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arXiv 2609.23140astro-ph.GA

Antlia星系团中的恒星形成与形态演化趋势:探测至5R200的环境影响

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

Ciria Lima-Dias, Antonela Monachesi, Gissel P. Montaguth, Rodrigo F. Haack, Daniela E. Olave-Rojas, Hugo Méndez-Hernández, Sergio Torres-Flores, Luis Otárola, J… 展开作者

Ciria Lima-Dias, Antonela Monachesi, Gissel P. Montaguth, Rodrigo F. Haack, Daniela E. Olave-Rojas, Hugo Méndez-Hernández, Sergio Torres-Flores, Luis Otárola, Juan Pablo Calderón, Analía V. Smith Castelli, Yara L. Jaffé, Christopher P. Haines, Diego Pallero, Vitor M. Sampaio, Cristóbal Sifón, Alvaro Alvarez-Candal, María Argudo-Fernández, Simón Véliz Astudillo, Maiara S. Carvalho, Letizia P. Cassarà, Cheng Cheng, Arianna Cortesi, Ricardo Demarco, Alexis Finoguenov, Marcos Fonseca-Faria, Thiago S. Gonçalves, Eduardo Ibar, Iván Lacerna, Elismar Lösch, Angela C. Krabbe, Ulrike Kuchner, Erik V. R. Lima, Amanda R. Lopes, Vitor H. Lopes-Silva, Amrutha B. Manjunatha, Natanael M. Cardoso, Sebastián Ortiz-Gómez, Gustavo B. Oliveira Schwarz, Umberto Rescigno, Boudewijn F. Roukema, Nicolás Tejos, Eduardo Telles, Benedetta Vulcani, Stephane V. Werner, Laerte Sodré, Fábio R. Herpich, Felipe Almeida-Fernandes, Antonio Kanaan, Tiago Ribeiro, William Schoenell, Claudia Mendes de Oliveira

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中文总结 AI 辅助

利用S-PLUS数据研究Antlia星系团至5R200的环境影响,发现恒星形成星系在外围占优、熄灭星系在中心占优,并探测到子结构,表明该星系团仍处于活跃的质量聚集阶段。

中文摘要 AI 辅助

星系在星系团等致密环境中的演化受到环境过程的强烈影响,这些过程可以改变星系的形态和恒星形成活动。我们利用南方光度巡天(S-PLUS)数据,研究了Antlia星系团直至5R200范围内的这些效应。我们从J0660波段推导了基于Hα的恒星形成率,并使用GALFITM获得了Sersic指数。我们的分析聚焦于154个光谱确认的、亮度亮于mr=16的星系。我们利用颜色和Sersic指数将星系分类为早型或晚型系统,并利用比恒星形成率将其分类为熄灭星系或恒星形成星系。我们检验了这些分类对星系团中心距离、投影相空间、子结构和局部密度的依赖性。我们发现,恒星形成星系在1至5R200范围内占主导,而熄灭星系在1R200以内更为常见。早型和晚型星系表现出相似的径向趋势,在1R200以内比例相当,而在更大半径处晚型星系比例更高。熄灭星系在log(Sigma10 [Mpc^-2]) >= 1.5时占主导,而晚型星系在log(Sigma10 [Mpc^-2]) <= 1.0时占主导。我们识别出从星系团中心延伸至外围的子结构。中心区域以外的子结构由恒星形成星系和晚型星系主导,其比例与未关联到探测子结构的星系相似。然而,当包含质量巨大的中心子结构时,子结构中恒星形成星系的比例下降,表明中心区域存在一个受环境作用更强的星系群体。总体而言,一个质量巨大的中心子结构以及探测至5R200的额外子结构的存在表明,Antlia星系团仍在通过星系群吸积进行质量聚集,这与一个动力学活跃且年轻的星系团仍在组装其星系群体的图景一致。

英文摘要

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.

发表机构

  • Universidad de La Serena(拉塞雷纳大学)
  • Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo(圣保罗大学天文、地球物理与大气科学研究所)
  • Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata(拉普拉塔国立大学天文与地球物理科学学院)
  • Universidad de Talca(塔尔卡大学)
  • Millennium Nucleus for Galaxies (MINGAL)(银河系千年核心(MINGAL))
  • Instituto de Astrofísica de La Plata, CONICET-UNLP(拉普拉塔天体物理研究所,阿根廷国家科学研究委员会-拉普拉塔国立大学)

机构由 AI 辅助整理,请以论文原文为准。

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