Star formation and morphological trends in the Antlia cluster: Probing environmental influence out to 5R200

@misc{limadias2026star,
  title = {{Star formation and morphological trends in the Antlia cluster: Probing environmental influence out to 5R200}},
  author = {Ciria Lima-Dias and Antonela Monachesi and Gissel P. Montaguth and Rodrigo F. Haack and Daniela E. Olave-Rojas and Hugo Méndez-Hernández and Sergio Torres-Flores and Luis Otárola and Juan Pablo Calderón and Analía V. Smith Castelli and Yara L. Jaffé and Christopher P. Haines and Diego Pallero and Vitor M. Sampaio and Cristóbal Sifón and Alvaro Alvarez-Candal and María Argudo-Fernández and Simón Véliz Astudillo and Maiara S. Carvalho and Letizia P. Cassarà and Cheng Cheng and Arianna Cortesi and Ricardo Demarco and Alexis Finoguenov and Marcos Fonseca-Faria and Thiago S. Gonçalves and Eduardo Ibar and Iván Lacerna and Elismar Lösch and Angela C. Krabbe and Ulrike Kuchner and Erik V. R. Lima and Amanda R. Lopes and Vitor H. Lopes-Silva and Amrutha B. Manjunatha and Natanael M. Cardoso and Sebastián Ortiz-Gómez and Gustavo B. Oliveira Schwarz and Umberto Rescigno and Boudewijn F. Roukema and Nicolás Tejos and Eduardo Telles and Benedetta Vulcani and Stephane V. Werner and Laerte Sodré Jr and Fábio R. Herpich and Felipe Almeida-Fernandes and Antonio Kanaan and Tiago Ribeiro and William Schoenell and Claudia Mendes de Oliveira},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.23140},
  eprint = {2609.23140},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.23140},
}

TY  - UNPB
TI  - Star formation and morphological trends in the Antlia cluster: Probing environmental influence out to 5R200
AU  - Ciria Lima-Dias
AU  - Antonela Monachesi
AU  - Gissel P. Montaguth
AU  - Rodrigo F. Haack
AU  - Daniela E. Olave-Rojas
AU  - Hugo Méndez-Hernández
AU  - Sergio Torres-Flores
AU  - Luis Otárola
AU  - Juan Pablo Calderón
AU  - Analía V. Smith Castelli
AU  - Yara L. Jaffé
AU  - Christopher P. Haines
AU  - Diego Pallero
AU  - Vitor M. Sampaio
AU  - Cristóbal Sifón
AU  - Alvaro Alvarez-Candal
AU  - María Argudo-Fernández
AU  - Simón Véliz Astudillo
AU  - Maiara S. Carvalho
AU  - Letizia P. Cassarà
AU  - Cheng Cheng
AU  - Arianna Cortesi
AU  - Ricardo Demarco
AU  - Alexis Finoguenov
AU  - Marcos Fonseca-Faria
AU  - Thiago S. Gonçalves
AU  - Eduardo Ibar
AU  - Iván Lacerna
AU  - Elismar Lösch
AU  - Angela C. Krabbe
AU  - Ulrike Kuchner
AU  - Erik V. R. Lima
AU  - Amanda R. Lopes
AU  - Vitor H. Lopes-Silva
AU  - Amrutha B. Manjunatha
AU  - Natanael M. Cardoso
AU  - Sebastián Ortiz-Gómez
AU  - Gustavo B. Oliveira Schwarz
AU  - Umberto Rescigno
AU  - Boudewijn F. Roukema
AU  - Nicolás Tejos
AU  - Eduardo Telles
AU  - Benedetta Vulcani
AU  - Stephane V. Werner
AU  - Laerte Sodré Jr
AU  - Fábio R. Herpich
AU  - Felipe Almeida-Fernandes
AU  - Antonio Kanaan
AU  - Tiago Ribeiro
AU  - William Schoenell
AU  - Claudia Mendes de Oliveira
PY  - 2026
DA  - 2026/09/19
PB  - arXiv
DO  - 10.48550/arxiv.2609.23140
UR  - https://arxiv.org/abs/2609.23140
AB  - Galaxy evolution in dense environments such as clusters is strongly affected by environmental processes that can alter both morphology and star formation activity. We investigate these effects in the Antlia cluster out to 5R200 using Southern Photometric Local Universe Survey (S-PLUS) data. We derive H-alpha-based star formation rates from the J0660 band and Sersic indices with GALFITM. Our analysis focuses on 154 spectroscopically confirmed galaxies brighter than mr = 16. We classify galaxies as early- or late-type systems using colour and Sersic index, and as quenched or star-forming using specific star formation rate. We examine their dependence on clustercentric distance, projected phase-space, substructure, and local density. We find that star-forming galaxies dominate from 1 to 5R200, while quenched galaxies are more common within 1R200. Early- and late-type galaxies show similar radial trends, with comparable fractions within 1R200 and a higher late-type fraction at larger radii. Quenched galaxies dominate at log(Sigma10 [Mpc^-2]) >= 1.5, whereas late-type galaxies dominate at log(Sigma10 [Mpc^-2]) <= 1.0. We identify substructures extending from the cluster centre to the outskirts. Substructures outside the central region are dominated by star-forming and late-type galaxies, with fractions similar to those of galaxies not associated with detected substructures. However, when the massive central structure is included, the fraction of star-forming galaxies in substructures decreases, indicating a more environmentally processed population in the central region. Altogether, the presence of a massive central substructure together with additional substructures detected out to 5R200 indicates that Antlia is still undergoing mass assembly through group accretion, consistent with a dynamically active and young cluster that is still assembling its galaxy population.
ER  -