EDP Sciences
Free access
Volume 409, Number 2, October II 2003
Page(s) 787 - 792
Section Physical and chemical processes
DOI http://dx.doi.org/10.1051/0004-6361:20031180

A&A 409, 787-792 (2003)
DOI: 10.1051/0004-6361:20031180

Confusion in interferometer observations

V. S. Artyukh

Pushchino Radio Astronomy Observatory of the Lebedev Physical Institute of RAS, Pushchino, Moscow region, 142290, Russia and Isaac Newton Institute, Chile, Pushchino Branch, Russia
(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 V-S 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