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Astron. Astrophys. Suppl. Ser. 141, 221-256

Intraday variability in compact extragalactic radio sources

I. VLA observations

A. Quirrenbach1 - A. Kraus2 - A. Witzel2 - J.A. Zensus2 - B. Peng2,3 - M. Risse2 - T.P. Krichbaum2 - R. Wegner2 - C.E. Naundorf2

Send offprint request: A. Kraus,

1 - University of California San Diego, Dept. of Physics, Center for Astrophysics and Space Sciences, Mail Code 0424, La Jolla, CA 92093-0424, U.S.A.
2 - Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
3 - Beijing Astronomical Observatory, Chinese Academy of Science, Beijing 100080, PR China

Received July 22; accepted October 26, 1999


We present the data of three observing campaigns with the VLA performed to study intraday variability in compact extragalactic radio sources. The first campaign (May 1989) lasted 5 days; total intensity as well as linear polarization data were obtained at 2, 3.6, 6, and 20cm wavelength for 9 program sources. In the second observing run (February 1990), a five-antenna subarray of the VLA was used for 25 days to monitor the sources 0716+714, 0917+624, and 0954+658, with dense sampling at the same four wavelengths. In the third run (October 1992), which lasted 22 days, 8 program sources were monitored at 3.6, 6, and 20cm wavelength, and 2 additional sources at 6cm only, again with a five-antenna subarray. We present summary tables, light curves, and structure functions from these data sets.

Key words: galaxies: active -- quasars: general -- radio continuum: galaxies

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