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Published June 15, 1994 | Submitted + Published
Journal Article Open

The gravitational lens system B1422 + 231: dark matter, superluminal expansion and the Hubble constant


A gravitational lens model of the radio quasar B1422 + 231 is presented. The model can account for the image arrangement and it can account approximately for the relative magnifications. The locations of the principal lensing mass and a more distant secondary mass concentration were predicted and subsequently luminous objects were found at these locations. This argues against the existence of substantial numbers of 'dark' galaxies. The model suggests that, if the compact radio source is intrinsically superluminal, the observed component motions may be as large as ∼100c with image B moving in the opposite direction to images A and C. The prospects for measuring the Hubble constant from a model incorporating lens galaxy locations, compact radio source expansion speeds and radio time delays, if and when these are measured, are briefly assessed.

Additional Information

© 1994 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Received: 28 July 1993; Revision Received: 03 December 1993; Accepted: 18 January 1994. We thank Ian Browne (the referee), Erica Ellingson, Chris Kochanek, Walter Landry, James Larkin, Charles Lawrence, Gerry Neugebauer, Alok Patnaik, Tony Readhead, Peter Schneider, Tom Soifer and Howard Yee for valuable discussions and encouragement. Support under the NSF Graduate Fellowship programme and NSF grants AST 89-17765 and AST 92-23370 is gratefully acknowledged.

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Submitted - 9311077.pdf

Published - mnras268-0889.pdf


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