We present observations of RX J105225.9 + 571905, a z = 4.45 quasar discovered during a very deep ROSAT survey of the Lockman Hole. In addition to being the most distant known X-ray-selected quasar, RX J105225.9 + 571905 is among the least optically luminous quasars found to date at redshifts above 4.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science