Journal Article

Characterization of long baseline calibrators at 2.3 GHz

F. Hungwe, R. Ojha, R. S. Booth, M. F. Bietenholz, A. Collioud, P. Charlot, D. Boboltz and A. L. Fey

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 4, pages 2113-2120
Published in print December 2011 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19232.x
Characterization of long baseline calibrators at 2.3 GHz

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We present a detailed multi-epoch analysis of 31 potential Southern hemisphere radio calibrators that were originally observed as part of a programme to maintain the International Celestial Reference Frame. At radio wavelengths, the primary calibrators are active galactic nuclei (AGNs), powerful radio emitters which exist at the centre of most galaxies. These are known to vary at all wavelengths at which they have been observed. By determining the amount of radio source structure and variability of these AGNs, we determine their suitability as phase calibrators for long baseline radio interferometry at 2.3 GHz. For this purpose, we have used a set of complementary metrics to classify these 31 southern sources into five categories pertaining to their suitability as very long baseline interferometry calibrators. We find that all of the sources in our sample would be good interferometric calibrators, and almost ninety per cent of them would be very good calibrators.

Keywords: techniques: high angular resolution; techniques: interferometric; galaxies: active; galaxies: jets; quasars: general; radio continuum: galaxies

Journal Article.  4312 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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