Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cluster mass reconstruction from weak gravitational lensing   Kaiser & Squires have proposed a technique for mapping the dark matter in
galaxy clusters using the coherent weak distortion of background galaxy images
caused by gravitational lensing. We investigate the effectiveness of this
technique under controlled conditions by creating simulated CCD frames
containing galaxies lensed by a model cluster, measuring the resulting galaxy
shapes, and comparing the reconstructed mass distribution with the original.
Typically, the reconstructed surface density is diminished in magnitude when
compared to the original. The main cause of this reduced signal is the blurring
of galaxy images by atmospheric seeing, but the overall factor by which the
reconstructed surface density is reduced depends also on the signal-to-noise
ratio in the CCD frame and on both the sizes of galaxy images and the magnitude
limit of the sample that is analysed. We propose a method for estimating a
multiplicative compensation factor. We test our technique using a lensing
cluster drawn from a cosmological N-body simulation with a variety of realistic
background galaxy populations and observing conditions. We find that typically
the compensation factor is appreciable, 1.4<f<2.2, and varies considerably
depending on the observing conditions and sample selection. Our method yields a
compensation factor which when used to correct the surface density estimates
produces values that are in good agreement with those of the original cluster.
Thus weak lensing observations when calibrated using this method yield not only
accurate maps of the cluster morphology but also quantitative estimates of the
cluster mass distribution.

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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas