Statistics – Computation
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1309c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, April 1990, p. 1309-1326. Research supported by CNRS and Institut Geographique N
Statistics
Computation
40
Astrometry, Extragalactic Radio Sources, Very Long Base Interferometry, Astronomical Models, Brightness Distribution, Computational Astrophysics, Geodesy
Scientific paper
An algorithm to calculate source structure corrections for bandwidth synthesis delays and delay rates is used to refer the position of extragalacitc radio sources to a specific feature of each source's morphology. The delay and delay rate are obtained from VBLI observations. The algorithm and its theoretical basis are described, and simulations for a simple two-component source are discussed. VLBI data for the complex radio source NRAO 140 are analyzed. For this source, structure corrections are calculated with maps from three different VLBI imaging techniques: the hybrid-CLEAN algorithm, the maximum entropy method, and model fitting. The calculated structure corrections are compared with brightness distributions to the actual data. The results are used to map NRAO 140. It is found that the CLEAN map produces the most accurate structure corrections.
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