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arXiv 2408.08353astro-ph.GA
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利用NewHorizon模拟研究星系群环境中星系恒星形成熄灭的起源

On the Origin of Star Formation Quenching of Galaxies in Group Environments using the NewHorizon simulation

Jinsu Rhee, Sukyoung K. Yi, Jongwan Ko, Emanuele Contini, J. K. Jang, Seyoung Jeon, San Han, Christophe Pichon, Yohan Dubois, Katarina Kraljic, Sébastien Peirani

AI总结:

本研究利用NewHorizon模拟分析低质量星系群内卫星星系的恒星形成熄灭现象,揭示不同质量星系的熄灭机制差异,挑战传统冲压气体剥离的环境效应认知。

摘要:

我们利用NewHorizon模拟,研究了两个低质量星系群(位力质量$M_{\rm vir}=10^{12.9}$和$10^{12.7}\\,M_{\odot}$)内恒星质量$M_{*} > 10^7\\,M_{\odot}$的卫星星系的恒星形成(SF)熄灭现象。我们证实,恒星质量$M_{*}\lesssim10^{10}\\,M_{\odot}$的卫星星系比场星系更易发生恒星形成熄灭,且熄灭比例随恒星质量增大而降低,这与近期研究结果一致。与星系团环境中的发现类似,我们注意到这些星系群内星系的轨道运动与恒星形成熄灭现象之间存在关联。具体而言,星系群中心区域的恒星形成受到抑制;对于恒星质量$M_{*} > 10^{9.1}\\,M_{\odot}$的星系,在经历短暂的熄灭期后通常会出现显著的恒星形成复新阶段。星系群中心的恒星形成熄灭主要由恒星形成效率与可用气体量的变化驱动,二者均受星系群内星际介质与周围热气体之间的流体动力学相互作用影响。与之相反,恒星质量$M_{*} < 10^{8.2}\\,M_{\odot}$的卫星星系在星系群内会经历显著的气体剥离,进而导致恒星形成熄灭。我们的分析凸显了星系群环境中卫星星系恒星形成熄灭的复杂性:它一方面取决于恒星形成效率(依赖于气体的动力学状态),另一方面与冷致密气体的可用量相关,二者之间存在复杂的竞争关系。这对基于 ram pressure(冲压)气体剥离的环境效应常规认知提出了挑战,表明需要建立温和环境效应下星系演化的新描述。

英文摘要:

We study star formation (SF) quenching of satellite galaxies with $M_{*} > 10^7\,M_{\odot}$ within two low-mass groups ($M_{\rm vir}=10^{12.9}$ and $10^{12.7} \,M_{\odot}$) using the NewHorizon simulation. We confirm that satellite galaxies ($M_{*}\lesssim10^{10}\,M_{\odot}$) are more prone to quenching than their field counterparts. This quenched fraction decreases with increasing stellar mass, consistent with recent studies. Similar to the findings in cluster environments, we note a correlation between the orbital motions of galaxies within these groups and the phenomenon of SF quenching. Specifically, SF is suppressed at the group center, and for galaxies with $M_{*} > 10^{9.1}\,M_{\odot}$, there is often a notable rejuvenation phase following a temporary quenching period. The SF quenching at the group center is primarily driven by changes in star formation efficiency and the amount of gas available, both of which are influenced by hydrodynamic interactions between the interstellar medium and surrounding hot gas within the group. Conversely, satellite galaxies with $M_{*} < 10^{8.2}\,M_{\odot}$ experience significant gas removal within the group, leading to SF quenching. Our analysis highlights the complexity of SF quenching in satellite galaxies in group environments, which involves an intricate competition between the efficiency of star formation (which depends on the dynamical state of the gas) on the one hand, and the availability of cold dense gas on the other hand. This challenges the typical understanding of environmental effects based on gas stripping through ram pressure, suggesting a need for a new description of galaxy evolution under mild environmental effects.

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