A quasar discovered at redshift 6.6 from Pan-STARRS1

Ji Jia Tang, Tomotsugu Goto, Youichi Ohyama, Wen Ping Chen, Fabian Walter, Bram Venemans, Kenneth C. Chambers, Eduardo Bañados, Roberto Decarli, Xiaohui Fan, Emanuele Farina, Chiara Mazzucchelli, Nick Kaiser, Eugene A. Magnier

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Luminous high-redshift quasars can be used to probe of the intergalactic medium in the early universe because their UV light is absorbed by the neutral hydrogen along the line of sight. They help us to measure the neutral hydrogen fraction of the high-z universe, shedding light on the end of reionization epoch. In this paper, we present a discovery of a new quasar (PSO J006.1240+39.2219) at redshift z = 6.61 ± 0.02 from Panoramic Survey Telescope & Rapid Response System 1. Including this quasar, there are nine quasars above z > 6.5 up to date. The estimated continuum brightness is M1450 = −25.96 ± 0.08. PSO J006.1240+39.2219 has a strong Ly α emission compared with typical low-redshift quasars, but the measured near-zone region size is RNZ = 3.2 ± 1.1 proper megaparsecs, which is consistent with other quasars at z ∼ 6.

Original languageEnglish (US)
Pages (from-to)4568-4572
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - May 1 2017


  • Dark ages
  • First stars
  • Quasars: general
  • Quasars: individual
  • Reionization

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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