Nine optically selected quasars with redshifts larger than 3

Details Nine optically selected quasars with redshifts larger than 3 Nine optically selected quasars with redshifts larger than 3

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316l...1s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 316, May 1, 1987, p. L1-L3. Research supported by t

Other

35

Astronomical Spectroscopy, Cosmology, Lyman Alpha Radiation, Quasars, Red Shift, Charge Coupled Devices, Emission Spectra, Line Spectra

Scientific paper

The authors report the detection of nine quasars with redshifts between 3.0 and 3.8. The quasars were all found in a grism survey from their Lyman-α emission line. The r magnitudes of the quasars range from 18.5 to 21.7. The strengths of the Lyman-α lines are comparable to the values observed in other quasars (rest equivalent widths from 40 to 160 Å). The spectrum of one of the objects possesses complex broad absorption features, similar to those seen in PHL 5200. A preliminary evaluation of these findings suggests that the comoving quasar density declines gradually beyond z = 3.

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