Starting in 1991 we have performed a regular monitoring of EGRET sources with the Effelsberg 100-m telescope and the IRAM 30-m at Pico Veleta. In comparison with data on a sample of flat-spectrum quasars which have not been seen by EGRET we search for correlations of any kind in the behaviour of FSRQ's in the radio and gamma-ray regime. While there is no radio-to-gamma-ray luminosity correlation for these sources, it seems that gamma-ray high states coincide with increased activity in the radio regime with a strong tendency that gamma-ray outbursts precede radio outbursts. The gamma-ray spectra seem to harden with increasing flux level.
@article{arxiv.astro-ph/9603123,
title = {Radio observations of gamma-ray blazars},
author = {M. Pohl and A. Muecke and W. Reich and P. Reich and R. Schlickeiser and H. Ungerechts},
journal= {arXiv preprint arXiv:astro-ph/9603123},
year = {2007}
}
Comments
6 pages, Proceedings of the "Blazar Variability Workshop", Miami, February 1996