Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..430l&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Astronomy and Astrophysics
Astronomy
Scientific paper
The focus of this presentation will be the problems associated with obtaining high quality images from a high orbiting space VLBI (SVLBI) mission. SVLBI intensifies and magnifies all imaging problems, making these problems clearer to understand, though much harder to solve. It is necessary to notice that as an astronomical instrument SVLBI possesses one explicit advantage: it is an extremely high angular resolution. Currently it could be up to microarcseconds and unlimited potentially in prospect. At the same time we have to "pay" for this advantage by a few disadvantages making high orbiting SVLBI mission hard to implement. These disadvantages are the following: phase instability, poor (u,v)-coverage, low sensitivity. Possible ways of the solution the problems above were considered. These ways could be the following: usage of Multi-Frequency Synthesis (MFS) enable us to improve poor (u,v)-coverage, dynamic range, and phase instability; usage of sensitive radio telescopes or compact arrays as ground support of the SVLBI mission enable us to improve a sensitivity of the SVLBI mission; usage of two or more space-borne radio telescopes enable us to improve poor (u,v)-coverage and sensitivity; developing a modern imaging technology.
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