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Published May 8, 1980 | public
Journal Article

IR observations of the double quasar 0957 + 561 A, B and the intervening galaxy


The properties of the remarkable double quasar 0957 + 561 were first described by Walsh et al. Recently Young et al. have described CCD observations of a distant galaxy associated with the quasar pair, and have identified this galaxy as a gravitational lens forming a double image of a single quasar. We report here 1.2–2.2-µm observations of the system that support the conclusion that the twin quasars are a pair of images of a single object; the quasar has an energy distribution that is unusual. The intervening galaxy is shown to be highly luminous with a bolometric luminosity of about 2 × 10^(11) L.

Additional Information

© 1980 Nature Publishing Group. Received 22 January; accepted 26 February 1980. We thank J. Gunn, J. Oke, S. Persson, A. Stockton, D. Walsh, G. Rieke, and P. Young for discussions and for letting us see their data before publication. We also thank our telescope operators J. Carrasco, R. Koehler and B. Shaeffer. This work was supported by NASA grants NGL 05-002-207 and NASW-3159 and NSF grants AST 77-20516 and AST 78-26028. B.T.S., G.N. and C.G.W-W. are visiting astronomers at the NASA IR Telescope Facility of Mauna Kea, Hawaii.

Additional details

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March 5, 2024