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
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号461期号:4页码:4466-4476
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.
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16884
专题星系宇宙学和暗能量研究团组
推荐引用方式
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.
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