NRAO/Socorro Colloquium Series
Enno Middelberg
Ruhr-Universitat Bochum
A Wider Audience: Turning VLBI into a Survey Instrument
Radio observations using the Very Long Baseline
Interferometry (VLBI) technique typically have fields of view of
only a few arcseconds. Thus, while most branches of observational
astronomy can carry out sensitive, wide-field surveys, VLBI
observations are limited to well-selected, very compact objects,
which are sparsely distributed on the sky. Recent advances in
technology have made it possible to carry out the computations
required to target hundreds of sources simultaneously, and recent
sensitivity upgrades have dramatically increased the number of
objects accessible to VLBI observations. The combination of these
two developments have made it possible to image large numbers of
objects in a typical 12h observation, enabling observers to carry
out VLBI survey science. In this talk I will review the recent
developments in wide-field VLBI, including new calibration
techniques, and then present results from two surveys which have
used these techniques to target hundreds of radio sources to
search for AGN.
February 15, 2013
11:00 am
Array Operations Center Auditorium
All NRAO employees are invited to attend via
video, available in Charlottesville Room 230, Green Bank Room 137 and
Tucson N525.
Local Host: Emmanuel Momjian
