HST Observations of a 'clusterless' Giant Arc Centered on 3c 220.1

Details HST Observations of a 'clusterless' Giant Arc Centered on 3c 220.1 HST Observations of a 'clusterless' Giant Arc Centered on 3c 220.1

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6778d&link_type=abstract

HST Proposal ID #6778

Physics

Hst Proposal Id #6778 Cosmology

Scientific paper

In an imaging survey of the cluster environments of distantradio galaxies, we have discovered a giant arc centered on 3C220.1. At z = 0.62, this is the most distant known lensresponsible for a giant arc. We have spectroscopicallymeasured the arc redshift to be z = 1.49. While the arcsuggests a very large lensing mass, the radio galaxy issituated in, at most, a very poor group of galaxies. The lensmass and mass--to--light ratio within the critical radius ofthe arc are unprecedentedly large for a single ellipticalgalaxy. WFPC2 observations can resolve the structure of thisarc and confirm the reality of a possible counter--image seenclose to the radio galaxy, to produce a detailed model of thelensing mass. Moreover, the lens is strong enough thatsignificant weak lensing distortions of the faint backgroundgalaxies are expected, thereby probing the mass distributionbeyond the critical radius.

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