Spectral distributions in compact radio sources I. Imaging with VLBI data
Astrophysics
2009-10-30 v1
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.
Cite
@article{arxiv.astro-ph/9804112,
title = {Spectral distributions in compact radio sources I. Imaging with VLBI data},
author = {A. P. Lobanov},
journal= {arXiv preprint arXiv:astro-ph/9804112},
year = {2009}
}
Comments
13 pages, 12 figures (17 frames), LaTeX2e, A&A macros, accepted to A&AS