Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phys...17..357o&link_type=abstract
(Niels Bohr Institut, Teknisk Videnskabelige Forskningsrad, and Nordisk Institut for Teoretisk Atomfysik, Symposium on Quasars a
Astronomy and Astrophysics
Astronomy
7
Astronomical Spectroscopy, Extragalactic Radio Sources, Quasars, Red Shift, Ultraviolet Astronomy, Emission Spectra, Line Spectra, Lyman Alpha Radiation, Southern Hemisphere
Scientific paper
Lyman-alpha emission in large redshift quasars is readily detectable on slitless spectrograms taken with an objective prism on the Curtis Schmidt and with a transmission grating-prism combination on the 4-m telescope. This provides a new survey method, independent of color, for finding radio-quiet quasars in large numbers. Surveys by Schmidt and Hoag and Smith with the 4-m telescope have produced more than 200 candidates with z greater than 1.5 and less than 3.5 and m greater than 16 and less than 21. Spectroscopic observations with the CTIO SIT vidicon system have been carried out for more than 50 of the candidates, with the result that the basic properties of the surveys are known. To date, three 16th-magnitude quasars with z of about 2.2 and six quasars with z greater than 3.0 and less than 3.25 have been found. A preliminary analysis of the data indicates that the space density of quasars is at least constant, if not increasing, over the interval z greater than 1.9 and less than 3.25.
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