Luminous high-redshift quasars can be used to probe of the intergalactic medium ( IGM ) 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 \pm 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 M _ { \text { 1450 } } = -25.96 \pm 0.08 .
PSO J006.1240+39.2219 has a strong Ly \alpha emission compared with typical low-redshift quasars , but the measured near-zone region size is R _ { \text { NZ } } = 3.2 \pm 1.1 proper megaparsecs , which is consistent with other quasars at z \sim 6 .