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arXiv 2501.06340astro-ph.GA
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利用机器学习通过结构参数和恒星形成参数进行星系形态分类

Morphological Classification of Galaxies Through Structural and Star Formation Parameters Using Machine Learning

G. Aguilar-Argüello, G. Fuentes-Pineda, H. M. Hernández-Toledo, L. A. Martínez-Vázquez, J. A. Vázquez-Mata, S. Brough, R. Demarco, A. Ghosh, Y. Jiménez-Teja, G.… 展开作者

G. Aguilar-Argüello, G. Fuentes-Pineda, H. M. Hernández-Toledo, L. A. Martínez-Vázquez, J. A. Vázquez-Mata, S. Brough, R. Demarco, A. Ghosh, Y. Jiménez-Teja, G. Martin, W. J. Pearson, C. Sifón

AI总结:

本文基于SDSS近邻星系的14项结构、颜色与不对称特征,使用XGBoost实现二分类和五分类形态识别,并通过分层方案与SHAP解释验证性能和特征影响。

摘要:

我们采用XGBoost机器学习(ML)方法,将星系形态分为两类(早型、晚型)和五类(E、S0–S0a、Sa–Sb、Sbc–Scd、Sd–Irr);所使用的特征组合包括非参数信息($C$、$A$、$S$、$A_S$、Gini、$M_{20}$、$c_{5090}$)、参数化信息(Sérsic指数$n$)、几何信息(轴比$BA$)、整体颜色($g-i$、$u-r$、$u-i$)、颜色梯度($Δ(g-i)$)和不对称度梯度($ΔA_{9050}$),这些量均针对由斯隆数字巡天(SDSS)成像数据汇编的近邻星系样本($z<0.15$)估算。我们训练XGBoost模型,并通过多种标准指标评估其性能。结果表明,使用全部十四个参数时性能更好,在二分类和五分类任务上分别达到88%和65%的准确率。此外,我们研究了五分类情形下的分层分类方法,组合三个XGBoost分类器,发现其性能与“直接”五分类相当,差异最高仅为3%。利用SHAP(一种先进的解释工具),我们分析星系参数如何影响模型分类,为这些特征对分类结果的影响提供有价值的见解。最后,我们将结果与以往研究比较,发现二者持续一致。

英文摘要:

We employ the XGBoost machine learning (ML) method for the morphological classification of galaxies into two (early-type, late-type) and five (E, S0--S0a, Sa--Sb, Sbc--Scd, Sd--Irr) classes, using a combination of non-parametric ($C,\,A,\,S,\,A_S,\,\mathrm{Gini},\,M_{20},\,c_{5090}$), parametric (Sérsic index, $n$), geometric (axial ratio, $BA$), global colour ($g-i,\,u-r,\,u-i$), colour gradient ($Δ(g - i)$), and asymmetry gradient ($ΔA_{9050}$) information, all estimated for a local galaxy sample ($z<0.15$) compiled from the Sloan Digital Sky Survey (SDSS) imaging data. We train the XGBoost model and evaluate its performance through multiple standard metrics. Our findings reveal better performance when utilizing all fourteen parameters, achieving accuracies of 88\% and 65\% for the two-class and five-class classification tasks, respectively. In addition, we investigate a hierarchical classification approach for the five-class scenario, combining three XGBoost classifiers. We observe comparable performance to the ``direct'' five-class classification, with discrepancies of only up to 3\%. Using SHAP (an advanced interpretation tool), we analyse how galaxy parameters impact the model's classifications, providing valuable insights into the influence of these features on classification outcomes. Finally, we compare our results with previous studies and find them consistently aligned.

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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