Cluster connectivity in DES Y3 data: impact on galaxy properties

@misc{gouin2026cluster,
  title = {{Cluster connectivity in DES Y3 data: impact on galaxy properties}},
  author = {C. Gouin and C. Laigle and J. Prat and L. O. V. Edwards and P. Ganeshaiah Veena and D. Galárraga-Espinosa and G. Gopidas},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.31800},
  eprint = {2610.31800},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.31800},
}

TY  - UNPB
TI  - Cluster connectivity in DES Y3 data: impact on galaxy properties
AU  - C. Gouin
AU  - C. Laigle
AU  - J. Prat
AU  - L. O. V. Edwards
AU  - P. Ganeshaiah Veena
AU  - D. Galárraga-Espinosa
AU  - G. Gopidas
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2610.31800
UR  - https://arxiv.org/abs/2610.31800
AB  - Connectivity, namely the number of cosmic filaments reaching out of groups or clusters, has recently emerged as an informative way to quantify environment. With the advent of wide-area photometric surveys, it becomes possible to measure connectivity on a statistically significant sample of clusters. In this work, we extract the cosmic web from the DES Y3 photometric data and measure the connectivity around clusters from several public catalogs up to z < 1. Cosmic filaments are extracted in 2D with DisPerSE (the parametrization of which is calibrated on simulations) in tomographic slices of fixed comoving thickness of 220 Mpc, with a constant sampling across the redshift range (∼ 0.1 galaxies Mpc^−2). We first recover the well-established trend that cluster connectivity increases with cluster mass at all redshifts. We then investigate the properties of cluster member galaxies and find that, at fixed mass, clusters with a higher fraction of red (elliptical) galaxies are more strongly connected to the cosmic web. Furthermore, by examining the radial profiles of the red and elliptical galaxy fractions, we obtain hints that galaxy populations may undergo pre-processing within filamentary structures before being accreted into clusters. Overall, we demonstrate that despite photometric redshift uncertainties and projection effects, our method allows for the quantification of the cosmic web environment around clusters in broad-band photometric surveys. This work is consistent with results based on the Euclid Quick Release 1 (Q1). We plan to publicly release the cluster connectivity catalog as well as the cosmic filament catalog.
ER  -