Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7209a&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #72.09; Bulletin of the American Astronomical Society, Vol. 25, p.1403
Astronomy and Astrophysics
Astronomy
3
Scientific paper
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.
Avruch Ian M.
Becker Joerg D.
Burke Bernard F.
Conner Sam R.
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