Extended Source Diffraction Effects near Gravitational Lens Fold Caustics | Zendy

S. A. Zabel | Zendy; J. B. Peterson | Zendy

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Extended Source Diffraction Effects near Gravitational Lens Fold Caustics

Author(s) -

S. A. Zabel,

J. B. Peterson

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/376896

Subject(s) - diffraction , gravitational lens , physics , caustic (mathematics) , optics , brightness , astrophysics , fold (higher order function) , galaxy , redshift , computer science , mathematical physics , programming language

Calculations are presented detailing the gravitational lens diffraction dueto the steep brightness gradient of the limb of a stellar source. The lensingcase studied is the fold caustic crossing. The limb diffraction signal greatlyexceeds that due to the disk as a whole and should be detectable for whitedwarf sources in our Galaxy and it's satellites with existing telescopes.Detection of this diffraction signal would provide an additional mathematicalconstraint, reducing the degeneracy among models of the lensing geometry. Thediffraction pattern provides pico-arcsecond resolution of the limb profile.Comment: 19 pages including 17 figures, Accepted for publication in ApJ, Minor conceptual change from previous versio

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