| Issue |
A&A
Volume 409, Number 2, October II 2003
|
|
|---|---|---|
| Page(s) | 787 - 792 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20031180 | |
| Published online | 17 November 2003 | |
Confusion in interferometer observations
Pushchino Radio Astronomy Observatory of the Lebedev Physical Institute of RAS, Pushchino, Moscow region, 142290, Russia and Isaac Newton Institute, Chile, Pushchino Branch, Russia
Corresponding author: art@prao.psn.ru
Received:
1
April
2003
Accepted:
3
June
2003
The confusion probability distribution in interferometer
observations is derived. It is shown that the form of the
distribution depends on the correlation between fringe
visibilities V and flux densities S of radio sources. Because the
correlation depends on the universe model, the evolution of
radio source dimensions, and the evolution of the radio luminosity
function, the statistical VLBI observations give a new
cosmological test to analyse different universe
models and evolution models.
An expression for the variance of the confusion distribution is
obtained. It is shown that the confusion variance in VLBI observations
is much less than that in observations with a single radio
telescope.
Key words: techniques: interferometric / radio continuum: general
© ESO, 2003
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