Dark Energy Survey Year 1 results: the effect of intracluster light on photometric redshifts for weak gravitational lensing

Gruen, D, Zhang, Y, Palmese, A, Yanny, B, Busti, V, Hoyle, B, Melchior, P, Miller, C J, Rozo, E, Rykoff, E S, Varga, T N, Abdalla, F B, Allam, S, Romer, K and DES Collaboration, (2019) Dark Energy Survey Year 1 results: the effect of intracluster light on photometric redshifts for weak gravitational lensing. Monthly Notices of the Royal Astronomical Society, 488 (3). pp. 4389-4399. ISSN 0035-8711

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Abstract

We study the effect of diffuse intracluster light on the critical surface mass density estimated from photometric redshifts of lensing source galaxies, and the resulting bias in a weak lensing measurement of galaxy cluster mass. Under conservative assumptions, we find the bias to be negligible for imaging surveys like the Dark Energy Survey with a recommended scale cut of ≥200kpc distance from cluster centres. For significantly deeper lensing source galaxy catalogues from present and future surveys like the Large Synoptic Survey Telescope program, more conservative scale and source magnitude cuts or a correction of the effect may be necessary to achieve percent level lensing measurement accuracy, especially at the massive end of the cluster population.

Item Type: Article
Keywords: gravitational lensing: weak–galaxies:clusters: general–galaxies: distances and redshifts–cosmology: observations.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Amelia Redman
Date Deposited: 15 Oct 2019 15:36
Last Modified: 15 Oct 2019 15:45
URI: http://sro.sussex.ac.uk/id/eprint/87180

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