Constraining the Value of the Cosmological Constant Using JVAS/CLASS Lensing Statistics
- Marlow, D. R.
- Wilkinson, P. N.
- Helbig, Phillip
- Browne, I. W. A.
- Jackson, N.
- Perez-Fournon, I.
Publication date
January 1998
DOI Publisher
Springer Science and Business Media LLCAbstract
The Jodrell Bank VLA Astrometric Survey (JVAS) and the Cosmic Lens All-Sky Survey (CLASS) aim to observe 10,000 flat spectrum radio sources. So far approximately 7,500 have been observed with the VLA and mapped with a resolution of 0.2 arcseconds. One of the main objectives of the surveys is to obtain reliable statistics on the frequency and properties of lens systems for cosmological studies---Hubble's constant may be derived from time delays between variations of lens images and the cosmological constant from lensing statistics.CERE
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