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 journalArticlepeer-review


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, Mhalo, log(Mhalo/M) > 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(Mhalo/M) > 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
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 5 Feb 2020


  • astro-ph.GA


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