Journal Article

SDSS J120923.7+264047: a new massive galaxy cluster with a bright giant arc

Eran O. Ofek, Stella Seitz and Felix Klein

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 1, pages 311-314
Published in print September 2008 | ISSN: 0035-8711
Published online August 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13563.x
SDSS J120923.7+264047: a new massive galaxy cluster with a bright giant arc

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Highly magnified lensed galaxies allow us to probe the morphological and spectroscopic properties of high-redshift stellar systems in great detail. However, such objects are rare, and there are only a handful of lensed galaxies that are bright enough for a high-resolution spectroscopic study with current instrumentation. We report the discovery of a new massive lensing cluster, SDSS J120923.7+264047, at z= 0.558. Present around the cluster core, at angular distances of up to ∼40 arcsec, are many arcs and arc candidates, presumably due to lensing of background galaxies by the cluster gravitational potential. One of the arcs, 21 arcsec long, has an r-band magnitude of 20, making it one of the brightest known lensed galaxies. We obtained a low-resolution spectrum of this galaxy, using the Keck-I telescope, and found it is at redshift of z= 1.018.

Keywords: gravitational lensing; galaxies: clusters: individual: SDSS J120923.7+264047; galaxies: high-redshift

Journal Article.  2292 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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