Discovery of a high-redshift Einstein ring

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dc.creatorCabanac, R. A.
dc.creatorValls-Gabaud, D.
dc.creatorJaunsen, A. O.
dc.creatorLidman, C.
dc.creatorJerjen, H.
dc.date2005-04-27
dc.date.accessioned2026-07-07T02:17:32Z
dc.date.available2026-07-07T02:17:32Z
dc.descriptionWe 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.
dc.description5 pages, 3 figures, accepted in A&A Let
dc.identifierhttps://arxiv.org/abs/astro-ph/0504585
dc.identifierhttp://arxiv.org/abs/astro-ph/0504585
dc.identifierAstron.Astrophys. 436 (2005) L21-L25
dc.identifierdoi:10.1051/0004-6361:200500115
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9205
dc.subjectAstrophysics
dc.titleDiscovery of a high-redshift Einstein ring
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