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. Peng^2,3 - M. Risse² - T.P. Krichbaum² - R. Wegner² - C.E. Naundorf²

Send offprint request: A. Kraus,
e-mail: akraus@mpifr-bonn.mpg.de

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

Abstract:

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