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Cited by 302

The DOI matches its Crossref record; 62 of the 62 references it cites were found in a registry or an index.

CFHTLenS: improving the quality of photometric redshifts with precision photometry★: CFHTLenS: photometric redshifts

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Hildebrandt, H., Erben, T., Kuijken, K., van Waerbeke, L., Heymans, C., Coupon, J., Benjamin, J., Bonnett, C., Fu, L., Hoekstra, H., Kitching, T. D., Mellier, Y., Miller, L., Velander, M., Hudson, M. J., Rowe, B. T. P., Schrabback, T., Semboloni, E., Benítez, N.·2012·Monthly Notices of the Royal Astronomical Society
DOI 10.1111/j.1365-2966.2012.20468.x
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Abstract

Here we present the results of various approaches to measure accurate colours and photometric redshifts (photo-z's) from wide-field imaging data. We use data from the Canada-France-Hawaii-Telescope Legacy Survey (CFHTLS) which have been re- processed by the CFHT Lensing Survey (CFHTLenS) team in order to carry out a number of weak gravitational lensing studies. An emphasis is put on the correction of systematic effects in the photo-z's arising from the different Point Spread Functions (PSF) in the five optical bands. Different ways of correcting these effects are discussed and the resulting photo-z accuracies are quantified by comparing the photo-z's to large spectroscopic redshift (spec-z) data sets. Careful homogenisation of the PSF between bands leads to increased overall accuracy of photo-z's. The gain is particularly pronounced at fainter magnitudes where galaxies are smaller and flux measurements are affected more by PSF-effects. We also study possible re- calibrations of the photometric zeropoints (ZPs) with the help of galaxies with known spec-z's. We find that if PSF-effects are properly taken into account, a re-calibration of the ZPs becomes much less important suggesting that previous such re-calibrations described in the literature could in fact be mostly corrections for PSF-effects rather than corrections for real inaccuracies in the ZPs. The implications of this finding for future surveys like KiDS, DES, LSST, or Euclid are mixed. On the one hand, ZP re-calibrations with spec-z's might not be as accurate as previously thought. On the other hand, careful PSF homogenisation might provide a way out and yield accurate, homogeneous photometry without the need for full spectroscopic coverage. This is the first paper in a series describing the technical aspects of CFHTLenS. (abridged)

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Metadata

Authors
Hildebrandt, H., Erben, T., Kuijken, K., van Waerbeke, L., Heymans, C., Coupon, J., Benjamin, J., Bonnett, C., Fu, L., Hoekstra, H., Kitching, T. D., Mellier, Y., Miller, L., Velander, M., Hudson, M. J., Rowe, B. T. P., Schrabback, T., Semboloni, E., & Benítez, N.
Venue
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Published
2012-02-09
Volume
421
Issue
3
Pages
2355-2367
ISSN
0035-8711 (ISSN-L)
DOI
10.1111/j.1365-2966.2012.20468.x
OpenAlex
W1922909567
Cited by
302
References
62
FWCI
16.48
Type
journal article
Language
en
Open access
green

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Hildebrandt, H., Erben, T., Kuijken, K., van Waerbeke, L., Heymans, C., Coupon, J., Benjamin, J., Bonnett, C., Fu, L., Hoekstra, H., Kitching, T. D., Mellier, Y., Miller, L., Velander, M., Hudson, M. J., Rowe, B. T. P., Schrabback, T., Semboloni, E., & Benítez, N. (2012). CFHTLenS: improving the quality of photometric redshifts with precision photometry★: CFHTLenS: photometric redshifts. Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1111/j.1365-2966.2012.20468.x

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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