The role of environment in galaxy evolution in the servs survey. I. density maps and cluster candidates
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
The American Astronomical Society
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, Mhalo, log(Mhalo/Me) > 13.7. From this list of overdensities we recover 43 of 70 known X-raydetected and spectroscopically confirmed clusters. The missing X-ray clusters are largely at lower redshifts and
lower masses than our target log(Mhalo/Me) > 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.
Description
Keywords
Density maps, Redshift surveys, Galaxy clusters, Large-scale structure of the universe, Galaxy cluster counts
Citation
Vaccari, M. et al. (2020). The role of environment in galaxy evolution in the servs survey. I. density maps and cluster candidates. The Astrophysical Journal, 889(2), 185