TY - JOUR
T1 - Euclid Quick Data Release (Q1): XXXV. The role of cosmic connectivity in shaping galaxy clusters
AU - Euclid Collaboration
AU - Collaboration, Euclid
AU - Gouin, C.
AU - Laigle, C.
AU - Sarron, F.
AU - Bonnaire, T.
AU - Sorce, J. G.
AU - Aghanim, N.
AU - Magliocchetti, M.
AU - Quilley, L.
AU - Boldrini, P.
AU - Durret, F.
AU - Pichon, C.
AU - Kuchner, U.
AU - Malavasi, N.
AU - Kraljic, K.
AU - Gavazzi, R.
AU - Kang, Y.
AU - Stanford, S. A.
AU - Awad, P.
AU - Altieri, B.
AU - Amara, A.
AU - Andreon, S.
AU - Auricchio, N.
AU - Aussel, H.
AU - Baccigalupi, C.
AU - Baldi, M.
AU - Balestra, A.
AU - Bardelli, S.
AU - Basset, A.
AU - Battaglia, P.
AU - Bernardeau, F.
AU - Biviano, A.
AU - Bonchi, A.
AU - Branchini, E.
AU - Brescia, M.
AU - Brinchmann, J.
AU - Camera, S.
AU - Cañas-Herrera, G.
AU - Capobianco, V.
AU - Carbone, C.
AU - Carretero, J.
AU - Castellano, M.
AU - Castignani, G.
AU - Cavuoti, S.
AU - Chambers, K. C.
AU - Percival, W. J.
AU - Schewtschenko, J. A.
AU - Gaztanaga, E.
AU - Nadathur, S.
AU - Naidoo, K.
N1 - Paper submitted as part of the A&A Special Issue 'Euclid Quick Data Release (Q1)', 13 pages, 9 figures
PY - 2026/7/1
Y1 - 2026/7/1
N2 - The matter around galaxy clusters is distributed over several filaments, reflecting their positions as nodes in the large-scale cosmic web. The number of filaments connected to a cluster, i.e. its connectivity, is expected to affect the physical properties of clusters. Using the first Euclid galaxy catalogue from the Euclid Quick Release 1 (Q1), we investigated the connectivity of galaxy clusters and how it correlates with their physical and galaxy member properties. Around 220 clusters located within the three fields of Q1 (covering ∼63 deg2) were analysed in the redshift range 0.2 < z < 0.7. Due to the photometric redshift uncertainty, we reconstructed the cosmic web skeleton, and measured the cluster connectivity, in 2D projected slices with a thickness of 170 comoving h−1 Mpc and centred on each cluster redshift, by using two different filament finder algorithms on the most massive galaxies (M★ > 1010.3 M⊙). In agreement with previous measurements, we recovered the mass-connectivity relation independently of the filament detection algorithm, showing that the most massive clusters are, on average, connected to a larger number of cosmic filaments, consistent with hierarchical structure formation models. Furthermore, we explored the possible correlations between connectivities and two cluster properties: the fraction of early-type galaxies and the Sérsic index of galaxy members. Our result suggests that the clusters populated by early-type galaxies exhibit higher connectivity compared to clusters dominated by late-type galaxies. These preliminary investigations highlight our ability to quantify the impact of the cosmic web’s connectivity on cluster properties with Euclid.
AB - The matter around galaxy clusters is distributed over several filaments, reflecting their positions as nodes in the large-scale cosmic web. The number of filaments connected to a cluster, i.e. its connectivity, is expected to affect the physical properties of clusters. Using the first Euclid galaxy catalogue from the Euclid Quick Release 1 (Q1), we investigated the connectivity of galaxy clusters and how it correlates with their physical and galaxy member properties. Around 220 clusters located within the three fields of Q1 (covering ∼63 deg2) were analysed in the redshift range 0.2 < z < 0.7. Due to the photometric redshift uncertainty, we reconstructed the cosmic web skeleton, and measured the cluster connectivity, in 2D projected slices with a thickness of 170 comoving h−1 Mpc and centred on each cluster redshift, by using two different filament finder algorithms on the most massive galaxies (M★ > 1010.3 M⊙). In agreement with previous measurements, we recovered the mass-connectivity relation independently of the filament detection algorithm, showing that the most massive clusters are, on average, connected to a larger number of cosmic filaments, consistent with hierarchical structure formation models. Furthermore, we explored the possible correlations between connectivities and two cluster properties: the fraction of early-type galaxies and the Sérsic index of galaxy members. Our result suggests that the clusters populated by early-type galaxies exhibit higher connectivity compared to clusters dominated by late-type galaxies. These preliminary investigations highlight our ability to quantify the impact of the cosmic web’s connectivity on cluster properties with Euclid.
KW - astro-ph.CO
KW - methods: data analysis
KW - methods: observational
KW - methods: statistical
KW - galaxies: clusters: general
KW - large-scale structure of Universe
U2 - 10.1051/0004-6361/202554655
DO - 10.1051/0004-6361/202554655
M3 - Article
SN - 0004-6361
VL - 711
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A35
ER -