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arXiv 2203.08862astro-ph.GA
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中等红移星系团中心的星暴后星系

Post-starburst galaxies in the centers of intermediate redshift clusters

Ariel Werle, Bianca Poggianti, Alessia Moretti, Callum Bellhouse, Benedetta Vulcani, Marco Gullieuszik, Mario Radovich, Jacopo Fritz, Alessandro Ignesti, Johan … 展开作者

Ariel Werle, Bianca Poggianti, Alessia Moretti, Callum Bellhouse, Benedetta Vulcani, Marco Gullieuszik, Mario Radovich, Jacopo Fritz, Alessandro Ignesti, Johan Richard, Geneviève Soucail, Gustavo Bruzual, Stephane Charlot, Matilde Mingozzi, Cecilia Bacchini, Neven Tomicic, Rory Smith, Andrea Kulier, Giorgia Peluso, Andrea Franchetto

摘要:

本文给出了从$z\sim0.3$到$z\sim0.4$的8个星系团中心的21个星暴后星系的MUSE空间分辨光谱的结果。我们测量空间分辨的恒星形成历史(SFHS),自淬火的时间($t_Q$)和恒星质量的分数组装在过去的1.5 Gyr($μ_{1.5}$)。在21个天体中,有16个在淬灭前的SFH显示出恒星形成的明显增强,至少有10%(最高可达$>50$ %)的恒星质量是在过去的1.5 Gyr内组装的,$t_Q$的范围从不到1亿年到$\sim800$亿年不等。通过对$t_Q$和$μ_{1.5}$的作图,我们分析了星系的猝灭模式。在我们的样本中,大多数星系已经从外向内淬灭了它们的恒星形成,或者显示出一种侧到侧/不规则的模式,这两种模式都与冲压压力剥离的淬灭相一致。只有三个物体显示出由内而外的淬火模式,它们都位于我们样本的高质量端。其中至少有两个星系目前拥有一个活动星系核。在两个后星爆,我们确定了电离气体的尾巴,表明这些对象有他们的气体剥离冲压压力最近。在同一个星系团中经历冲压压力剥离的星系的剥离区域也发现了星暴后的特征,证实了这些类别的物体之间的联系。我们的研究结果指出,在这些环境中,冲压压力剥离作为快速淬火的主要驱动力,活动星系核在高恒星质量下发挥作用。

英文摘要:

We present results from MUSE spatially-resolved spectroscopy of 21 post-starburst galaxies in the centers of 8 clusters from $z\sim0.3$ to $z\sim0.4$. We measure spatially resolved star-formation histories (SFHs), the time since quenching ($t_Q$) and the fraction of stellar mass assembled in the past 1.5 Gyr ($μ_{1.5}$). The SFHs display a clear enhancement of star-formation prior to quenching for 16 out of 21 objects, with at least 10% (and up to $>50$%) of the stellar mass being assembled in the past 1.5 Gyr and $t_Q$ ranging from less than 100 Myrs to $\sim800$ Myrs. By mapping $t_Q$ and $μ_{1.5}$, we analyze the quenching patterns of the galaxies. Most galaxies in our sample have quenched their star-formation from the outside-in or show a side-to-side/irregular pattern, both consistent with quenching by ram-pressure stripping. Only three objects show an inside-out quenching pattern, all of which are at the high-mass end of our sample. At least two of them currently host an active galactic nucleus. In two post-starbursts, we identify tails of ionized gas indicating that these objects had their gas stripped by ram pressure very recently. Post-starburst features are also found in the stripped regions of galaxies undergoing ram-pressure stripping in the same clusters, confirming the link between these classes of objects. Our results point to ram-pressure stripping as the main driver of fast quenching in these environments, with active galactic nuclei playing a role at high stellar masses.

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