Finding astrometric reference sources using the NVSS Survey

Details Finding astrometric reference sources using the NVSS Survey Finding astrometric reference sources using the NVSS Survey

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf..201p&link_type=abstract

Proceedings of the 15th Workshop Meeting on European VLBI for Geodesy and Astrometry. Institut d'Estudis Espacials de Catalunya,

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

The technique of phase-reference mapping can be used both for mapping faint radio sources and for relative astrometry measurements. One astrophysically interesting application of the latter is the registration of source maps made at different frequencies; for this the "reference" source should itself be achromatic. Here I describe a case study where the "target" source (the gravitational lens system B0218+357) is strong, so that phase-reference maps of the achromatic reference sources can be made, using the target source phase. This permits the use of relatively weak reference sources. I describe the selection of suitable sources from the NVSS survey, and MERLIN and EVN investigations of their compactness.

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