出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We revisit the “Cluster-Cluster” or multi-view VLBI technique from the perspective of its synergy
with the multi-beam features inherent in the Australian Square Kilometer Array Pathfinder
(ASKAP) and its potential to improve the outcomes of VLBI observations with ASKAP. We
include a list of candidate VLBI sites that already support or can be upgraded to support multiview
VLBI located in Australia and overseas, and which have common visibility with ASKAP.
The results of our previous cluster-cluster observations at 1.6 GHz demonstrated the advantages
of this configuration to calibrate the ionospheric distortions responsible for the loss of positional
accuracy at low frequencies, using multiple calibrators in a range between 1 to 6 degrees away
from the target. Therefore, we conclude that joint observations of ASKAP with other multi-view
sites using cluster-cluster techniques would improve the outcomes of the high spatial resolution
component of ASKAP applied to astrometric projects, achieving higher precision for many more
targets, and with lower detection thresholds. Also very wide-field VLBI mapping becomes a
possibility. Looking to the future, this would contribute to the development of new techniques
that are relevant for future high resolution observations with the SKA.
