Volume 436, Number 2, June III 2005
|Page(s)||L21 - L25|
|Published online||30 May 2005|
Letter to the Editor
Discovery of a high-redshift Einstein ring
Dep. de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile e-mail: email@example.com
2 European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago, Chile
3 Canada-France-Hawaii Telescope, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, USA
4 CNRS UMR 5572, LATT, Observatoire Midi-Pyrénées, 14 Av. E. Belin, 31400 Toulouse, France
5 Research School of Astronomy and Astrophysics, ANU, Mt. Stromlo Observatory, Weston ACT 2611, Australia
Accepted: 26 April 2005
We report the discovery of a partial Einstein ring of radius 148 produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2 galaxy at , which is lensing a post-starburst galaxy at . This unique configuration yields a very precise measure of the mass of the lens within the Einstein radius, . The fundamental plane relation indicates an evolution rate of , similar to other massive ellipticals at this redshift. The source galaxy shows strong interstellar absorption lines indicative of large gas-phase metallicities, with fading stellar populations after a burst. Higher resolution spectra and imaging will allow the detailed study of an unbiased representative of the galaxy population when the universe was just 12% of its current age.
Key words: cosmology: observations / gravitational lensing / galaxies: high-redshift / ellipticals / evolution / FOR J0332-3557
© ESO, 2005
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