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arXiv 2312.09220astro-ph.GA
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冲压剥离候选体的诊断图

Diagnostic diagrams for ram-pressure stripped candidates

A. C. Krabbe, J. A. Hernandez-Jimenez, C. Mendes de Oliveira, Y. L. Jaffe, C. B. Oliveira, N. M. Cardoso, A. V. Smith Castelli, O. L. Dors, A. Cortesi, J. P. Crossett

AI总结:

本研究提出基于星系形态分析与诊断图筛选冲压剥离星系候选体的方法,在近邻星系群团中发现33个新候选体,为扩充相关星系样本提供了有效手段。

摘要:

本文提出一种通过对Legacy巡天获取的星系图像进行形态学分析,来寻找冲压剥离(ram-pressure stripped, RPS)星系候选体的方法。我们研究了约600个处于不同环境的星系样本,涵盖星系群与星系团、潮汐相互作用对星系以及场星系。该样本包含160个此前在文献中根据扰动程度递增被划分为J1至J5类的RPS星系。我们使用astromorphlib软件开展形态学分析,随后检视包含不对称性($A$)、集中度($C$)、Sérsic指数($n$)以及核球强度参数$F(G,\text{ }M_{20})$等不同参数组合的诊断图。\n我们发现其中部分诊断图呈现出一个独特区域,被划分为J3、J4和J5类的星系在该区域与孤立星系分离。我们将这一区域称为形态过渡区,同时还发现成对的潮汐相互作用星系在该区域中占主导地位。尽管如此,在对形态过渡区中的天体进行目视检查以排除明显的污染源后,我们最终在研究的近邻星系群与星系团(Hydra、Fornax和CLoGS样本)中得到了33个真实的新RPS候选体,其中三分之一展现出清晰的旋臂解旋证据。未来的研究可利用该方法大幅扩充已知RPS星系的样本规模。

英文摘要:

This paper presents a method for finding ram-pressure stripped (RPS) galaxy candidates by performing a morphological analysis of galaxy images obtained from the Legacy survey. We consider a sample of about 600 galaxies located in different environments such as groups and clusters, tidally interacting pairs and the field. The sample includes 160 RPS previously classified in the literature into classes from J1 to J5, based on the increasing level of disturbances. Our morphological analysis was done using the {\sc astromorphlib} software followed by the inspection of diagnostic diagrams involving combinations of different parameters like the asymmetry ($A$), concentration ($C$), Sérsic index ($n$), and bulge strength parameters $F(G,\,M_{20})$. We found that some of those diagrams display a distinct region in which galaxies classified as J3, J4 and J5 decouples from isolated galaxies. We call this region as the morphological transition zone and we also found that tidally interacting galaxies in pairs are predominant within this zone. Nevertheless, after visually inspecting the objects in the morphological transition zone to discard obvious contaminants, we ended up with 33 bonafide new RPS candidates in the studied nearby groups and clusters (Hydra, Fornax, and CLoGS sample), of which one-third show clear evidence of unwinding arms. Future works may potentially further increase significantly the samples of known RPS using such method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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