The second serendipitous discovery of a z>4 quasar

Donald P. Schneider, Maarten Schmidt, James E. Gunn

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This paper describes the chance discovery of the z=4.210 quasar PC 0027+0521. The quasar was found during a grism survey for emission line objects. The Lyman α line luminosity and the redshift of the quasar satisfy the survey selection criteria, but the grism spectrum of the quasar was heavily contaminated by the spectra of three nearby objects. The quasar was discovered only because it happened to lie in the slit of a spectroscopic observation of a nearby emission line candidate. The quasar is the faintest z>4 object yet found, and has strong, narrow emission lines.

Original languageEnglish (US)
Pages (from-to)880-883
Number of pages4
JournalAstronomical Journal
Issue number3
StatePublished - Mar 1994

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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