Observation of a Nearly Complete Einstein Ring at z=0.9 from the Blanco Cosmology Survey

Details Observation of a Nearly Complete Einstein Ring at z=0.9 from the Blanco Cosmology Survey Observation of a Nearly Complete Einstein Ring at z=0.9 from the Blanco Cosmology Survey

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347801b&link_type=abstract

American Astronomical Society, AAS Meeting #213, #478.01; Bulletin of the American Astronomical Society, Vol. 41, p.445

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the serendipitous discovery of a nearly complete Einstein ring in the Blanco Cosmology Survey. The Blanco Cosmology Survey is a 100sq deg survey of the southern galactic cap using the MOSAIC II imager on the 4m Blanco telescope at CTIO. The source galaxy is at redshift of 0.9 and is lensed by the brightest cluster galaxy (BCG) of a rich cluster at z=0.38 with a mass of 10^15 solar masses. We have obtained Gemini South GMOS spectra of the knots in the ring as well as spectra for about 50 cluster members. We will report on the spectroscopic analysis of the cluster members and the source. We will also show the results of modelling the lens using various gravitational lens models.

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