Searching for galaxy clusters in the Kilo-Degree Survey

被引：33

作者：

Radovich, M. ^{[1
]}

Puddu, E. ^{[2
]}

Bellagamba, F. ^{[3
,4
]}

Roncarelli, M. ^{[3
,4
]}

Moscardini, L. ^{[3
,4
,5
]}

Bardelli, S. ^{[4
]}

Grado, A. ^{[2
]}

Getman, F. ^{[2
]}

Maturi, M. ^{[6
]}

Huang, Z. ^{[2
]}

Napolitano, N. ^{[2
]}

McFarland, J. ^{[7
]}

Valentijn, E. ^{[7
]}

Bilicki, M. ^{[8
]}

机构：

[1] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[2] INAF Osservatorio Astron Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy

[3] Univ Bologna, Alma Mater Studiorum, Dipartimento Fis & Astron, Viale Berti Pichat 6-2, I-40127 Bologna, Italy

[4] INAF Osservatorio Astron Bologna, Via Ranzani 1, I-40127 Bologna, Italy

[5] INFN Sez Bologna, Viale Berti Pichat 6-2, I-40127 Bologna, Italy

[6] Heidelberg Univ, Zentrum Astron, Philosophenweg 12, D-69120 Heidelberg, Germany

[7] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[8] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 598卷

基金：

欧洲研究理事会;

关键词：

galaxies clusters general; galaxies distances and redshifts; DIGITAL SKY SURVEY; X-RAY; REDSHIFT SURVEY; RICH CLUSTERS; MASS; CATALOG; FILTER; DISTRIBUTIONS; CONSTRAINTS; ALGORITHM;

D O I：

10.1051/0004-6361/201629353

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. In this paper, we present the tools used to search for galaxy clusters in the Kilo Degree Survey (KiDS), and our first results. Methods. The cluster detection is based on an implementation of the optimal filtering technique that enables us to identify clusters as over-densities in the distribution of galaxies using their positions on the sky, magnitudes, and photometric redshifts. The contam-ination and completeness of the cluster catalog are derived using mock catalogs based on the data themselves. The optimal signal to noise threshold for the cluster detection is obtained by randomizing the galaxy positions and selecting the value that produces a contamination of less than 20%. Starting from a subset of clusters detected with high significance at low redshifts, we shift them to higher redshifts to estimate the completeness as a function of redshift: the average completeness is similar to 85%. An estimate of the mass of the clusters is derived using the richness as a proxy. Results. We obtained 1858 candidate clusters with redshift 0 < z(c) < 0.7 and mass 10(13.5) < M-500 < 10(15) M-circle dot in an area of 114 sq. degrees (KiDS ESO-DR2). A comparison with publicly available Sloan Digital Sky Survey (SDSS)-based cluster catalogs shows that we match more than 50% of the clusters (77% in the case of the redMaPPer catalog). We also cross-matched our cluster catalog with the Abell clusters, and clusters found by XMM and in the Planck-SZ survey; however, only a small number of them lie inside the KiDS area currently available.

引用

页数：12

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