The Hamburg Quasar Survey. I. Schmidt observations and plate digitization.

Details The Hamburg Quasar Survey. I. Schmidt observations and plate digitization. The Hamburg Quasar Survey. I. Schmidt observations and plate digitization.

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..111..195h&link_type=abstract

Astronomy and Astrophysics Supplement, v.111, p.195

Astronomy and Astrophysics

Astrophysics

186

Methods: Data Analysis, Techniques: Spectroscopic, Surveys, Quasars: General Closenv

Scientific paper

The Hamburg Quasar Survey is a wide-angle objective prism survey for finding bright QSOs in the northern sky. It currently intends to provide a complete sample of bright, high-redshift QSOs in an area of ~14000deg^2^, and to provide the base for an efficient identification of ROSAT AGNs. In this paper we describe observational techniques used in obtaining the Schmidt plate exposures and a fast digitization technique, developed to make surveys for finding AGNs in large areas of the sky. Digitization of a 24x24cm^2^ direct plate is achieved in 9 hours, while objective prism plates are scanned in less than three hours with decreased resolution.. Until the end of 1993 1199 Schmidt plates in 451 fields (~11000deg^2^) had been taken and their digitization is now completed. Tests of the performance of the digitization technique show that reliable detection of the spectra is obtained to density levels 0.25-0.4 above background. This is sufficient for searches of complete samples of objects with 13<~B<~17.5 on digitized objective prism plates.

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