Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reducing and constraining the intrinsic galaxy alignment contamination
  to weak lensing measurements   We present a method for removal of the contaminating effects of intrinsic
galaxy alignments, in measurements of cosmic shear from multi-colour weak
lensing surveys. The method down-weights pairs which are likely to be close in
three dimensions, based on spectroscopic or photometric redshifts. Results are
dramatic: the intrinsic contamination of the low-redshift Sloan photometric
redshift survey could be 80 times the lensing signal, but this can be almost
completely removed, leaving random shot noise errors of the order of 10%.
Intrinsic galaxy alignments, although an annoying contaminant for cosmic shear
studies, are interesting in their own right, and we therefore present a new
observational constraint for their amplitude from the aperture mass B-mode in
the Red-Sequence Cluster Survey. The small measured B-mode rules out the
published intrinsic alignment models from numerical simulations, which assume
no evolution in galaxy clustering.

3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: nlin