Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...336..385g&link_type=abstract
Astronomy and Astrophysics, v.336, p.385-392 (1998)
Astronomy and Astrophysics
Astrophysics
11
Astrometry, Techniques: Interferometric, Quasars: Individual: 1928+738, Quasars: Individual: 2007+777
Scientific paper
From two sets of very-long-baseline interferometry (VLBI) observations, one each at 5 GHz (1985.77) and at 2.3 and 8.4 GHz simultaneously (1988.83), of the quasar 1928+738 phase-referenced to the BL Lac object 2007+777, we infer a change in their relative position of 0.74+/-0.22 milliarcseconds (mas) along a position angle of -9°+/-25°, where the quoted standard errors account for errors in our models of the geometry of the interferometric array, the atmosphere, and the source structure. This change is interpreted as an (inadvertent) shift of the reference point selected in the structure of 1928+738, due to the presence of an emerging component; different opacity effects in the three observing frequency bands may also be a significant contributor.
Guirado Jose C.
Marcaide Juan Maria
Quirrenbach Andreas
Ratner M. I.
Ros Eduardo
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