期刊
ASTRONOMY & ASTROPHYSICS
卷 447, 期 2, 页码 419-430出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053762
关键词
gravitational lensing; galaxies : clusters : general; dark matter
Strong gravitational lensing by irregular mass distributions, Such as galaxy clusters, is generally not quantified well by cross sections of analytic mass models. Computationally expensive ray-tracing methods have so far been necessary for accurate cross-section calculations. We describe a fast, semi-analytic method here that is based oil surface integrals over high-magnification regions in the lens plane and demonstrate that it yields reliable cross sections even for complex, asymmetric mass distributions. The method is faster than ray-tracing Simulations by factors of similar to 30 and thus suitable for large cosmological simulations, saving large amounts of computing time. We apply this method to a sample of galaxy cluster-sized dark matter haloes with simulated merger trees and show that Cluster mergers approximately double the strong-lensing optical depth for lens redshifts z(1) greater than or similar to 0.5 and sources near z(s) = 2. We believe that this result hints at one possibility for understanding the recently detected high arcs abundance in clusters at moderate and high redshifts, and is thus Worth Studying further.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据