CLASS B 1359 + 154: Modelling Lensing by a Group of Galaxies

Journal of astrophysics and astronomy

Sunita Nair¹ 

[1] Raman Research Institute, Bangalore 560 080, India$$

关键词: Gravitational lensing: multiple-imaging;    individual systems: CLASS B1359 + 154;    galaxy groups;    dark matter.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The recently discovered gravitationally lensed system CLASS B1359+154 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).

【 授权许可】

Unknown