Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110...78k&link_type=abstract
Astronomical Journal v.110, p.78
Astronomy and Astrophysics
Astronomy
31
Galaxies: Distances And Redshifts, Quasars: General
Scientific paper
We are conducting a survey to identity z > 4 quasars using a digital version of the Second Palomar Sky Survey. The plates are taken in the photographic JFN bands and calibrated to the Gunn-Thuan gri system, making these data suitable for a multicolor search for quasars in the redshift range of 4.0 <~ z <~ 4.8. A new software package, SKICAT, was developed to perform automatic reduction of these scans into object catalogs, to classify the objects as stars or galaxies to faint levels objectively using a machine learning decision tree method, and to allow for easy manipulation of the final catalogs. Here we report on the initial results from this survey. We have selected high-redshift quasar candidates from 14 fields with a total area covered of ~560 deg^2^ over the magnitude range 16.5 <= m_r_ <= 19.6. Follow-up work is now well underway, and is complete for several fields. Here we present a preliminary description of the survey as well a spectroscopy, coordinates, and finding charts for our first five z > 4 quasars.
de Carvalho Reinaldo R.
Dickson Eric S.
Djorgovski Stanislav G.
Fayyad U.
Kennefick Daniel J.
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