Euclid: Quick Data Release (Q1) -- Exploring the detailed visual morphology of galaxies in clusters

@misc{masbuitrago2026euclid,
  title = {{Euclid: Quick Data Release (Q1) -- Exploring the detailed visual morphology of galaxies in clusters}},
  author = {P Mas-Buitrago and S Kruk and D O'Ryan and M.T Nardone and A La Marca and P Awad and M Baes and M Fossati and T Géron and Z Ghaffari and M Girardi and C.J Lintott and J G Sorce and B Altieri and F Durret and V Pettorino and B.Y Irureta-Goyena and B Simmons and J Reerink and H. Domínguez Sánchez and J.H Knapen and F Shankar and E Duran-Camacho and J.M Pérez-Martínez and M Walmsley and N Auricchio and C Baccigalupi and M Baldi and S Bardelli and P Battaglia and A Biviano and M Bolzonella and A Bonchi and E Branchini and M Brescia and J Brinchmann and S Camera and G Cañas-Herrera and V Capobianco and C Carbone and J Carretero and M Castellano and G Castignani and S Cavuoti and A Cimatti and C Colodro-Conde and G Congedo and C.J Conselice and L Conversi and Y Copin and A Costille and F Courbin and H.M Courtois and M Cropper and H Degaudenzi and G de Lucia and Herve Dole and F Dubath and X Dupac and S Dusini},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.08962},
  eprint = {2609.08962},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05759066v1},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Euclid: Quick Data Release (Q1) -- Exploring the detailed visual morphology of galaxies in clusters
AU  - P Mas-Buitrago
AU  - S Kruk
AU  - D O'Ryan
AU  - M.T Nardone
AU  - A La Marca
AU  - P Awad
AU  - M Baes
AU  - M Fossati
AU  - T Géron
AU  - Z Ghaffari
AU  - M Girardi
AU  - C.J Lintott
AU  - J G Sorce
AU  - B Altieri
AU  - F Durret
AU  - V Pettorino
AU  - B.Y Irureta-Goyena
AU  - B Simmons
AU  - J Reerink
AU  - H. Domínguez Sánchez
AU  - J.H Knapen
AU  - F Shankar
AU  - E Duran-Camacho
AU  - J.M Pérez-Martínez
AU  - M Walmsley
AU  - N Auricchio
AU  - C Baccigalupi
AU  - M Baldi
AU  - S Bardelli
AU  - P Battaglia
AU  - A Biviano
AU  - M Bolzonella
AU  - A Bonchi
AU  - E Branchini
AU  - M Brescia
AU  - J Brinchmann
AU  - S Camera
AU  - G Cañas-Herrera
AU  - V Capobianco
AU  - C Carbone
AU  - J Carretero
AU  - M Castellano
AU  - G Castignani
AU  - S Cavuoti
AU  - A Cimatti
AU  - C Colodro-Conde
AU  - G Congedo
AU  - C.J Conselice
AU  - L Conversi
AU  - Y Copin
AU  - A Costille
AU  - F Courbin
AU  - H.M Courtois
AU  - M Cropper
AU  - H Degaudenzi
AU  - G de Lucia
AU  - Herve Dole
AU  - F Dubath
AU  - X Dupac
AU  - S Dusini
PY  - 2026
DA  - 2026/09/08
PB  - HAL
DO  - 10.48550/arxiv.2609.08962
UR  - https://hal.science/hal-05759066v1
AB  - Galaxy clusters provide unique laboratories for studying environmental effects on galaxy evolution. The morphology--density (T--Σ) and morphology--cluster-centric radius (T--R) relations trace how galaxy morphology is influenced by the environment, but previous studies at intermediate redshifts have been limited in both sample size and radial coverage. We use the Euclid Quick Data Release 1 (Q1) visual morphology catalogue to measure the T--Σ and T--R relations for smooth, featured-or-disc, and barred galaxies in known clusters at 0.2≤ z≤ 0.5, extending this analysis to large cluster-centric distances (3 R_500c) and studying their dependence on stellar mass. Using photometric redshifts and stellar masses provided by Euclid, we identify 1754 cluster members within 1.5 R_500c, distributed across 71 clusters. We classify the identified galaxies as smooth, featured-or-disc, or barred using the predicted vote fractions provided by the Zoobot deep learning foundation model in the Q1 visual morphology catalogue. We confirm the T--Σ relation in all the stellar mass ranges studied, with a stronger influence of the cluster environment on galaxy morphology in the densest parts of the cluster and closer to the cluster centre. Beyond 1.5 R_500c, the morphological segregation weakens, with featured-or-disc galaxies overtaking smooth galaxies at the lowest densities, consistent with the growing contribution of field interlopers in the cluster outskirts. For barred galaxies, we find a tentative decline of the bar fraction toward lower densities that is most pronounced for the most massive galaxies. In conclusion, our results show that the cluster environment drives a progressive transformation of galaxy morphology, with the loss of disc structure becoming more pronounced towards the cluster core, where environmental processes act most efficiently.
ER  -