Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.7106r&link_type=abstract
American Astronomical Society Meeting 208, #71.06; Bulletin of the American Astronomical Society, Vol. 38, p.149
Other
Scientific paper
The quasar 3C454.3 is a bright superluminal radio source with a complex structure characterized at 3.6 cm by a compact "core" component on the easterly side, a second component about 0.5 mas to the west, and an extended milliarcsecond-scale jet with a brightness peak located about 5 mas to the northwest. We use this source, together with the compact quasar 2250+194 and the extragalactic source 2252+172, as a reference source for our 3.6 cm VLBI determination of the proper motion of HR 8703, the guide star for the NASA/Stanford Gravity Probe B (GP-B) mission. Using VLBI imaging, phase-delay fitting, and Kalman-filter analysis, we obtain a preliminary upper limit of about 0.05 mas/yr on the proper motion of the core component of 3C454.3 relative to the brightness peak of one of the other two reference sources, 2250+194. This limit is adequate to meet the astrometric accuracy requirements of GP-B. The second component and the brightness peak of the extended jet of 3C454.3 are moving away from the core component at speeds of up to about 0.1 mas/yr.
Bartel Norbert
Bietenholz Michael F.
Lebach Daniel Eugene
Lederman J. I.
Ransom Ryan R.
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