Quasar Properties from the Sloan Digital Sky Survey. III. The Quasars Obtained by the SDSS-IV

Journal Article · Thu Feb 09 00:00:00 EST 2023 · The Astrophysical Journal. Supplement Series

DOI:https://doi.org/10.3847/1538-4365/aca6e2· OSTI ID:2425265

Huang, Wei-Rong ^[1]; Chen, Zhe-Geng ^[2]; Chen, Zhi-Fu ^[2]; Li, Xiao-Feng ^[1]

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1. Guangzhou University (China)
2. Guangxi Minzu University, Nanning (China)

This paper provides the compilations of properties of the quasars newly obtained by the Sloan Digital Sky Survey (SDSS) during the fourth stage (SDSS-IV). The catalog is available on the journal's website. We have measured the main properties of emission lines around C $$\tiny{IV}$$ Mg $$\tiny{II}$$, Hβ, and Hα spectral regions. We estimate the quasar redshifts from our fits of narrow [O $$\tiny{III}$$], broad Mg $$\tiny{II}$$, and broad C $$\tiny{IV}$$ emission lines and find that the best redshifts included in DR16Q are robust with respect to our measurements. Based on the broad C $$\tiny{IV}$$, Mg $$\tiny{II}$$, Hβ, and/or Hα emission lines, we calculate the virial black hole mass with empirical relationships provided by previous works. Systematic biases are found among the different line-based mass estimators.

• Research Organization: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)
• Sponsoring Organization: Guangxi Natural Science Foundation; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)
• OSTI ID: 2425265
• Journal Information: The Astrophysical Journal. Supplement Series, Journal Name: The Astrophysical Journal. Supplement Series Journal Issue: 2 Vol. 264; ISSN 0067-0049
• Publisher: IOP Publishing
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astronomy & Astrophysics