PMO OpenIR  > 星系宇宙学和暗能量研究团组
Magnification relations of quad lenses and applications on Einstein crosses
Chu, Zhe; Li, G. L.; Lin, W. P.; Pan, H. X.
2016
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume461Issue:4Pages:4466-4476
AbstractIn 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.
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16884
Collection星系宇宙学和暗能量研究团组
Recommended Citation
GB/T 7714
Chu, Zhe,Li, G. L.,Lin, W. P.,et al. Magnification relations of quad lenses and applications on Einstein crosses[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,461(4):4466-4476.
APA Chu, Zhe,Li, G. L.,Lin, W. P.,&Pan, H. X..(2016).Magnification relations of quad lenses and applications on Einstein crosses.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,461(4),4466-4476.
MLA Chu, Zhe,et al."Magnification relations of quad lenses and applications on Einstein crosses".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 461.4(2016):4466-4476.
Files in This Item:
File Name/Size DocType Version Access License
2016094.pdf(1088KB)期刊论文作者接受稿开放获取Apache LicenseView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Chu, Zhe]'s Articles
[Li, G. L.]'s Articles
[Lin, W. P.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Chu, Zhe]'s Articles
[Li, G. L.]'s Articles
[Lin, W. P.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Chu, Zhe]'s Articles
[Li, G. L.]'s Articles
[Lin, W. P.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2016094.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

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