THE SWIFT AGN AND CLUSTER SURVEY. II. CLUSTER CONFIRMATION WITH SDSS DATA

被引：1

作者：

Griffin, Rhiannon D. ^{[1
]}

Dai, Xinyu ^{[1
]}

Kochanek, Christopher S. ^{[2
]}

Bregman, Joel N. ^{[3
]}

机构：

[1] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA

[2] Ohio State Univ, Dept Astron, 174 W 18Th Ave, Columbus, OH 43210 USA

[3] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2016年 / 222卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

catalogs; galaxies: clusters: general; galaxies: groups: general; large-scale structure of universe; surveys; DIGITAL SKY SURVEY; X-RAY-PROPERTIES; LARGE-SCALE STRUCTURE; POINT-SOURCE CATALOG; DEEP LENS SURVEY; GALAXY CLUSTERS; RED-SEQUENCE; LUMINOSITY FUNCTIONS; SQUARE DEGREES; DATA REDUCTION;

D O I：

10.3847/0067-0049/222/1/13

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study 203 (of 442) Swift AGN and Cluster Survey extended X-ray sources located in the SDSS DR8 footprint to search for galaxy over-densities in three-dimensional space using SDSS galaxy photometric redshifts and positions near the Swift cluster candidates. We find 104 Swift clusters with a >3 sigma galaxy over-density. The remaining targets are potentially located at higher redshifts and require deeper optical follow-up observations for confirmation as galaxy clusters. We present a series of cluster properties including the redshift, brightest cluster galaxy (BCG) magnitude, BCG-to-X-ray center offset, optical richness, and X-ray luminosity. We also detect red sequences in similar to 85% of the 104 confirmed clusters. The X-ray luminosity and optical richness for the SDSS confirmed Swift clusters are correlated and follow previously established relations. The distribution of the separations between the X-ray centroids and the most likely BCG is also consistent with expectation. We compare the observed redshift distribution of the sample with a theoretical model, and find that our sample is complete for z less than or similar to 0.3 and is still 80% complete up to z similar or equal to 0.4, consistent with the SDSS survey depth. These analysis results suggest that our Swift cluster selection algorithm has yielded a statistically well-defined cluster sample for further study of cluster evolution and cosmology. We also match our SDSS confirmed Swift clusters to existing cluster catalogs, and find 42, 23, and 1 matches in optical, X-ray, and Sunyaev-Zel'dovich catalogs, respectively, and so the majority of these clusters are new detections.

引用

页数：18

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