VLBI Observations of the Gravitational Lens System 0957+561

Abstract

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.

11 pages, 3 PostScript figures, uses AAS LaTex style aaspp.sty, To appear in AJ (1995.12), Submitted 1995.07.06, Accepted 1995.08.17

Cited by in corpus (10)

• A deep search for 21cm absorption in high redshift damped Lyman-$\alpha$ systems
• Spin temperatures and covering factors for HI 21-cm absorption in damped Lyman-alpha systems
• The Radio Wavelength Time Delay of Gravitational Lens 0957+561
• Radio Identification of the X-ray Jet in the z=4.3 Quasar GB 1508+5714
• The 6 cm Light Curves of B0957+561, 1979-1994: New Features and Implications for the Time Delay
• A reassessment of the data and models of the gravitational lens Q0957+561
• The Spatial, Ionization, and Kinematic Conditions of the z=1.39 Damped Ly-alpha Absorber in Q0957+561 A,B
• The evolution of cold neutral gas and the star formation history
• Spectroscopy and polarimetry of the gravitationally lensed quasar Q0957+561
• The Central Component of Gravitational Lens Q0957+561