The Cosmic Horseshoe: Discovery of an Einstein Ring around a Giant Luminous Red Galaxy

V. Belokurov, N. W. Evans, A. Moiseev, L. J. King, P. C. Hewett, M. Pettini, L. Wyrzykowski, R. G. McMahon, M. C. Smith, G. Gilmore, S. F. Sanchez, A. Udalski, S. Koposov, D. B. Zucker, C. J. Walcher

Research output: Contribution to journalArticlepeer-review

Abstract

We report the discovery of an almost complete (~300°) Einstein ring of diameter 10'' in Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5). Spectroscopic data from the 6 m telescope of the Special Astrophysical Observatory reveal that the deflecting galaxy has a line-of-sight velocity dispersion in excess of 400 km s-1 and a redshift of 0.444, while the source is a star-forming galaxy with a redshift of 2.379. From its color, luminosity, and velocity dispersion, we argue that this is the most massive galaxy lens hitherto discovered
Original languageEnglish
JournalAstrophysical Journal Letters
DOIs
Publication statusPublished - 13 Nov 2007

Keywords

  • astro-ph

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