Spectral distributions in compact radio sources

Open Access

15 October 1998

journal article
Published by EDP Sciences in Astronomy and Astrophysics Supplement Series

Vol. 132 (2) , 261-273
https://doi.org/10.1051/aas:1998446

Abstract

We discuss a technique for mapping the synchrotron turnover frequency distribution using nearly simultaneous, multi--frequency VLBI observations. The limitations of the technique arising from limited spatial sampling and frequency coverage are investigated. The errors caused by uneven spatial sampling of typical multi--frequency VLBA datasets are estimated through numerical simulations, and are shown to be of the order of 10%, for pixels with the deconvolution SNR~7. The fitted spectral parameters are corrected for the errors due to limited frequency coverage of VLBI data. First results from mapping the turnover frequency distribution in 3C345 are presented.Comment: 13 pages, 12 figures (17 frames), LaTeX2e, A&A macros, accepted to A&A

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