The role of environment in galaxy evolution in the servs survey. I. density maps and cluster candidates
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Date
2020Author
Vaccari, Mattia
Krefting, Nick
Sajina, Anna
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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.