Survey incompleteness and the evolution of the QSO luminosity function

Details Survey incompleteness and the evolution of the QSO luminosity function Survey incompleteness and the evolution of the QSO luminosity function

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf....7m&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 7-8 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

4

Astronomical Spectroscopy, Emission Spectra, Line Spectra, Quasars, Stellar Color, Stellar Luminosity, Stellar Spectra, Estimating, Photosphere, Variability

Scientific paper

We concentrate on a type of QSO survey which depends on selecting QSO candidates based on combinations of colors. Since QSO's have emission lines and power-law continua, they are expected to yield broadband colors unlike those of stellar photospheres. Previously, the fraction of QSO's expected to be hiding (unselected) within the locus of stellar (U-J, J-F) colors was estimated at about 15 percent. We have now verified that the KK88 survey is at least 11 percent incomplete, but have determined that it may be as much as 34 percent incomplete. The 'missing' QSO's are expected to be predominantly at z less than or = 2.2. We have studied the proper motion and variability properties of all stellar objects with J less than or = 22.5 or F less than or = 21.5 in the SA 57 field which has previously been surveyed with a multicolor QSO search by KK88.

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