Multi-epoch Study of Source Morphology in the Southern Hemisphere
Abstract
The International Celestial Reference Frame (ICRF) has been constructed using catalogs of radio quasars observed using the Very Long Baseline Interferometry (VLBI) technique. The VLBI technique defines the current ICRF and helps to improve its precision. The angular resolution available from VLBI measurements is on a scale of milliarcseconds to submilliarcseconds and provides the highest accuracy available at present. On this scale most extragalactic radio sources exhibit extended structures. In order to define the ICRF with the highest accuracy, observational efforts are required to find more compact sources and to monitor them. We report here our efforts to provide multi-epoch VLBI maps for southern sources observed through existing astrometric sessions. These images will be used to identify compact southern sources and to correct observations for source structure, thereby allowing improved relative astrometric accuracy.
- Publication:
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International VLBI Service for Geodesy and Astrometry 2014 General Meeting Proceedings: "VGOS: The New VLBI Network
- Pub Date:
- December 2014
- Bibcode:
- 2014ivs..conf..426B