中国科学院紫金山天文台机构知识库
Advanced  
PMO OpenIR  > 星系宇宙学和暗能量研究团组  > 期刊论文
题名: Magnification relations of quad lenses and applications on Einstein crosses
作者: Chu, Zhe; Li, G. L.; Lin, W. P.; Pan, H. X.
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2016
卷号: 461, 期号:4, 页码:4466-4476
英文摘要: In this work, we mainly study the magnification relations of quad lens models for cusp, fold and cross configurations. By dividing and ray-tracing in different image regions, we numerically derive the positions and magnifications of the four images for a point source lying inside of the astroid caustic. Then, based on the magnifications, we calculate the signed cusp and fold relations for the singular isothermal elliptical lenses. The signed fold relation map has positive and negative regions, and the positive region is usually larger than the negative region as has been confirmed before. It can also explain that for many observed fold image pairs, the fluxes of the Fermat minimum images are apt to be larger than those of the saddle images. We define a new quantity cross relation R-cross which describes the magnification discrepancy between two minimum images and two saddle images. Distance ratio d(sadd)/d(mini) is also defined as the ratio of the distance of two saddle images to that of two minimum images. We calculate the cross relations and distance ratios for nine observed Einstein crosses. In theory, for most of the quad lens models, the cross relations decrease as the distance ratios increase. In observation, the cross relations of the nine samples do not agree with the quad lens models very well, nevertheless, the cross relations of the nine samples do not give obvious evidence for anomalous flux ratio as the cusp and fold types do. Then, we discuss several reasons for the disagreement, and expect good consistencies for more precise observations and better lens models in the future.
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16884
Appears in Collections:星系宇宙学和暗能量研究团组_期刊论文

Files in This Item:
File Name/ File Size Content Type Version Access License
2016094.pdf(1088KB)期刊论文作者接受稿限制开放View 联系获取全文
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Chu, Zhe]'s Articles
[Li, G. L.]'s Articles
[Lin, W. P.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Chu, Zhe]‘s Articles
[Li, G. L.]‘s Articles
[Lin, W. P.]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: 2016094.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院紫金山天文台 - Feedback
Powered by CSpace