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Astron. Astrophys. 343, L35-L39 (1999)

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Letter to the Editor

A VLT colour image of the optical Einstein ring 0047-2808 *

S.J. Warren 1, G.F. Lewis 2, P.C. Hewett 3, P. Moller 4, P. Shaver 4 and A. Iovino 5

1 Blackett Laboratory, Imperial College of Science Technology and Medicine, Prince Consort Rd, London SW7 2BZ, UK (s.j.warren@ic.ac.uk)
2 Department of Physics and Astronomy, University of Victoria, PO Box 3055, Victoria BC, V8W 3P7, Canada (gfl@almuhit.phys.uvic.ca)
and Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195-1580, USA
3 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK (phewett@ast.cam.ac.uk)
4 European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany (pmoller; pshaver@eso.org)
5 Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy (ovino@brera.mi.astro.it)

Received 1 December 1998 / Accepted 19 January 1999

Abstract

The optical Einstein ring 0047-2808 was imaged by the VLT UT1 during the science verification programme. The ring is the image of a high-redshift [FORMULA] star-forming galaxy, with strong Ly[FORMULA] emission at 5589Å, gravitationally lensed by a massive early-type galaxy at [FORMULA]. Relative to earlier NTT data the high signal-to-noise ratio of the VLT Ly[FORMULA] narrow-band image allows much improved constraints to be placed on the surface-brightness profile of the source and on the mass, leading to a measured mass-to-light ratio of [FORMULA] for the deflector galaxy. We have combined the VLT B-band and Ly[FORMULA] narrow-band images with a K-band image obtained at UKIRT to produce a deep colour image of the system.

Key words: galaxies: formation – cosmology: gravitational lensing

* Based on observations obtained at the European Southern Observatory, Paranal, Chile, and the United Kingdom Infrared Telescope, Hawaii

Send offprint requests to: S.J. Warren

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© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999
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