Discovery of an X-ray selected quasar with a redshift of 4.45

D. P. Schneider, Maarten Schmidt, G. Hasinger, I. Lehmann, J. E. Gunn, R. Giacconi, J. Trümper, G. Zamorani

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1230-1233
Number of pages4
JournalAstronomical Journal
Issue number4
StatePublished - Apr 1998

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Discovery of an X-ray selected quasar with a redshift of 4.45'. Together they form a unique fingerprint.

Cite this