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MULTIPOLE GRAVITATIONAL LENSING AND HIGH-ORDER PERTURBATIONS ON THE QUADRUPOLE LENS
Chu, Z.1,2; Lin, W. P.1,2; Li, G. L.3; Kang, X.4
2013-03-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume765Issue:2Pages:134(10PP)
Corresponding AuthorChu, Z (reprint author), Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China. Email: chuzhe@shao.ac.cn ; linwp@shao.ac.cn
AbstractAn arbitrary surface mass density of the gravitational lens can be decomposed into multipole components. We simulate the ray tracing for the multipolar mass distribution of the generalized Singular Isothermal Sphere model based on deflection angles, which are analytically calculated. The magnification patterns in the source plane are then derived from an inverse shooting technique. As has been found, the caustics of odd mode lenses are composed of two overlapping layers for some lens models. When a point source traverses this kind of overlapping caustics, the image numbers change by +/- 4, rather than +/- 2. There are two kinds of caustic images. One is the critical curve and the other is the transition locus. It is found that the image number of the fold is exactly the average value of image numbers on two sides of the fold, while the image number of the cusp is equal to the smaller one. We also focus on the magnification patterns of the quadrupole (m = 2) lenses under the perturbations of m = 3, 4, and 5 mode components and found that one, two, and three butterfly or swallowtail singularities can be produced, respectively. With the increasing intensity of the high-order perturbations, the singularities grow up to bring sixfold image regions. If these perturbations are large enough to let two or three of the butterflies or swallowtails make contact, then eightfold or tenfold image regions can be produced as well. The possible astronomical applications are discussed.
KeywordGravitational Lensing: Strong Methods: Analytical Methods: Numerical
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/765/2/134
WOS KeywordMASS PROFILES ; GALAXIES ; MAGNIFICATION ; SUBSTRUCTURE ; SIMULATIONS ; MODELS ; IMAGES ; CLASSIFICATION ; ELLIPTICITY ; STATISTICS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000315921500059
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9907
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Acad Sinica, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Acad Sinica, Purple Mt Observ, Partner Grp MPI Astron, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Chu, Z.,Lin, W. P.,Li, G. L.,et al. MULTIPOLE GRAVITATIONAL LENSING AND HIGH-ORDER PERTURBATIONS ON THE QUADRUPOLE LENS[J]. ASTROPHYSICAL JOURNAL,2013,765(2):134(10PP).
APA Chu, Z.,Lin, W. P.,Li, G. L.,&Kang, X..(2013).MULTIPOLE GRAVITATIONAL LENSING AND HIGH-ORDER PERTURBATIONS ON THE QUADRUPOLE LENS.ASTROPHYSICAL JOURNAL,765(2),134(10PP).
MLA Chu, Z.,et al."MULTIPOLE GRAVITATIONAL LENSING AND HIGH-ORDER PERTURBATIONS ON THE QUADRUPOLE LENS".ASTROPHYSICAL JOURNAL 765.2(2013):134(10PP).
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