期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 414, 期 3, 页码 1840-1850出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18332.x
关键词
gravitational lensing: weak; galaxies: clusters: individual: Abell 370; galaxies: clusters: individual: RX J1347.5-1145; galaxies: clusters: individual: ZwCl 0024.0+1652; cosmology: observations
资金
- Israel Science Foundation [214/02]
- National Science Council of Taiwan [NSC97-2112-M-001-020-MY3]
The amplitude of weak lensing should increase with source distance, rising steeply behind a lens and saturating at high redshift, providing a model-independent means of measuring cosmic geometry. We measure the amplitude of weak lensing with redshift for three massive clusters, A370 (z = 0.375), ZwCl0024 + 17 ( z = 0.395) and RXJ1347-11 ( z = 0.451), using deep, three-colour Subaru imaging. We define the depth of lensed populations with reference to the COSMOS and GOODS fields, providing a consistency check of photo-z estimates over a wide range of redshift and magnitude. The predicted distance-redshift relation is followed well for the deepest data set, A370, for a wide range of cosmologies, and is consistent with less accurate data for the other two clusters. Scaling this result to a new survey of similar to 25 massive clusters should provide a useful cosmological constraint on w, complementing existing techniques, with distance measurements covering the untested redshift range, 1 < z < 5.
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