDonald Schneider - Pennsylvania State UniversityMichael Strauss - Princeton UniversityBenny Trakhtenbrot - Tel Aviv UniversityJianfeng Wu - Xiamen University
- Publication Details
- The Astrophysical journal, v 950(2), pp 97-108
- Publisher
- IOP Publishing
- Number of pages
- 12
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:001005605200001
- Scopus ID
- 2-s2.0-85163802915
- Other Identifier
- 991020617327204721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics