Lensing Degeneracies Revisited | Zendy

Prasenjit Saha | Zendy

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Lensing Degeneracies Revisited

Author(s) -

Prasenjit Saha

Publication year - 2000

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/301581

Subject(s) - degeneracy (biology) , weak gravitational lensing , magnification , physics , strong gravitational lensing , galaxy , gravitational lensing formalism , astrophysics , simple (philosophy) , gravitational lens , image (mathematics) , theoretical physics , optics , computer science , redshift , artificial intelligence , bioinformatics , philosophy , epistemology , biology

This paper shows that the mass-sheet degeneracy and other degeneracies inlensing have simple geometrical interpretations: they are mostly rescalings ofthe arrival-time surface. Different degeneracies appear in Local Group lensingand in cosmological lensing, because in the former the absolute magnificationis measured but the image structure is not resolved, whereas in the latter thereverse usually applies. The most dangerous of these is a combination we maycall the `mass-disk degeneracy' in multiply-imaging galaxy lenses, which maylead to large systematic uncertainties in estimates of cosmological parametersfrom these systems.Comment: To appear in AJ (circa Oct 2000

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