The evolution of quasars selected by slitless technique

Details The evolution of quasars selected by slitless technique The evolution of quasars selected by slitless technique

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.126..301d&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 126, no. 2, Oct. 1986, p. 301-312.

Astronomy and Astrophysics

Astrophysics

2

Data Processing, Emission Spectra, Line Spectra, Quasars, Stellar Evolution, Red Shift, Slits, Stellar Magnitude

Scientific paper

Using the method of Zhou et al. (1983, 1985) selection effects (due to the existence of the limit apparent magnitude and the identification of emission lines) in the study of the evolution of quasars discovered by the slitless technique are examined. Quasars with the same limit apparent magnitude and whose absolute magnitudes are within a specified range are used. From the calculated and observed redshift distributions, an evolutionary law of quasar density is proposed which is consistent with previous results. It is suggested that the curve of cumulative number density of quasars vs absolute magnitude becomes flat when the absolute magnitude is larger than 28.5 mg, in agreement with results obtained form previous observations.

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