Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published May 1, 1995 | Published
Journal Article Open

1600+434: a new gravitational lens system


We report the discovery of a new gravitational lens system associated with the flat-spectrum radio source 1600+434. The system has been found in a new large survey of such radio sources. It consists of a 1.4-arcsec double radio source with an associated optical double at the same position and orientation, and with an almost identical flux density ratio to that in the radio. Spectra of the light from two optical images show broad emission lines with a redshift of 1.61. The spectral data are not of sufficient quality to show that both images have identical spectra. Nevertheless, we argue that the probability that 1600+434 is indeed a lensed system is very high.

Additional Information

© 1995 Royal Astronomical Society. Accepted 1995 March 7. Received 1995 February 27. We acknowledge the communication of unpublished Texas Survey material which was used in the sample selection for the CLASS observations. The William Herschel Telescope is operated on the island of La Palma by the Royal Greenwich Observatory at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The Very Large Array is operated by the US National Radio Astronomy Observatory on behalf of the US National Science Foundation. The WSRT is operated by the NFRA with the financial support of the Netherlands Organization for Scientific Research (NWO).

Attached Files

Published - 1995MNRAS_274L__25J.pdf


Files (3.6 MB)
Name Size Download all
3.6 MB Preview Download

Additional details

August 20, 2023
October 25, 2023