First observation of a quasar with a redshift of 4

Details First observation of a quasar with a redshift of 4 First observation of a quasar with a redshift of 4

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..131w&link_type=abstract

Nature (ISSN 0028-0836), vol. 325, Jan. 8, 1987, p. 131-133. Research supported by Cambridge University and SERC.

Other

58

Emission Spectra, Faint Objects, Luminosity, Quasars, Red Shift, Cosmology, Lyman Alpha Radiation, Lyman Beta Radiation, Magnitude

Scientific paper

Results are presented from a survey, using the U.K Schmidt Telescope, of more than 30 sq deg of sky to measure the form and normalization of the luminosity function of high-redshift quasars at a limiting red magnitude of about 20.5. Exposures in the U, J, V, R and I optical passbands revealed the existences of the quasar 0046-293, with a redshift of 4.01, and 0044-276, with a redshift of 3.42. The 4.01 redshift quasar was in a field containing other high-redshift quasars. Observations of the new quasars demonstrate that optically-detected quasars with absolute magnitudes of -27 exist, and that the luminosity function of high-redshift quasars extends over at least two magnitudes. Determination of the spatial density of radio-loud high-redshift quasars would provide constraints on the epoch of formation of large-scale structure in the Universe.

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