Proper Motion of Components in 4C 39.25

Details Proper Motion of Components in 4C 39.25 Proper Motion of Components in 4C 39.25

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2586g&link_type=abstract

Astronomical Journal v.110, p.2586

Astronomy and Astrophysics

Astronomy

25

Galaxies: Individual: 4C 39.25, Galaxies: Jets, Radio Lines: Galaxies, Galaxies: Active

Scientific paper

From a series of simultaneous 8.4 and 2.3 GHz VLBI observations of the quasar 4C 39.25 phase referenced to the radio source 0920+390, carried out in 1990-1992, we have measured the proper motion of component b in 4C 39.25: μalpha_=90+/-43 μas/yr, μdelta_ = 7+/-68 μas/yr, where the quoted uncertainties account for the contribution of the statistical standard deviation and the errors assumed for the parameters related to the geometry of the interferometric array, the atmosphere, and the source structure. This proper motion is consistent with earlier interpretations of VLBI hybrid mapping results, which showed an internal motion of this component with respect to other structural components. Our differential astrometry analyses show component b to be the one in motion. Our results thus further constrain models of this quasar.

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