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dc.contributor.authorNair, Sunita-
dc.identifier.citationJournal of Astrophysics and Astronomy, 2002, Vol. 23, p115-118.en
dc.description.abstractThe recently discovered gravitationally lensed system CLASS B1359C154 appears to have six detectable images of a single background source at a redshift of 3:235. A group of galaxies acts as the lens, at a redshift of ~ 1. The present work identifies two distinct, physically plausible image configurations, a 7-image one and a 9-image one. Mass models are constructed corresponding to realizations of these two configurations. Both models call for, in addition to non-singular galaxy-type lenses, a larger scale mass component that resembles the extended dark matter distributions seen in relatively low-redshift galaxy groups. It is presently observationally impossible to study the extended X-ray emission from a group at such a high redshift, hence lensing studies are of some interest. A lensed system with a high image multiplicity does not necessarily admit of a unique lensing interpretation; discrimination is possible with additional observable details (e.g., the image parities, which are uncommon among even the simpler systems).en
dc.format.extent575307 bytes-
dc.publisherIndian Academy of Sciences, Bangalore, India.en
dc.rightsIndian Academy of Sciences, Bangalore, India.en
dc.subjectGravitational lensingen
dc.subjectCLASS B1359 + 154en
dc.subjectGalaxy groupsen
dc.subjectDark matteren
dc.titleCLASS B 1359+154: Modelling lensing by a group of galaxiesen
Appears in Collections:Research Papers (A&A)

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