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Published July 2005 | Published + Submitted
Journal Article Open

VLBA Imaging Polarimetry of Active Galactic Nuclei: An Automated Approach


We present full polarization Very Long Baseline Array (VLBA) observations at 5 and 15 GHz of 24 compact active galactic nuclei (AGNs). These sources were observed as part of a pilot project to demonstrate the feasibility of conducting a large VLBI survey to further our understanding of the physical properties and temporal evolution of AGN jets. The sample is drawn from the Cosmic Lens All-Sky Survey (CLASS) where it overlaps with the Sloan Digital Sky Survey at declinations north of 15°. There are 2100 CLASS sources brighter than 50 mJy at 8.4 GHz, of which we have chosen 24 for this pilot study. All 24 sources were detected and imaged at 5 GHz with a typical dynamic range of 500 : 1, and 21 of 24 sources were detected and imaged at 15 GHz. Linear polarization was detected in eight sources at both 5 and 15 GHz, allowing for the creation of Faraday rotation measure (RM) images. The core RMs for the sample were found to have an average absolute value of 390 ± 100 rad m^(-2). We also present the discovery of a new compact symmetric object, J08553+5751. All data were processed automatically using pipelines created or adapted for the survey.

Additional Information

© 2005. The American Astronomical Society. Received 2005 January 17; accepted 2005 March 9. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, Caltech, under contract with NASA.

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