Light on dark lenses

N. Jackson, Phillip Helbig, I. W. A. Browne & L. V. E. Koopmans

in Gravitational Lensing: Nature's Own Weighing Scales (ADS: 1998NewAR..42.....A)
H. AbdelSalam, K. Blundell, J. Miller & P. Saha (eds.)
New Astronomy Reviews 42, 2, 97–100 (1998)
Amsterdam: Elsevier


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&emdash;24. These observations place severe constraints on published claims that dark galaxies (more than one trillion solar masses but with normal luminosity) form a significant fraction of the general population of galaxies.


info and local links to full paper | DOI: 10.1016/S1387-6473(98)00028-1 | ADS: 1998NewAR..42...97J | Google Scholar
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