EDP Sciences
Free access
Volume 401, Number 1, April I 2003
Page(s) 161 - 172
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20030118

A&A 401, 161-172 (2003)
DOI: 10.1051/0004-6361:20030118

Intraday variability in compact extragalactic radio sources

II. Observations with the Effelsberg 100 m radio telescope
A. Kraus1, T. P. Krichbaum1, R. Wegner1, A. Witzel1, G. Cimò1, A. Quirrenbach2, S. Britzen1, L. Fuhrmann1, A. P. Lobanov1, C. E. Naundorf1, K. Otterbein1, B. Peng1, 3, M. Risse1, E. Ros1 and J. A. Zensus1

1  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2  University of California San Diego, Dept. of Physics, Center for Astrophysics and Space Sciences, Mail Code 0424, La Jolla, CA 92093-0424, USA
3  National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, PR China

(Received 20 September 2002 / Accepted 15 January 2003 )

We present the data from 11 observing campaigns (carried out between 1989 and 1999) at the Effelsberg 100 m radio telescope to study Intraday Variability in Active Galactic Nuclei. Most of these observations were performed in total power and linear polarization. We give summary tables, light curves, and structure functions from these data sets. Due to the large number of individual observations, only examples of the lightcurves will be presented here; the complete set of figures will be accessible online. Intraday variations are present in nearly all sources (detected during at least one of the observing campaigns). Variations in total flux density are usually accompanied by similar variability of the linear polarization. In most cases, the latter variations are stronger and faster by up to a factor of two.

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

Offprint request: A. Kraus, akraus@mpifr-bonn.mpg.de

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© ESO 2003