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The Cerro El Roble Sample of Faint Ultraviolet Excess Objects in the South Galactic Pole

Published online by Cambridge University Press:  12 April 2016

Luis E. Campusano  and
Carlos Torres
Luis E. Campusano
Affiliation:
Observatorio Astronómico de Cerro Calán, Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago de Chile
Carlos Torres
Affiliation:
Observatorio Astronómico de Cerro Calán, Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago de Chile

Abstract

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The idea to develop selected regions of the sky for extragalactic research in the Galactic Polar areas is emphasized. One such region, centered at α=00h 53m (1950) δ=-28°03', has been examined by several authors for surveys of QSO candidates. We have also searched 44-deg2 of this region, containing the South Galactic Pole (SGP), for relative ultraviolet excess objects (UVXs) in 5 partially overlapping fields of the 70/100 cm Maksutov telescope of Cerro El Roble. The search was found to be extremely incomplete at B>19 mag, while the completeness for B ≲ 19 was estimated to be approximately 30% in non overlapping regions and 50% in overlapping regions. Only the central overlapping region was used for the comparison of the surface densities of different UVX samples. The surface density in this region is 7.2 UVX/deg2 at B∼19 mag and approximately a factor 2 larger than the one found by Savage and Bolton (1979) in two 25 deg2 fields near the SGP. In addition, our surface density value is a factor 3/2 larger than the density found by Braccesi, Formiggini and Gandolfi (1970) near the North Galactic Pole. Twenty-seven new QSOs have been already identified in our UVX sample from spectroscopic data collected on the Las Campanas 2.5 meter telescope. A statistical test applied to the surface distribution of our UVXs in the central 25 deg2 region, gave a slight suggestion of non-uniformity.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 78: Astronomy with Schmidt-type telescopes , 1984 , pp. 433 - 438
Copyright
Copyright © Reidel 1984

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