Mapping the dark matter with weak gravitational lensing
Mapping the dark matter with weak gravitational lensing
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DOI:
10.1086/172297
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发表时间:
1993-02
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影响因子:
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通讯作者:
N. Kaiser;G. Squires
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文献类型:
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作者:
N. Kaiser;G. Squires
We consider the problem of reconstructing the projected mass distribution in clusters from coherent distortions of background galaxies. The ellipticity of a background galaxy provides an estimate of the trace-free components of the tidal field ∂ 2 Φ/∂θ y ∂θ j where Φ(θ) is the two-dimensional potential generated by the surface density Σ(θ). We present a technique for inverting this problem. The resulting surface density contains a strong, but incoherent, random component arising from the random intrinsic galaxy ellipticities. This can be removed by filtering