SDSS J013127.34-032100.1: A Newly Discovered Radio-loud Quasar at z = 5.18 with Extremely High Luminosity
Abstract
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.
- Publication:
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The Astrophysical Journal
- Pub Date:
- November 2014
- DOI:
- 10.1088/2041-8205/795/2/L29
- arXiv:
- arXiv:1410.2689
- Bibcode:
- 2014ApJ...795L..29Y
- Keywords:
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- galaxies: active;
- galaxies: high-redshift;
- quasars: individual: SDSS J0131-0321;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 5 pages, 3 figures, accepted to ApJL