A Caltech Library Service

Measuring Cosmological Parameters with the JVAS and CLASS Gravitational Lens Surveys

Helbig, P. and Blandford, R. D. and Browne, I. W. A. and de Bruyn, A. G. and Fassnacht, C. D. and Jackson, N. and Koopmans, L. V. E. and Macías-Pérez, J. F. and Marlow, D. R. and Myers, S. T. and Quast, R. and Rusin, D. and Wilkinson, P. N. and Xanthopoulos, E. (1999) Measuring Cosmological Parameters with the JVAS and CLASS Gravitational Lens Surveys. . (Unpublished)

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


The JVAS (Jodrell Bank-VLA Astrometric Survey) and CLASS (Cosmic Lens All-Sky Survey) are well-defined surveys containing about ten thousand flat-spectrum radio sources. For many reasons, flat-spectrum radio sources are particularly well-suited as a population from which one can obtain unbiased samples of gravitational lenses. These are by far the largest gravitational (macro)lens surveys, and particular attention was paid to constructing a cleanly-defined sample for the survey itself and for the underlying luminosity function. Here we present the constraints on cosmological parameters, particularly the cosmological constant, derived from JVAS and combine them with constraints from optical gravitational lens surveys, ‘direct' measurements of Ω_0, H_0 and the age of the universe, and constraints derived from CMB anisotropies, before putting this final result into the context of the latest results from other, independent cosmological tests.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Blandford, R. D.0000-0002-1854-5506
Fassnacht, C. D.0000-0002-4030-5461
Koopmans, L. V. E.0000-0003-1840-0312
Additional Information:This research was supported in part by the European Commission, TMR Programme, Research Network Contract ERBFMRXCT96-0034 ‘CERES’. CERES, standing for the Consortium for European Research on Extragalactic Surveys, is an EU TMR Network, coordinated by Ian Browne at Jodrell Bank, and involving the Nuffield Radio Astronomy Laboratories of the Universtity of Manchester at Jodrell Bank, the Institute of Astronomy of the University of Cambridge, The Kapteyn Astronomical Institute of the University of Groningen, the Netherlands Foundation for Research in Astronomy at Dwingeloo, the University of Bologna and the University of Portugal. One of the main goals of CERES is the use of the JVAS and CLASS surveys for research in gravitational lensing. We thank our collaborators in the JVAS, CJF and CLASS surveys for useful discussions and for providing data in advance of publication and many colleagues at Jodrell Bank for helpful comments and suggestions. We also thank John Meaburn and Anthony Holloway at the Department of Astronomy in Manchester and the staff at Manchester Computing for providing us with additional computational resources. RQ is grateful to the CERES collaboration for making possible a visit to Jodrell Bank where part of this work was done.
Funding AgencyGrant Number
Marie Curie FellowshipERBFMRXCT96-0034
Record Number:CaltechAUTHORS:20190603-100453225
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96033
Deposited By: Tony Diaz
Deposited On:03 Jun 2019 18:44
Last Modified:02 Jun 2023 01:31

Repository Staff Only: item control page