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Published February 1, 2020 | Accepted Version + Published
Journal Article Open

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

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_⊙) > 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_⊙) > 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.

Additional Information

© 2020. The American Astronomical Society. Received 2019 June 19; revised 2019 November 8; accepted 2019 November 18; published 2020 February 5. The authors acknowledge useful discussions with Rachel Bezanson, Frank van den Bosch, and Eric Gawiser that helped guide our analysis. The authors especially thank Ryan Cybulski for providing his Voronoi Tesselation idl code, which N.K. translated into python and has used for this project. B.D. acknowledges financial support from the National Science Foundation, grant No. 1716907.

Attached Files

Published - Krefting_2020_ApJ_889_185.pdf

Accepted Version - 1912.02238.pdf

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Additional details

Created:
August 22, 2023
Modified:
October 19, 2023