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On the shear estimation bias induced by the spatial variation of colour across galaxy profiles

Abstract:

The spatial variation of the colour of a galaxy may introduce a bias in the measurement of its shape if the PSF profile depends on wavelength. We study how this bias depends on the properties of the PSF and the galaxies themselves. The bias depends on the scales used to estimate the shape, which may be used to optimise methods to reduce the bias. Here we develop a general approach to quantify the bias. Although applicable to any weak lensing survey, we focus on the implications for the ESA Eu...

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Publication status:
Published

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Publisher copy:
10.1093/mnras/stt602

Authors


Journal:
Monthly Notices of the Royal Astronomical Society More from this journal
Volume:
432
Issue:
3
Pages:
2385-2401
Publication date:
2012-11-21
DOI:
EISSN:
1365-2966
ISSN:
0035-8711
Language:
English
Keywords:
Pubs id:
pubs:364017
UUID:
uuid:1b238d37-db5e-478e-976d-10aadd03f44d
Local pid:
pubs:364017
Source identifiers:
364017
Deposit date:
2013-11-16

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