New quasar surveys at the Royal Observatory, Edinburgh

Details New quasar surveys at the Royal Observatory, Edinburgh New quasar surveys at the Royal Observatory, Edinburgh

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24...26c&link_type=abstract

IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr

Astronomy and Astrophysics

Astrophysics

2

Astronomical Photography, Quasars, Spectrophotometry, Astronomical Spectroscopy, Cosmology, Image Processing, Selection

Scientific paper

The observational techniques used for a series of quasar surveys at the Royal Observatory in Edinburgh, Scotland, are reviewed. Attention is given to a description of the Automated Quasar Detection (AQD) technique, which has replaced earlier visual objective-prism and grism techniques. AQD provides well-defined samples for the physical study of the collective properties of quasars including large-scale anisotropies, self-clustering, cross-clustering, and its evolution. A number of AQD samples from plates for the southern fields I, II, and IV are compared with objective prism plates, and the different selection criteria of the two methods are discussed.

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