Very faint quasar survey - Procedures and preliminary results

Details Very faint quasar survey - Procedures and preliminary results Very faint quasar survey - Procedures and preliminary results

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..869s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 869-874.

Astronomy and Astrophysics

Astronomy

6

Faint Objects, Quasars, Red Shift, Signal To Noise Ratios, Sky Surveys (Astronomy), Emission Spectra, Line Spectra, Stellar Spectra

Scientific paper

A survey for faint emission line objects has been carried out at Canada-France Hawaii Telescope using multiaperture spectroscopy. The limiting magnitude is 23.1 and the survey covers an area of 0.68 sq deg. Above an emission line signal-to-noise threshold of 6, ten very faint emission line galaxies were detected as well as five quasar candidates. The faintest quasar candidates were detected by the presence of a single strong emission line and are likely to be at about 3 although follow-up spectroscopy is required to confirm the redshifts. The survey (which is most sensitive over the redshift range of 2.4 to 4.7) is well calibrated and uses emission line search procedures designed to yield reliable space densities from the sample of objects obtained.

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