Wide-field VLBI imaging without supercomputers
O. Wucknitz [1]
- Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
Abstract
VLBI offers the highest resolution of all observing techniques. At the same
time, the field of view is intrinsically only limited by the primary beam of
individual telescopes and thus not necessarily smaller than that of connected
interferometers. Doing the exercise in practice, however, is still a major
challenge. Correlations have to be done with high spectral and temporal
resolution, which produces considerable data volumes. Mapping these large data
sets for very many facets in the standard way becomes so prohibitively
expensive that more efficient ways have to be found. In this contribution I
discuss such an approach that increases the efficiency by orders of
magnitude. This method has already been used to produce full primary-beam maps
in a test case and is currently being tested and improved further. Very
efficient imaging methods are not only required for current VLBI
instrumentation but will also be essential to make long-baseline SKA imaging
possible with realistic efforts.
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Script last modified on 7 Sep 2010
Last change to this data base entry on 13 Jul 2009