Low Surface Brightness Structure in the Field of the Gravitational Lens {\sf 0957+561}
Session 72 -- High Z Line Measurements; Gravitational Microlensing: Distance Determination
Display presentation, Friday, January 14, 9:30-6:45, Salons I/II Room (Crystal Gateway)

[72.09] Low Surface Brightness Structure in the Field of the Gravitational Lens {\sf 0957+561}

I.M. Avruch, D.J. Becker, S.R. Conner, B.F. Burke (MIT)

We have rereduced archival VLA data of the gravitational lens {\sf 0957+561} in a search for faint emission and better constraints on a model for the lensing potential. Observations at a variety of epochs (1980, 1988, 1990), wavelengths ($\lambda$ 6 cm, $\lambda$ 20 cm), and resolutions (A, B, and C arrays) reveal previously unreported low surface brightness structure. Two extended regions of emission separated by 30 arcseconds to the north and south of the lens may be consistently interpreted as radio lobes associated with the lensing galaxy. In addition, there is a steep spectrum arc extending from the northeast lobe of the background quasar, past the B image of the core, and connecting to the southern lobe of emission. It may originate at the position of the lensing galaxy, and could be either lensed or foreground emission.