SDSS J013127.34-032100.1: A newly discovered radio-loud quasar at z = 5.18 with extremely high luminosity

Wei Min Yi, Feige Wang, Xue Bing Wu, Jinyi Yang, Jin Ming Bai, Xiaohui Fan, William N. Brandt, Luis C. Ho, Wenwen Zuo, Minjin Kim, Ran Wang, Qian Yang, Ju Jia Zhang, Fang Wang, Jian Guo Wang, Yanli Ai, Yu Feng Fan, Liang Chang, Chuan Jun Wang, Bao Li LunYu Xin Xin

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30 Scopus citations


Very few of the z > 5 quasars discovered to date have been radio-loud, with radio-to-optical flux ratios (radio-loudness parameters) higher than 10. Here we report the discovery of an optically luminous radio-loud quasar, SDSS J013127.34-032100.1 (J0131-0321 in short), at z = 5.18 ± 0.01 using the Lijiang 2.4 m and Magellan telescopes. J0131-0321 has a spectral energy distribution consistent with that of radio-loud quasars. With an i-band magnitude of 18.47 and a radio flux density of 33 mJy, its radio-loudness parameter is ∼100. The optical and near-infrared spectra taken by Magellan enable us to estimate its bolometric luminosity to be L bol ∼ 1.1 × 1048 erg s-1, approximately 4.5 times greater than that of the most distant quasar known to date. The black hole mass of J0131-0321 is estimated to be 2.7 × 109 M , with an uncertainty up to 0.4 dex. Detailed physical properties of this high-redshift, radio-loud, potentially super-Eddington quasar can be probed in the future with more dedicated and intensive follow-up observations using multi-wavelength facilities.

Original languageEnglish (US)
Article numberL29
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Nov 10 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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