Abstract
The properties of the remarkable double quasar 0957 + 561 were first described by Walsh et al.1. Recently Young et al.2 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 × 1011 L.
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References
Walsh, D., Carswell, R. F. & Weymann, R. J. Nature 279, 381 (1979).
Young, P., Gunn, J. E., Kristian, J., Oke, J. B. & Westphal, J. A. Preprint (1980).
Pooley, G. G. et al. Nature 280, 477 (1979).
Roberts, D. H., Greenfield, P. E. & Burke, B. F. Science 205, 894 (1979).
Neugebauer, G., Oke, J. B., Becklin, E. E. & Matthews, K. Astrophys. J. 230, 79 (1979).
Frogel, J. A., Persson, S. E., Aaronson, M. & Matthews, K. Astrophys. J. 220, 75 (1978).
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Soifer, B., Neugebauer, G., Matthews, K. et al. IR observations of the double quasar 0957 + 561 A, B and the intervening galaxy. Nature 285, 91–93 (1980). https://doi.org/10.1038/285091a0
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DOI: https://doi.org/10.1038/285091a0
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