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Gravitational Lensing Model Degeneracies: Is Steepness All-Important?

The Astrophysical journal, 2006-12, Vol.653 (2), p.936-941 [Peer Reviewed Journal]

2007 INIST-CNRS ;ISSN: 0004-637X ;EISSN: 1538-4357 ;DOI: 10.1086/508798 ;CODEN: ASJOAB

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  • Title:
    Gravitational Lensing Model Degeneracies: Is Steepness All-Important?
  • Author: Saha, Prasenjit ; Williams, Liliya L. R
  • Subjects: Astronomy ; Earth, ocean, space ; Exact sciences and technology
  • Is Part Of: The Astrophysical journal, 2006-12, Vol.653 (2), p.936-941
  • Description: In gravitational lensing, steeper mass profiles generically produce longer time delays but smaller magnifications, without necessarily changing the image positions or magnification ratios between different images. This is well known. We find in this paper, however, that even if steepness is fixed, time delays can still have significant model dependence, which we attribute to shape-modeling degeneracies. This conclusion follows from numerical experiments with models of 35 galaxy lenses. We suggest that varying and twisting ellipticities, features that are explored by pixelated lens models but not, so far, by parametric models, has an important effect on time delays.
  • Publisher: Chicago, IL: IOP Publishing
  • Language: English
  • Identifier: ISSN: 0004-637X
    EISSN: 1538-4357
    DOI: 10.1086/508798
    CODEN: ASJOAB
  • Source: Alma/SFX Local Collection
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