Beware the Nonuniqueness of Einstein Rings | Zendy

Prasenjit Saha | Zendy; Liliya L. R. Williams | Zendy

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Beware the Nonuniqueness of Einstein Rings

Author(s) -

Prasenjit Saha,

Liliya L. R. Williams

Publication year - 2001

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 - 10.1086/321151

Subject(s) - einstein ring , qsos , galaxy , einstein , simple (philosophy) , plot (graphics) , ring (chemistry) , physics , graphics , lens (geology) , contour line , astrophysics , computer graphics (images) , gravitational lens , computer science , mathematics , mathematical physics , optics , philosophy , quasar , redshift , statistics , chemistry , epistemology , organic chemistry , meteorology

We explain how an approximation to the rings formed by the host galaxies inlensed QSOs can be inferred from the QSO data alone. A simple ring image can bemade from any lens model by a simple piece of computer graphics: just plot acontour map of the arrival-time surface with closely-spaced contours. We go onto explain that rings should be (a) sensitive to time-delay ratios betweendifferent pairs of images, but (b) very insensitive to H_0. We illustrate thisfor the well-known quads 1115+080 and 1608+656.Comment: To appear in AJ (circa Aug 2001

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