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The double quasar Q0957 + 561 A, B - A gravitational lens image formed by a galaxy at Z = 0.39
Young, P.; Gunn, J. E.; Kristian, J.; Oke, J. B.; Westphal, J. A.
AA(Palomar Observatory, Pasadena, California), AB(Palomar Observatory, Pasadena, California), AC(Mount Wilson and Las Campanas Observatoires, Pasadena, California) AD(Palomar Observatory, Pasadena, California), AE(Palomar Observatory, Pasadena, California),
Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 507-520. (ApJ Homepage)
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NASA/STI Keywords:
Galactic Clusters, Gravitational Lenses, Quasars, Spatial Distribution, Astronomical Models, Gravitational Effects, Imaging Techniques, Mass Distribution
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Deep CCD pictures show a rich cluster of galaxies around the double quasar Q0957 + 561 as well as faint extended wings on the image of the southern quasar. Calculations of gravitational imaging by King model mass distributions show that the cluster and the brightest galaxy together, acting as a gravitational lens on the light from a single, more distant QSO, can easily reproduce all of the present observations. It is concluded that the double quasar is almost certainly the multiple image of a single object produced by a gravitational lens.

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Database: Astronomy
arXiv e-prints