A study of ten quasars with redshifts greater than four

Details A study of ten quasars with redshifts greater than four A study of ten quasars with redshifts greater than four

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1507s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Nov. 1989, p. 1507-1522. Research supported by the John D. and Catherine T. MacA

Astronomy and Astrophysics

Astronomy

122

Charge Coupled Devices, H Alpha Line, Quasars, Red Shift, Astronomical Photometry, Signal To Noise Ratios, Sky Surveys (Astronomy), Stellar Spectra

Scientific paper

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.

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