Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-01-10
A&A 2011, 527, A107
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
11 pages, no figures, accepted by A&A
Scientific paper
10.1051/0004-6361/201116434
Paper I of the series re-derived the radio interferometry measurement equation (RIME) from first principles, and extended the Jones formalism to the full-sky case, incorporating direction-dependent effects (DDEs). This paper aims to describe both classical radio interferometric calibration (selfcal and related methods), and the recent developments in the treatment of DDEs, using the RIME-based mathematical framework developed in Paper I. It also aims to demonstrate the ease with which the various effects can be described and understood. The first section of this paper uses the RIME formalism to describe self-calibration, both with a full RIME, and with the approximate equations of older software packages, and shows how this is affected by DDEs. The second section gives an overview of real-life DDEs and proposed methods of dealing with them. This results in a formal RIME-based description and comparison of existing and proposed approaches to the problem of DDEs.
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