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A universal correlation between warm and hot gas in the stripped tails of cluster galaxies
Nature Astronomy ( IF 14.1 ) Pub Date : 2021-12-13 , DOI: 10.1038/s41550-021-01516-8
Ming Sun 1 , Chong Ge 1 , Rongxin Luo 1 , Masafumi Yagi 2 , Pavel Jáchym 3 , Alessandro Boselli 4 , Matteo Fossati 5, 6 , Giuseppe Gavazzi 5 , Paul E. J. Nulsen 7, 8 , Michitoshi Yoshida 9
Affiliation  

The impact of ram pressure stripping on galaxy evolution is well known (for example, ref. 1). Recent multi-wavelength data have revealed many examples of galaxies undergoing stripping, often accompanied with multi-phase tails2,3,4,5,6,7,8,9,10,11,12,13. As energy transfer in the multi-phase medium is an outstanding question in astrophysics, galaxies in stripping are great objects to study. Despite the recent burst of observational evidence, the relationship between gas in different phases in the tails is poorly known. Here we report a strong linear correlation between the X-ray surface brightness and the Hα surface brightness of the diffuse gas in the stripped tails at ~10–40 kpc scales, with a slope of ~3.5. This discovery provides evidence for the mixing of the stripped interstellar medium with the hot intra-cluster medium as the origin of the multi-phase tails. The established relation in stripped tails, also in comparison with the probably related correlations in similar environments such as galactic winds and X-ray cool cores, provides an important test for models of energy transfer in the multi-phase gas. It also indicates the importance of the Hα data to study clumping and turbulence in the intra-cluster medium.



中文翻译:

星系团剥离尾巴中的暖气和热气之间的普遍相关性

冲压压力剥离对星系演化的影响是众所周知的(例如,参考文献1)。最近的多波长数据揭示了许多星系正在剥离的例子,通常伴随着多相尾2,3,4,5,6,7,8,9,10,11,12,13. 由于多相介质中的能量转移是天体物理学中的一个突出问题,因此剥离中的星系是研究的重要对象。尽管最近有大量的观测证据,但尾巴中不同阶段的气体之间的关系却鲜为人知。在这里,我们报告了 X 射线表面亮度与剥离尾中扩散气体的 Hα 表面亮度之间的强线性相关性,在 ~10-40 kpc 尺度下,斜率为 ~3.5。这一发现为剥离的星际介质与热的星团内介质的混合提供了证据,作为多相尾的起源。剥离尾巴的既定关系,也与银河风和 X 射线冷核等类似环境中可能相关的相关性进行比较,为多相气体中的能量转移模型提供了重要的检验。它还表明了 Hα 数据对研究簇内介质中的结块和湍流的重要性。

更新日期:2021-12-13
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