arXiv 2502.167512025-02-23astro-ph.GA

MAGPI巡天：红移$z\sim0.3$处的运动学形态-密度关系（或其缺失）与哈勃序列

The MAGPI Survey: the kinematic morphology-density relation (or lack thereof) and the Hubble sequence at $z\sim0.3$

Caroline Foster, Mark W. Donoghoe, Andrew Battisti, Francesco D'Eugenio, Katherine Harborne, Thomas Venville, Claudia Del P. Lagos, J. Trevor Mendel, Ryan Bagge… 展开作者

Caroline Foster, Mark W. Donoghoe, Andrew Battisti, Francesco D'Eugenio, Katherine Harborne, Thomas Venville, Claudia Del P. Lagos, J. Trevor Mendel, Ryan Bagge, Stefania Barsanti, Sabine Bellstedt, Alina Boecker, Qianhui Chen, Caro Derkenne, Anna Ferre-Matteu, Eda Gjergo, Anshu Gupta, Eric G. M. Muller, Giulia Santucci, Hye-Jin Park, Rhea-Silvia Remus, Sabine Thater, Jesse van de Sande, Sam Vaughan, Sarah Brough, Scott M. Croom, Lucas M. Valenzuela, Emily Wisnioski, the MAGPI Team

备注：: 23 pages, 19 figures, 3 tables, accepted for publication in PASA

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AI总结：

本研究基于MAGPI巡天的中等红移星系样本，通过扩展的Dawid-Skene贝叶斯模型开展形态与运动学分类，证实该红移下已存在各类形态及旋转/非旋转星系，但未发现运动学形态-密度关系，提出非旋转星系可能在进入致密环境前于小质量星系群中完成动力学预处理。

摘要：

本研究基于“积分场光谱研究中年星系性质”（Middle-Ages Galaxy Properties with Integral field spectroscopy, MAGPI）巡天，对637个空间分辨星系（其中大部分处于中等红移$z\sim0.3$）开展了视觉形态分类与动力学分类。每个星系至少获得了11份由具备相关知识的分类人员给出的独立视觉分类结果。我们对标准Dawid-Skene贝叶斯模型进行扩展，引入分类人员专属置信度参数与星系专属难度参数，以量化分类人员的置信水平并推断可靠的统计置信估计。我们选取了86个处于红移区间$0.2 \le z \le0.4$、亮度$r<20$星等、形态分类置信度>0.98的亮星系子样本，证实MAGPI巡天如设计预期涵盖了全部形态类型。类似地，通过82个高置信度亮星系的恒星运动学子样本，我们发现低红移下观测到的旋转与非旋转星系在中等红移时已存在。我们未发现$z\sim0$处观测到的运动学形态-密度关系在$z\sim0.3$时已建立的证据。我们提出，无明显恒星自转的星系在$z\sim0.3$之前的某个时期，于进入更致密环境前，在较低质量星系群中经历了动力学预处理。

英文摘要：

This work presents visual morphological and dynamical classifications for 637 spatially resolved galaxies, most of which are at intermediate redshift ($z\sim0.3$), in the Middle-Ages Galaxy Properties with Integral field spectroscopy (MAGPI) Survey. For each galaxy, we obtain a minimum of 11 independent visual classifications by knowledgeable classifiers. We use an extension of the standard Dawid-Skene bayesian model introducing classifier-specific confidence parameters and galaxy-specific difficulty parameters to quantify classifier confidence and infer reliable statistical confidence estimates. Selecting sub-samples of 86 bright ($r<20$ mag) high-confidence ($>0.98$) morphological classifications at redshifts ($0.2 \le z \le0.4$), we confirm the full range of morphological types is represented in MAGPI as intended in the survey design. Similarly, with a sub-sample of 82 bright high-confidence stellar kinematic classifications, we find that the rotating and non-rotating galaxies seen at low redshift are already in place at intermediate redshifts. We \textit{do not} find evidence that the kinematic morphology-density relation seen at $z\sim0$ is established at $z\sim0.3$. We suggest that galaxies without obvious stellar rotation are dynamically pre-processed sometime before $z\sim0.3$ within lower mass groups before joining denser environments.

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