Clustering-based redshift estimation: application to VIPERS/CFHTLS

Abstract : We explore the accuracy of the clustering-based redshift estimation proposed by Menard et al. when applied to VIMOS Public Extragalactic Redshift Survey (VIPERS) and Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) real data. This method enables us to reconstruct redshift distributions from measurement of the angular clustering of objects using a set of secure spectroscopic redshifts. We use state-of-the-art spectroscopic measurements with i(AB) \textless 22.5 from the VIPERS as reference population to infer the redshift distribution of galaxies from the CFHTLS T0007 release. VIPERS provides a nearly representative sample to a flux limit of iAB \textless 22.5 at a redshift of \textgreater 0.5 which allows us to test the accuracy of the clustering-based redshift distributions. We show that this method enables us to reproduce the true mean colour-redshift relation when both populations have the same magnitude limit. We also show that this technique allows the inference of redshift distributions for a population fainter than the reference and we give an estimate of the colour-redshift mapping in this case. This last point is of great interest for future large-redshift surveys which require a complete faint spectroscopic sample.
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Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (2), pp.1683--1696. 〈10.1093/mnras/stw1500〉
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https://hal.archives-ouvertes.fr/hal-01440086
Contributeur : Christian Surace <>
Soumis le : jeudi 19 janvier 2017 - 00:37:08
Dernière modification le : samedi 25 novembre 2017 - 01:23:13

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L. A. M. Tasca, R. Tojeiro, D. Vergani, A. Zanichelli, J. Bel, et al.. Clustering-based redshift estimation: application to VIPERS/CFHTLS. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (2), pp.1683--1696. 〈10.1093/mnras/stw1500〉. 〈hal-01440086〉

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