Spectroscopy of Quasar Candidates from Searches of U.K.SCHMIDT Telescope Objective Prism Plates

Details Spectroscopy of Quasar Candidates from Searches of U.K.SCHMIDT Telescope Objective Prism Plates Spectroscopy of Quasar Candidates from Searches of U.K.SCHMIDT Telescope Objective Prism Plates

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.213..485s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 213, NO.2/MAR15, P. 485, 1985

Astronomy and Astrophysics

Astronomy

21

Scientific paper

In the course of a number of observing campaigns over several years, slit spectra have been obtained for an inhomogeneous set of 126 quasar candidates from searches of five UKST low-dispersion prism plates. One- hundred and eight of the candidates are confirmed as quasars, and 45 previously unpublished redshifts are presented here. Nine objects were found to be galactic stars and a further nine objects have continuous spectra or inconclusive data. Ninety-nine of the objects with slit spectroscopy, which were described from the prism searches as `probable' quasars, are confirmed as quasars, while 72 per cent of the more dubious candidates have been subsequently confirmed as quasars. Prism redshifts are too poorly determined to be used in 3D clustering analyses, and slit spectroscopy is required to give the accuracy needed for such analyses. Forty-four known quasars in the fields were not found in the UKST searches, and these are mostly brighter quasars with low redshifts. These searches apparently discriminate against such quasars, although any single technique used to search for quasars is at best only about 50 per cent complete.

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