A wider audience: Turning VLBI into a survey instrument
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Radio observations using the Very Long Baseline Interferometry (VLBI) technique typically have fields of view of only a few arcseconds, due to the computational problems inherent in imaging larger fields. Furthermore, sensitivity limitations restrict observations to very compact and bright objects, which are few and far between on the sky. Thus, while most branches of observational astronomy can carry out sensitive, wide-field surveys, VLBI observations are limited to targeted observations of carefully selected objects. However, recent advances in technology have made it possible to carry out the computations required to target hundreds of sources simultaneously. Furthermore, sensitivity upgrades have dramatically increased the number of objects accessible to VLBI observations. The combination of these two developments have enhanced the survey capabilities of VLBI observations such that it is now possible to observe (almost) any point in the sky with milli-arcsecond resolution. In this talk I review the development of wide-field VLBI, which has made significant progress over the last three years.
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Middelberg, E.; Deller, A.; Morgan, J.; Rottmann, H.; Alef, W.; Tingay, Steven; Norris, R.; Bach, U; Brisken, W.; Lenc, E. (2011)Context: Wide-field surveys are a commonly-used method for studying thousands of objects simultaneously, to investigate, e.g., the joint evolution of star-forming galaxies and active galactic nuclei. Very long baseline ...
Middelberg, E.; Dellar, A; Norris, R.; Fotopoulou, S.; Salvato, M.; Morgan, John; Brisken, W.; Lutz, D.; Rovilos, E. (2013)Active galactic nuclei (AGN) play a decisive role in galaxy evolution, particularly so when they launch powerful jets, which reshape their surroundings. However, identifying them is difficult, since radio observations ...
Lenc, E.; Garrett, M.; Wucknitz, O.; Anderson, J.; Tingay, Steven (2008)We report on the first wide-field, very long baseline interferometry (VLBI) survey at 90 cm. The survey area consists of two overlapping 28 deg2 fields centered on the quasar J0226+3421 and the gravitational lens B0218+357. ...