Browne, I. W. A. and Jackson, N. J. and Augusto, P. and Henstock, D. R. and Marlow, D. R. and Nair, S. and Wilkinson, P. N. and de Bruyn, A. G. and Koopmans, L. and Bremer, M. N. and Myers, S. T. and Fassnacht, C. D. and Blandford, R. D. and Pearson, T. J. and Readhead, A. C. S. and Womble, D. and Patnaik, A. R. (1998) The JVAS/Class Gravitational Lens Surveys. In: Observational Cosmology With the New Radio Surveys. Astrophysics and Space Science Library. No.226. Springer , Dordrecht, pp. 323-332. ISBN 978-94-010-6205-3. https://resolver.caltech.edu/CaltechAUTHORS:20190605-151715652
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Abstract
The JVAS/CLASS surveys are designed to find gravitational lens systems in which the flat spectrum cores of radio sources are multiply imaged. The prime motivation for the searches is to find systems from which the Hubble constant can be determined by measuring time delays and to produce statistically clean samples of lenses which can be used for cosmological investigations. Up to now some 8000 flat spectrum sources have been mapped with the VLA with a resolution of 200 mas. When complete we hope to have surveyed 10,000 sources. High resolution MERLIN and VLBA follow-up of the candidates is still in progress. To date 11 lens systems have been discovered. Time delays have been measured for 2 of these systems. HST and other observations almost always show a lensing galaxy so there is no evidence for “dark lenses”. The maximum image separations peak between 1 and 2 arcsec.
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| Additional Information: | © 1998 Springer Science+Business Media Dordrecht. This research was supported in part by European Commission, TMR Programme, Research Network Contract ERBFMRXCT96-0034 "CERES". | ||||||||||||
| Group: | TAPIR | ||||||||||||
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| Subject Keywords: | Radio Source; Compact Object; Flux Density Ratio; Lens System; Flat Spectrum | ||||||||||||
| Series Name: | Astrophysics and Space Science Library | ||||||||||||
| Issue or Number: | 226 | ||||||||||||
| DOI: | 10.1007/978-94-011-5238-9_57 | ||||||||||||
| Record Number: | CaltechAUTHORS:20190605-151715652 | ||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190605-151715652 | ||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
| ID Code: | 96166 | ||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||
| Deposited On: | 06 Jun 2019 03:15 | ||||||||||||
| Last Modified: | 19 Jan 2023 00:22 |
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