The WaZP galaxy cluster sample of the dark energy survey year 1

Aguena, M. and Benoist, C and Desai, Shantanu and et al, . (2021) The WaZP galaxy cluster sample of the dark energy survey year 1. Monthly Notices of the Royal Astronomical Society, 502 (3). ISSN 0035-8711

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Abstract

We present a new (2+1)D galaxy cluster finder based on photometric redshifts called Wavelet Z Photometric (WaZP) applied to DES first year (Y1A1) data. The results are compared to clusters detected by the South Pole Telescope (SPT) survey and the redMaPPer cluster finder, the latter based on the same photometric data. WaZP searches for clusters in wavelet-based density maps of galaxies selected in photometric redshift space without any assumption on the cluster galaxy populations. The comparison to other cluster samples was performed with a matching algorithm based on angular proximity and redshift difference of the clusters. It led to the development of a new approach to match two optical cluster samples, following an iterative approach to minimize incorrect associations. The WaZP cluster finder applied to DES Y1A1 galaxy survey (1511.13 deg2 up to mi = 23 mag) led to the detection of 60 547 galaxy clusters with redshifts 0.05 < z < 0.9 and richness Ngals ≥ 5. Considering the overlapping regions and redshift ranges between the DES Y1A1 and SPT cluster surveys, all sz based SPT clusters are recovered by the WaZP sample. The comparison between WaZP and redMaPPer cluster samples showed an excellent overall agreement for clusters with richness Ngals (λ for redMaPPer) greater than 25 (20), with 95 per cent recovery on both directions. Based on the cluster cross-match, we explore the relative fragmentation of the two cluster samples and investigate the possible signatures of unmatched clusters. © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.

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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Additional Information:

This research was funded by the Department of Civil, Construction, and Environmental Engineering and National Concrete Pavement Technology Center (CP Tech Center) at Iowa State University. Thanks are due to Richard Meininger at Turner Fairbank Highway Research Center with assistance building our abrasion device. The aggregate was supplied by Hallett Materials, and the cement by La-Farge. The admixtures were supplied by BASF, and the fibers by Propex. The BEAN soybean oil was provided by Jim Miller of C2 Products. Xypex C-1000 and Gamma Cure products were supplied the Xypex Chemical Corporation and Carroll Distributing. Laboratory work was assisted by undergraduate students Jeff Bogaards and David Grandfield. The opinions, findings, and conclusions presented here are those of the authors and do not necessarily reflect those of the research sponsors.

Uncontrolled Keywords:

galaxies: clusters: general; galaxies: distances and redshifts; methods: data analysis; surveys

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

04 Oct 2022 12:40

Last Modified:

04 Oct 2022 12:40