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

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

The Astrophysical Journal

Advertised on:
2
2020
Number of authors
13
IAC number of authors
1
Citations
10
Refereed citations
8
Description
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.
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Formation and Evolution of Galaxies: Observations in Infrared and other Wavelengths
This IAC research group carries out several extragalactic projects in different spectral ranges, using space as well as ground-based telescopes, to study the cosmological evolution of galaxies and the origin of nuclear activity in active galaxies. The group is a member of the international consortium which built the SPIRE instrument for the
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