NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-15 T14:59:56 PDT
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For refcode 1990A&A...229...51C:
Retrieve 14 NED objects in this reference.
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...229...51C Fourteen extragalactic radio sources mapped at 2.3 and 8.4 GHz with a 24-hour Crustal Dynamics Program VLBI experiment P. Charlot Institut Geographique National/SGN, 2 Av. Pasteur, F-94160 Saint-Mande, France Received March 24, accepted July 6, 1989 Abstract. Fourteen extragalactic radio sources have been mapped at 2.3 and 8.4 GHz with a 24-hour Crustal Dynamics Program VLBI experiment on North- Pacific baselines in May 1985. Among these sources, five have never been by the VLBI technique and seven are superluminal sources. By comparing our maps with others at close or previous epochs, our main results are: a tentative proposition that the components of the newly mapped source OQ 208 evolve along a highly curved jet, a determination of the proper motion of the recently ejected jet component C_5_ in 3C345, evidence for a high spectral index gradient in the core region of 3C 454.3, and marginal indication for superluminal motion in DA 193. These maps also emphasize the great potential of Crustal Dynamics Program VLBI experiments to monitor radio source structures on intervals as short as a few months since ~ 1980. Key words: interferometry - radio sources: general - quasars: general - quasars: jets of - BL Lacertae objects - galaxies: active
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