Compactness of Weak Radio Sources at High Frequencies
Abstract
We have obtained 8.4 GHz VLBA observations of a 31-GHz complete sample of ~100 sources between 10 and 100 mJy. The main goals of these observations are: to determine the angular size, radio spectra and identification for a weak sample of high frequency sources; to find the fraction of sources which have sufficiently compact emission for use as calibrators for VLBI observations; and for design considerations of the proposed DSN Array. We find that a large fraction of observed sources have VLBI detections. A majority of these sources have most of their emission in a compact <1 mas radio core, with remaining sources having steep radio spectra. The source list was provided from GBT observations to remove discrete sources in the CBI fields.
Cite
@article{arxiv.0806.3061,
title = {Compactness of Weak Radio Sources at High Frequencies},
author = {W. A. Majid and E. B. Fomalont and D. S. Bagri},
journal= {arXiv preprint arXiv:0806.3061},
year = {2008}
}
Comments
To be published in the proceedings of: "Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technology". Eds. Y. Hagiwara, E. Fomalont, M. Tsuboi, and Y. Murata