On the behaviour of QSO space density beyond Z = 3.5

Details On the behaviour of QSO space density beyond Z = 3.5 On the behaviour of QSO space density beyond Z = 3.5

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113..336m&link_type=abstract

Astronomy and Astrophysics, vol. 113, no. 2, Sept. 1982, p. 336-339.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Spectroscopy, Quasars, Space Density, Astronomical Models, Density Distribution, Emission Spectra, Galactic Evolution, Line Spectra, Red Shift, Spatial Distribution

Scientific paper

It is established that the QSO space density must be assumed to be constant to z = 5-6 at least, by comparing color-selected QSO counts to the predictions of Mathez' (1976) Luminosity evolution Model (LEM). Osmer's (1982) use of a CTIO survey for emission-line QSOs in the range 3.7-4.7 to obtain evidence for a decrease of the QSO space density is reviewed, and it is shown that LEM predictions are in good agreement with color-selected QSO counts as well as with the results of Osmer's survey, but do not agree with Hoag and Smith's (1977) survey.

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