A study of ten quasars with redshifts greater than four

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

Research output: Contribution to journalArticlepeer-review


Four quasars with redshifts greater than four were detected in a low-resolution CCD grism survey. CCD photometry and high S/N, moderate resolution spectra are presented for these quasars and the six other known quasars with redshifts above 4. The MB values of nine of the objects are between -27.5 and -25, with the tenth quasar having an MB value of -29. The emission lines and shapes of the continua of these ten quasars are similar to those of lower-redshift quasars. The results suggest that the C IV emission lines in high-redshift quasars may be weaker than those in lower-redshift quasars. The continua of all of the high-redshift quasars display strong depressions blueward of the Ly-alpha emission line.
Original languageEnglish (US)
Pages (from-to)1507-1522
JournalAstronomical Journal
StatePublished - Nov 1 1989
Externally publishedYes


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