Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf..233r&link_type=abstract
13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 233 - 240
Other
Scientific paper
The authors present astrometric results and maps from simultaneous MERLIN and Global VLBI observations of the very weak core of the double-lobed radio source 1636+47B, using as reference the bright, compact, flat-spectrum quasar 1636+473 A, 20 arcsec away. The observations were made in May 1995 at 5 GHz. The phase-referenced VLBI map of the weak core, of resolution 1.5 mas, contains a high percentage of the core flux density seen in the MERLIN map. Further hybrid mapping iterations reveal a faint, one-sided core extension on the same side as the MERLIN jet. The authors investigate the effect of the stucture in the strong quasar core on the astrometric separation measurement, and explore the effect of both temporal and other coherence losses on the phase-reference map. They relate the results to the structural asymmetry in weak AGN cores within the context of unification models.
Alberdi Antonio
Garrington Simon
Porcas Richard W.
Rioja Maria J.
Saikia D. J.
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