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Published February 1, 2003 | Published + Accepted Version
Journal Article Open

CLASS B0445+123: a new two-image gravitational lens system


A new two-image gravitational lens system has been discovered as a result of the Cosmic Lens All-Sky Survey. Radio observations with the Very Large Array (VLA), the MultiElement Radio Linked Interferometer Network and the Very Long Baseline Array at increasingly higher resolutions all show two components with a flux density ratio of ∼7 : 1 and a separation of 1.34 arcsec. Both components are compact and have the same spectral index. Follow-up observations made with the VLA at 8.4 GHz show evidence of a feature to the south-east of the brighter component and a corresponding extension of the weaker component to the north-west. Optical observations with the William Herschel Telescope show ∼1.7-arcsec extended emission aligned in approximately the same direction as the separation between the radio components with an R-band magnitude of 21.8 ± 0.4.

Additional Information

© 2003 RAS. Accepted 2002 October 3. Received 2002 October 3. MERLIN is run by the University of Manchester as a National Facility on behalf of PPARC. The WHT is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias The observations made with the WHT were carried out as part of the ING Service Programme. The VLA and the VLBA are operated by the National Radio Astronomy Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. We thank the W. M. Keck foundation for the generous grant that made the W. M. Keck Observatory possible. MA acknowledges support from the summer student programme at Jodrell Bank Observatory, University of Manchester. JPM, MN, PMP and TY thank PPARC for support in the form of postgraduate studentships.

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