Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.314..238h&link_type=abstract
Nature (ISSN 0028-0836), vol. 314, March 21, 1985, p. 238-240.
Astronomy and Astrophysics
Astronomy
33
Astronomical Spectroscopy, Quasars, Red Shift, Density Distribution, Emission Spectra, Photographic Plates, Schmidt Telescopes
Scientific paper
The discovery on a UK Schmidt telescope low-dispersion IIIaF objective prism plate of a QSO with z = 3.7 is reported. This QSO is now the one with the second highest redshift known and lies in the same region in which a QSO with z = 3.61 has already been reported. A QSO with z = 3.4 is also noted. Before these observations, only seven QSOs with z of 3.4 or greater were known throughout the whole sky. When compared with the results of a search for QSOs with redshift between 2.7 and 3.3 on the same plate, these observations do not support suggestions of a redshift cutoff of about 3.5 in the QSO distribution, but rather support the suggestion of a steady decline from redshift of about two. It is shown here that deep searches over small areas of sky are unlikely to be successful in discovering QSOs at redshift over four and that such searches must be carried out over very large areas.
Hazard Cyril
McMahon Richard
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