The Role of Environment in Galaxy Evolution in the SERVS Survey. I. Density Maps and Cluster Candidates

Nick Krefting, Anna Sajina, Mark Lacy, Kristina Nyland, Duncan Farrah, Behnam Darvish, Steven Duivenvoorden, Ken Duncan, Violeta Gonzalez-Perez, Claudia Del P. Lagos, Seb Oliver, Raphael Shirley, Mattia Vaccari

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We use photometric redshifts derived from new u-band through 4.5 μm Spitzer IRAC photometry in the 4.8 deg2 of the XMM-LSS field to construct surface density maps in the redshift range of 0.1-1.5. Our density maps show evidence for large-scale structure in the form of filaments spanning several tens of megaparsecs. Using these maps, we identify 339 overdensities that our simulated light-cone analysis suggests are likely associated with dark matter halos with masses, M halo, log(M halo/M o˙) > 13.7. From this list of overdensities we recover 43 of 70 known X-ray-detected and spectroscopically confirmed clusters. The missing X-ray clusters are largely at lower redshifts and lower masses than our target log(M halo/M o˙) > 13.7. The bulk of the overdensities are compact, but a quarter show extended morphologies that include likely projection effects, clusters embedded in apparent filaments, and at least one potential cluster merger (at z ∼ 1.28). The strongest overdensity in our highest-redshift slice (at z ∼ 1.5) shows a compact red galaxy core, potentially implying a massive evolved cluster.

Original languageEnglish
Article number185
JournalThe Astrophysical Journal
Volume889
Issue number2
DOIs
Publication statusPublished - 1 Feb 2020

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