4 papers
Gravitational lensing statistics with extragalactic surveys. II. Analysis of the Jodrell Bank-VLA Astrometric Survey
P. Helbig, D. R. Marlow, R. Quast +3
We present constraints on the cosmological constant from gravitational lensing statistics of the Jodrell Bank-VLA Astrometric Survey (JVAS). Although this is the largest gr…
Measuring Cosmological Parameters with the JVAS and CLASS Gravitational Lens Surveys
P. Helbig, R. D. Blandford, I. W. A. Browne +11
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 r…
Time delay for the gravitational lens system B0218+357
A. D. Biggs, I. W. A. Browne, P. Helbig +3
Measurement of the time delay between multiple images of a gravitational lens system is potentially an accurate method of determining the Hubble constant over cosmological distance…
Cosmological parameters and the redshift distribution of gravitational lenses
Phillip Helbig, Rainer Kayser
For known gravitational lens systems the redshift distribution of the lenses is compared with theoretical expectations for ~Friedmann-Lema\^ıtre~cosmological models, which…