Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-08-19
Astronomy and Astrophysics
Astrophysics
LaTeX file, 13 pages incl. 3 Postscript figures, uses AASTeX v4.0
Scientific paper
10.1086/310938
We have produced deep radio maps of the double quasar 0957+561 from multiple-epoch VLA observations. To achieve high sensitivity to extended structure we have re-reduced the best available 1.6 GHz observations and have combined 5 GHz data from multiple array configurations. Regions of faint emission approximately 15 arcsec north and south of the radio source G are probably lobes associated with the lensing galaxy. An arc 5 arcsec to the east of G may be a stretched image of emission in the background quasar's environment. 1.4 arcsec southwest of G we detect a source that we interpret as an image of emission from the quasar's western lobe, which could provide a constraint on the slope of the gravitational potential in the central region of the lens. We explore the consequences of these new constraints with simple lens models of the system.
Avruch Ian M.
Burke Bernard F.
Cohen Seth A.
Conner Sam R.
Haarsma Deborah B.
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