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Sub-milliarcsecond Imaging of Quasars and AGN by Kellermann, K. I.; Vermeulen, R. C.; Zensus, J. A.; Cohen, M. H. is a scholarly article available to read on EtoBox.

What is Sub-milliarcsecond Imaging of Quasars and AGN about?

We have used the VLBA at 15 GHz to image the structure of 132 strong compact AGN and quasars with a resolution better than one milliarcsecond and a dynamic range typically exceeding 1000 to 1. These observations were made as part of a program to investigate the sub-parsec structure of quasars and AGN and to study the changes in their structure with time. Many of the sources included in our study, particularly those located south of +35 degrees, have not been previously imaged with milliarcsecond resolution. Each of the sources has been observed at multiple epochs. In this paper we show images of each of the 132 sources which we have observed. For each source we present data at the epoch which had the best quality data. The milliarcsecond jets generally appear one-sided but two-sided structure is often found in lower luminosity radio galaxies and in high luminosity quasars with gigahertz peaked spectra. Usually the structure is unresolved along the direction perpendicular to the jet, but a few sources have broad plumes. In some low luminosity radio galaxies, the structure appears more symmetric at 2 cm than at long wavelengths. The apparent long wavelength symmetry in these sources

Author

Kellermann, K. I.; Vermeulen, R. C.; Zensus, J. A.; Cohen, M. H.

Published

1998

Language

EN