Discovery of a high-redshift Einstein ring

2; 3); 4); A. O. Jaunsen (2); C. Lidman (2); D. Valls-Gabaud (3; H. Jerjen (5) ((1) PUC (2) ESO Chile (3) CFHT (4) OMP Toulouse (5) Mt-Stromlo); R. A. Cabanac (1

Discovery of a high-redshift Einstein ring

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arxiv astro-ph/0504585 v1 pith:VKSFE2AS submitted 2005-04-27 astro-ph

R. A. Cabanac (1 , 2 , 3) , D. Valls-Gabaud (3 , 4) , A. O. Jaunsen (2) , C. Lidman (2) , H. Jerjen (5) ((1) PUC (2) ESO Chile (3) CFHT (4) OMP Toulouse (5) Mt-Stromlo) This is my paper · ORCID

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We report the discovery of a partial Einstein ring of radius 1.48arcsec produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2L* galaxy at z=0.986, which is lensing a post-starburst galaxy at z=3.773. This unique configuration yields a very precise measure of the mass of the lens within the Einstein radius, (8.3e11 +- 0.4)/h70 Msolar. The fundamental plane relation indicates an evolution rate of d [log (M/L)B] / dz = -0.57+-0.04, 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.

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