Title:	CLASS B 1359+154: Modelling lensing by a group of galaxies
Authors:	Nair, Sunita
Keywords:	Gravitational lensing Multiple-imaging CLASS B1359 + 154 Galaxy groups Dark matter
Issue Date:	2002
Publisher:	Indian Academy of Sciences, Bangalore, India.
Citation:	Journal of Astrophysics and Astronomy, 2002, Vol. 23, p115-118.
Abstract:	The 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).
URI:	http://hdl.handle.net/2289/820
ISSN:	0250-6335
Copyright:	Indian Academy of Sciences, Bangalore, India.
Appears in Collections:	Research Papers (A&A)

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