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arXiv 2111.04501astro-ph.GA
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用MUSE观测中等红移星系团的工作冲压压力:Abell 2744和Abell 370的情况

Observing ram pressure at work in intermediate redshift clusters with MUSE: the case of Abell 2744and Abell 370

A. Moretti, M. Radovich, B. M. Poggianti, B. Vulcani, M. Gullieuszik, A. Werle, C. Bellhouse, C. Bacchini, J. Fritz, G. Soucail, J. Richard, A. Franchetto, N. Tomicic, A. Omizzolo

摘要:

冲压压力剥离已被证明是有效的塑造星系的性质在稠密的环境中在低红移。MUSE观测遥远(z $\sim 0.3-0.5$)星系团样本的可用性允许在显着的回望时间搜索受此现象影响的星系。本文描述了我们如何利用MUSE摄谱仪在两个中等红移(z $\sim$ 0.3-0.4)星系团A2744和A370的中心区域发现和表征13个冲压压力剥离星系。对发射线特性和恒星特征进行了分析,以推断存在这种只剥离气体的机制,这种机制产生了壮观的电离气体尾(H $_α$),甚至更令人惊讶的[OII](3727,3729)离开主星系体。这两个星系团的内部区域揭示了这些星系在蓝色恒星形成的星系团成员中的优势,这表明冲压压力剥离在中等红移比今天的宇宙更有效。有趣的是,在剥离的尾巴中解析的[OII]/H $_α$线比与这些星系的盘相比特别高(与正常的低z星系相当),这表明较低的气体密度和/或与周围热的ICM相互作用。

英文摘要:

Ram pressure stripping has been proven to be effective in shaping galaxy properties in dense environments at low redshift. The availability of MUSE observations of a sample of distant (z$\sim 0.3-0.5$) clusters has allowed to search for galaxies subject to this phenomenon at significant lookback times. In this paper we describe how we discovered and characterized 13 ram-pressure stripped galaxies in the central regions of two intermediate redshift (z$\sim$0.3-0.4) clusters, A2744 and A370, using the MUSE spectrograph. Emission line properties as well as stellar features have been analyzed to infer the presence of this gas--only stripping mechanism, that produces spectacular ionized gas tails (H$_α$ and even more astonishing [OII](3727,3729) departing from the main galaxy body. The inner regions of these two clusters reveal the predominance of such galaxies among blue star-forming cluster members, suggesting that ram-pressure stripping was even more effective at intermediate redshift than in today's Universe. Interestingly, the resolved [OII]/H$_α$ line ratio in the stripped tails is exceptionally high compared to that in the disks of these galaxies, (which is comparable to that in normal low-z galaxies), suggesting lower gas densities and/or an interaction with the hot surrounding ICM.

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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