The Physical Constraints on a New LoBAL QSO at z = 4.82

Weimin Yi, Richard Green, Jin Ming Bai, Tinggui Wang, Catherine J. Grier, Jonathan R. Trump, William N. Brandt, Wenwen Zuo, Jinyi Yang, Feige Wang, Chenwei Yang, Xue Bing Wu, Hongyan Zhou, Xiaohui Fan, Linhua Jiang, Qian Yang, Watson Varricatt, Tom Kerr, Peter Milne, Sam BenigniJian Guo Wang, Jujia Zhang, Fang Wang, Chuan Jun Wang, Yu Xin Xin, Yu Feng Fan, Liang Chang, Xiliang Zhang, Bao Li Lun

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Very few low-ionization broad absorption line (LoBAL) QSOs have been found at high redshifts, to date. One high-redshift LoBAL QSO, J0122+1216, was recently discovered by the Lijiang 2.4 m Telescope, with an initial redshift determination of 4.76. Aiming to investigate its physical properties, we carried out follow-up observations in the optical and near-IR spectroscopy. Near-IR spectra from UKIRT and P200 confirm that it is a LoBAL, with a new redshift determination of 4.82 0.01 based on the Mg ii emission-line. The new Mg ii redshift determination reveals strong blueshifts and asymmetry of the high-ionization emission lines. We estimate a black hole mass of ∼2.3 109 M o and Eddington ratio of ∼1.0 according to the empirical Mg ii-based single-epoch relation and bolometric correction factor. It is possible that strong outflows are the result of an extreme quasar environment driven by the high Eddington ratio. A lower limit on the outflowing kinetic power (>0.9% L Edd) is derived from both emission and absorption lines, indicating that these outflows play a significant role in the feedback process that regulates the growth of its black hole, as well as host galaxy evolution.

Original languageEnglish (US)
Article number135
JournalAstrophysical Journal
Issue number2
StatePublished - Apr 1 2017


  • galaxies: high-redshift
  • quasars: absorption lines
  • quasars: general
  • quasars: individual

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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