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Published August 2002 | Published + Submitted
Journal Article Open

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


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 10^(10)–10(12) 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.

Additional Information

© 2002. The American Astronomical Society. Received 2002 February 22; accepted 2002 April 30. J. A. Z. was supported for this research through a Max-Planck Research Award. This research has made use of data from the University of Michigan Radio Astronomy Observatory (supported by funds from the University of Michigan); the USNO Radio Reference Frame Image Database (RRFID); the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration; and the SIMBAD database, operated at CDS, Strasbourg, France. H. M. Aller, M. C. Aller, J. Armstrong, D. C. Homan, M. L. Lister, A. P. Lobanov, M. Russo, and R. West provided valuable help and important suggestions. R. W. Goodrich and G. B. Taylor collaborated in the optical observations reported in the Appendix.

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August 19, 2023
February 10, 2024