VLBI Observations of the Gravitational Lens System 0957+561

Details VLBI Observations of the Gravitational Lens System 0957+561 VLBI Observations of the Gravitational Lens System 0957+561

1995-09-25

arxiv.org/abs/astro-ph/9509125v1

Astronomy and Astrophysics

Astrophysics

11 pages, 3 PostScript figures, uses AAS LaTex style aaspp.sty, To appear in AJ (1995.12), Submitted 1995.07.06, Accepted 1995

Scientific paper

10.1086/117712

We present hybrid maps of the A and B images of 0957+561 from each of four sessions of 6 cm VLBI observations that span the six-year interval 1987-1993. The inner- and outer-jets are clearly detected, and confirm the structures reported previously. There is no evidence of change in the separation between the core and inner-jet components, so the prospect of measuring the time delay using differential proper motions is not promising. The flux density in the core of each image peaked between 1989 and 1992. From the variation in these flux densities, we obtain a time-delay estimate of $\sim$1 yr.

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