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Over-resolution of compact sources in interferometric observations

Ivan Marti-Vidal (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; M. A. Perez-Torres ; A. P. Lobanov
Astronomy and Astrophysics (1432-0746). Vol. 541 (2012), p. A135.
[Artikel, refereegranskad vetenskaplig]

We review the effects of source size in interferometric observations and focus on the cases of very compact sources. If a source is extremely compact and/or weak (so it is not possible to detect signature of source structure in the visibilities) we describe a test of hypothesis that can be used to set a strong upper limit to the size of the source. We also estimate the minimum possible size of a source whose structure can still be detected by an interferometer (i.e., the maximum theoretical over-resolution power of an interferometer), which depends on the overall observing time, the compactness in the array distribution, and the sensitivity of the receivers. As a result, and depending on the observing frequency, the over-resolution power of forthcoming ultra-sensitive arrays, like the Square Kilometer Array (SKA), may allow us to study details of sources at angular scales down to a few micro-arcsec.

Nyckelord: instrumentation: interferometers, techniques: interferometric, techniques: high angular resolution

Denna post skapades 2012-10-16. Senast ändrad 2014-09-02.
CPL Pubid: 164785


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