Radio astronomy by very-long-baseline interferometry

Details Radio astronomy by very-long-baseline interferometry Radio astronomy by very-long-baseline interferometry

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sciam.246...53r&link_type=abstract

Scientific American, vol. 246, June 1982, p. 53-61.

Astronomy and Astrophysics

Astronomy

Radio Astronomy, Radio Telescopes, Very Long Base Interferometry, Active Galactic Nuclei, Active Galaxies, Astronomical Maps, Atmospheric Effects, Atomic Clocks, Elliptical Galaxies, Phase Shift, Quasars, Radio Frequency Interference, Radio Galaxies, Radio Interferometers, Radio Sources (Astronomy), Water Masers

Scientific paper

The principles and promising applications of the technique of very long baseline interferometry (VLBI), which allows radio astronomy to be conducted at resolutions down to 0.0001 arcsec, are discussed. The combination of signals received at locations up to thousands of kilometers apart to yield the image of an object from interference fringes is explained. Problems of phase measurements in the treatment of data from widely separated telescopes are considered, and methods of fringe-rate mapping and phase mapping developed to overcome these problems for objects containing isolated point components are illustrated for water maser observations. The mapping of more extended sources such as quasars and radio galaxies based on closure techniques using three or more telescopes is discussed, and examples of the application of this hybrid mapping technique to studies of the structure of active galactic nuclei, superluminal expansion and the central engines powering active galaxies and quasars are presented.

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