Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-11-30
Astronomy and Astrophysics
Astrophysics
13 page LaTeX file (one non-crucial figure available on request), Caltech GRP-355
Scientific paper
A gravitational lens model of the radio quasar B1422+231 is presented which can account for the image arrangement and approximately for the relative magnifications. The locations of the principal lensing mass and a more distant secondary mass concentration were predicted and subsequently luminous galaxies 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 then 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 a 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.
Blandford Roger. D.
Hogg David Wardell
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