Light on dark lenses

N. Jackson*, P. Helbig, I. W. A. Browne, L. Koopmans

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


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.
Original languageEnglish
Pages (from-to)97-100
Number of pages4
JournalNew Astronomy Reviews
Issue number2
Publication statusPublished - 1-Aug-1998

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