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Title:
Calibration of colour gradient bias in shear measurement using HST/CANDELS data
Authors:
Er, X.; Hoekstra, H.; Schrabback, T.; Cardone, V. F.; Scaramella, R.; Maoli, R.; Vicinanza, M.; Gillis, B.; Rhodes, J.
Affiliation:
AA(INAF -- Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monte Porzio Catone, Roma, Italy; South-Western Institute for Astronomy Research, Yunnan University, 650091 Kunming, China 0000-0002-8700-3671), AB(Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands 0000-0002-0641-3231), AC(Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn, Germany), AD(INAF -- Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monte Porzio Catone, Roma, Italy), AE(INAF -- Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monte Porzio Catone, Roma, Italy; INFN -- Universit di Roma "La Sapienza", Piazzale Aldo Moro 2, 00185 Roma, Italy), AF(INFN -- Universit di Roma "La Sapienza", Piazzale Aldo Moro 2, 00185 Roma, Italy; Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro, I-00185 Roma, Italy), AG(INAF -- Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monte Porzio Catone, Roma, Italy; Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro, I-00185 Roma, Italy; Dipartimento di Fisica, Università di Roma "Tor Vergata", via della Ricerca Scientifica 1, I-00133 Roma, Italy; Instituto de Astrofísica e Ciências do Espaco, Universidade de Lisboa, Faculdade de Ciências, Campo Grande, PT1749-016 Lisbon, Portugal), AH(INFN -- Universit di Roma "La Sapienza", Piazzale Aldo Moro 2, 00185 Roma, Italy 0000-0002-4478-1270), AI(Royal Observatory, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 4, p.5645-5657 (MNRAS Homepage)
Publication Date:
06/2018
Origin:
OUP
Astronomy Keywords:
gravitational lensing: weak, methods: data analysis
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty685
Bibliographic Code:
2018MNRAS.476.5645E

Abstract

Accurate shape measurements are essential to infer cosmological parameters from large area weak gravitational lensing studies. The compact diffraction-limited point spread function (PSF) in space-based observations is greatly beneficial, but its chromaticity for a broad-band observation can lead to new subtle effects that could hitherto be ignored: the PSF of a galaxy is no longer uniquely defined and spatial variations in the colours of galaxies result in biases in the inferred lensing signal. Taking Euclid as a reference, we show that this colour gradient bias (CG bias) can be quantified with high accuracy using available multicolour Hubble Space Telescope (HST) data. In particular we study how noise in the HST observations might impact such measurements and find this to be negligible. We determine the CG bias using HST observations in the F606W and F814W filters and observe a correlation with the colour, in line with expectations, whereas the dependence with redshift is weak. The biases for individual galaxies are generally well below 1 per cent, which may be reduced further using morphological information from the Euclid data. Our results demonstrate that CG bias should not be ignored, but it is possible to determine its amplitude with sufficient precision, so that it will not significantly bias the weak lensing measurements using Euclid data.
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