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American Astronomical Society, Astrophysical Journal, 2(513), p. L91-L94, 1999

DOI: 10.1086/311924

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A possible gravitational lens in the Hubble Deep Field South

Journal article published in 1998 by Rennan Barkana, Roger Blandford, David W. Hogg ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We model an apparent gravitational lens system HDFS 2232509-603243 in the Hubble Deep Field South. The system consists of a blue V=25 mag arc separated by 0.9 arcsec from a red V=22 mag elliptical galaxy. A mass distribution which follows the observed light distribution with a constant mass-to-light ratio can fit the arc component positions if external shear is added. A good fit is also obtained with simple parameterized models, and all the models predict a forth image fainter than the detection limit. The inferred mass-to-light ratio is roughly 15 in solar units if the lens is at redshift 0.6. The lens models predict a velocity dispersion of about 280 km/s which could be confirmed with spectroscopy. ; Comment: 12 pages, 3 PostScript figures, accepted by ApJL. Revised to account for the referee's report, also some rewriting