期刊
ASTRONOMY & ASTROPHYSICS
卷 541, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201118334
关键词
instrumentation: interferometers; techniques: interferometric; techniques: high angular resolution
资金
- MEC [AYA2006-14986-C02-01]
- CICE, Junta de Andalucia [FQM-1747, TIC-126]
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 (such that it is impossible to detect signatures 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 of 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, such as the Square Kilometer Array (SKA), may allow us to study the details of sources at angular scales as small as a few mu as.
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