[en] We present an update of the status of the Cosmic Lens All-Sky Survey (CLASS). Twelve lenses have been found to date in CLASS together with the earlier Jodrell Bank-VLA Astrometric Survey (JVAS). Six other sources are under investigation as possible lenses. To date, all lens systems studied optically have been shown to have associated lensing galaxies to a limiting I magnitude of 23-24. These observations place severe constraints on published claims that dark ( M/L > 100 ) galaxies form a significant fraction of the general population of galaxies.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jackson, N.; NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL England
Helbig, Phillip ; NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL England
Browne, I. W. A.; NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL England
Koopmans, L.; Kapteyn Astronomical Institute, University of Groningen, Netherlands)
Language :
English
Title :
Light on dark lenses
Publication date :
01 August 1998
Event name :
Gravitational Lensing: Nature's Own Weighing Scales