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High resolution radio astronomy using very long baseline interferometry

REVIEW ARTICLE

Enno Middelberg1 and Uwe Bach2

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Very long baseline interferometry, or VLBI, is the observing technique yielding the highest-resolution images today. Whilst a traditionally large fraction of VLBI observations is concentrating on active galactic nuclei, the number of observations concerned with other astronomical objects such as stars and masers, and with astrometric applications, is significant. In the last decade, much progress has been made in all of these fields. We give a brief introduction to the technique of radio interferometry, focusing on the particularities of VLBI observations, and review recent results which would not have been possible without VLBI observations.


PACS

95.75.Kk Interferometry

95.55.Jz Radio telescopes and instrumentation; heterodyne receivers

98.54.Cm Active and peculiar galaxies and related systems (including BL Lacertae objects, blazars, Seyfert galaxies, Markarian galaxies, and active galactic nuclei)

98.54.Gr Radio galaxies

95.45.+i Observatories and site testing

95.55.Br Astrometric and interferometric instruments

Subjects

Instrumentation and measurement

Astrophysics and astroparticles

Dates

Issue 6 (June 2008)

Received 3 December 2007, in final form 11 March 2008

Published 2 May 2008



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