CLASS: Cosmic Lens All-Sky Survey

S. T. Myers, N. Jackson, I. W. A. Browne, A. G. de Bruyn, A. C. S. Readhead, P. N. Wilkinson, C. D. Fassnacht, L. V. E. Koopmans, D. R. Marlow, M. Norbury, D. Rusin, A. D. Biggs, R. D. Blandford, Phillip Helbig, T. J. Pearson & E. Xanthopoulos

in Gravitational Lensing: Recent Progress and Future Goals (ADS: 2001ASPC..237.....B)
T. G. Brainerd & C. S. Kochanek (eds.)
San Francisco: Astronomical Society of the Pacific: PASP conference series No. 237, pp. 51–52 (2001)
ISBN 1-58381-074-9


Poster abstract

The Cosmic Lens All-Sky Survey (CLASS), is an international (USA, UK and Netherlands) collaborative program aimed at obtaining high- resolution radio images of over 10000 at-s pectrum radio sources in order to create the largest and best studied statistical sample of radio-loud gravitationally lensed systems. With this survey, combined with detailed studies of the lenses found therein, powerful constraints can be placed on the cosmography (ie. expansion rate, mean density, and cosmological constant) of the Universe. CLASS is aimed at identifying lenses where multiple images are formed from compact flat-spectrum radio sources, which should be easily identifable in the radio maps. In three observing "seasons" in 1994, 1995 and 1998, CLASS has observed over 12,000 radio sources. When combined with the JVAS survey, the CLASS sample contains over 15,000 images and at least 17 lenses, with 11 so far in CLASS as well as a number of candidates still being followed up. In this poster, we present a summary of the CLASS observations, the JVAX-CLASS sample, and statistics on subsamples of the survey.

Proceedings abstract

The Cosmic Lens All-Sky Survey (CLASS) is aimed at identifying lenses where multiple images are formed from compact flat-spectrum radio sources. In four observing "seasons" with the VLA A-array at 8.45 Ghz in 1994, 1995, 1998 and 1999, CLASS has observed over 12,000 radio sources. When combined with the JVAS survey, the CLASS sample contains over 15,000 images and at least 17 lenses, with 11 so far in CLASS as well as a number of candidates still being followed up. In this poster, we present a summary of the CLASS observations, the JVAS-CLASS sample, and statistics on subsamples of the survey.
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