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Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. II. Additional Sources

J. A. Zensus et al 2002 The Astronomical Journal 124 662-674   doi: 10.1086/341585  Help

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J. A. Zensus1,2, E. Ros2, K. I. Kellermann1, M. H. Cohen3, R. C. Vermeulen4 and M. Kadler2
1 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903
2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
3 Department of Astronomy, MS 105-24, California Institute of Technology, Pasadena, CA 91125
4 Netherlands Foundation for Research in Astronomy, Postbus 2, NL-7990 AA Dwingeloo, Netherlands
E-mail: azensus@mpifr-bonn.mpg.de, ros@mpifr-bonn.mpg.de, kkellerm@nrao.edu, mhc@astro.caltech.edu, rvermeulen@nfra.nl and mkadler@mpifr-bonn.mpg.de

ABSTRACT. We report further results from our imaging survey at 15 GHz (λ = 2 cm) with the Very Long Baseline Array (VLBA). This paper presents single-epoch images for 39 sources, bringing the total number of objects in the sample to 171. Our sample is representative of a complete unbiased sample, and it will be used for statistical analysis of source properties. We compare the observed brightness temperatures derived from our VLBA observations with those derived from total intensity variations at 22 and 37 GHz. These are consistent with intrinsic brightness temperatures in the range 1010–1012 K. We also present three new spectroscopic redshift values: z = 0.517 ± 0.001 for 0026+346, z = 1.591 ± 0.003 for 0727-115, and z = 0.2016 ± 0.0004 for 1155+251.

Key words: galaxies: active; galaxies: jets; galaxies: nuclei

Print publication: Issue 2 (2002 August)
Received 2002 February 22, accepted for publication 2002 April 30

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