The complex gravitational lens system B1933+503

Creators: Sykes, C. M.; Browne, I. W. A.; Jackson, N. J.; Marlow, D. R.; Nair, S.; Wilkinson, P. N.; Blandford, R. D.; Cohen, J.; Fassnacht, C. D.; Hogg, D.; Pearson, T. J.; Readhead, A. C. S.; Womble, D. S.; Myers, S. T.; de Bruyn, A. G.; Bremer, M.; Miley, G. K.; Schilizzi, R. T.

Abstract

We report the discovery of the most complex arcsec-scale radio gravitational lens system yet known. B1933+503 was found during the course of the CLASS survey and MERLIN and VLA radio maps reveal up to 10 components. Four of these are compact and have flat spectra; the rest are more extended and have steep spectra. The background lensed object appears to consist of a flat-spectrum core (quadruply imaged) and two compact 'lobes' symmetrically disposed relative to the core. One of the lobes is quadruply imaged while the other is doubly imaged. An HST observation of the system with the WFPC2 shows a galaxy with an axial ratio of 0.5, but none of the images of the background object is detected. A redshift of 0.755 has been measured for the lens galaxy.

Additional Information

© 1998 RAS. Accepted 1998 August 3. Received 1997 October 27; in original form 1997 September 5. This research used observations with the Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by Associated Universities for Research in Astronomy Inc. under NASA contract NAS5-26555. The Very Large Array is operated by Associated Universities for Research in Astronomy Inc. on behalf of the National Science Foundation. We thank the W. M. Keck foundation for the generous grant that made the W. M. Keck Observatory possible. MERLIN is operated as a National Facility by NRAL, University of Manchester, on behalf of the UK Particle Physics & Astronomy Research Council. This work was supported in part by the US National Science Foundation under grant AST-9420018 and in part by the European Commission, TMR Programme, Research Network Contract ERBFMRXCT96-0034 'CERES'. CMS and DRM have been supported by PPARC studentships.

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