Testing the Mass - SFR Structure of Galaxies around a Weak Lensing Selected Dark Matter Footprint in COSMOS Web

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ID: 323537
2026
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Abstract
Abstract We test whether a weak lensing selected DM region in COSMOS-Web is associated with measurable changes in the stellar mass - star formation rate distribution of galaxies. Using the HSC-SSP PDR3 mizuki catalogue, we construct a mass complete Subaru sample and compare the DM region with adjacent UP and DOWN controls matched in photometric redshift, stellar mass, and local projected density. We propagate photo-z uncertainties through Monte Carlo realisations, validate the curved ridge classification with mock catalogues and label shuffle tests, and use image derived weak lensing proxies only as a geometric/tomographic consistency check. An independent COSMOS2020 sample is analysed as a catalogue level consistency check within the available sky footprint of the DM region, rather than as a geometrical replication of the Subaru UP - DM - DOWN experiment. The baryonic density field shows its strongest spatial agreement with the JWST E-mode proxy near z ≃ 0.55 - 0.60, suggesting that the DM region is not an arbitrary aperture. This evidence is supportive rather than definitive because it is based on image derived proxies, not calibrated numerical convergence maps. In the controlled Subaru analysis, the matched DM, UP, and DOWN samples have nearly identical low SFR tail fractions, ftail ≃ 0.062, with no statistically meaningful DM region specific excess. COSMOS2020 gives the same qualitative result. Observed colour diagnostics show an ordered ridge - sub ridge - tail sequence, with the tail population reddest, but this red tail is not unique to the DM region. We conclude that the DM region is tomographically interesting, but the data do not support a robust DM region specific restructuring of the mass - SFR plane once redshift, stellar mass, local density, photo-z uncertainty, and classification effects are controlled.
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openalex_W7172346695 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors A Ediz, H A Dal
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1458
URL
https://doi.org/10.1093/mnras/stag1458
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