Coma Legacy IFU调查早期成果：湍流压力诱导的冲击波与水母尾部的电离
Early Results from the Coma Legacy IFU Survey (CLIFS): Ram Pressure Induced Shocks and Ionization in Jellyfish Tails
AI总结：
CLIFS调查发现湍流压力驱动的冲击波主导水母星系尾部的电离发射，通过分析发射线特性揭示尾部电离气体的来源。
摘要：
水母星系表现出与运动方向相反的气体尾部，是展示湍流压力剥离（RPS）最极端效应的星系群体。我们呈现了在Coma团块中通过WEAVE Large-IFU观测的五个初步水母星系的发射线特性。当完整时，CLIFS将形成一个由无线电连续波中单侧尾部存在所选择的29个水母星系样本，使Coma团块中湍流压力对星系影响的全面图景得以呈现。我们提取了发射线特性，并确认了从WEAVE和MaNGA测量的盘荧光在两个调查有重叠盘覆盖区域的星系中具有一致性。通过比较解析无线电和基于Hα的恒星形成率，我们发现，与盘相比，尾部发射的主要来源并非恒星形成。我们发现尾部中存在由湍流压力驱动的冲击波激发的弥散电离气体的证据，这表明：（1）通过[OI]/Hα BPT诊断显示的类似LINER型尾部发射；（2）尾部中[OII]/Hα比值相对于盘的增强；以及（3）尾部中发射线速度和速度分散度与盘相比同样升高。这些结果表明，湍流压力驱动的冲击波主导了水母星系尾部的电离发射。
英文摘要：
Jellyfish galaxies, which exhibit tails of gas opposite to their direction of motion, are a galaxy population showcasing the most extreme effects of ram pressure stripping (RPS). We present the emission line properties of a preliminary sample of five jellyfish galaxies in the Coma cluster, observed with the WEAVE Large-IFU as part of the Coma Legacy IFU Survey (CLIFS). When complete, CLIFS will form a sample of 29 jellyfish galaxies in Coma, selected based on the presence of one-sided tails in the radio continuum, enabling a comprehensive picture of the effects of ram pressure on galaxies in the Coma cluster. We extract emission line properties and confirm consistency between disk fluxes measured from WEAVE and MaNGA for galaxies with overlapping disk coverage between surveys. Comparing resolved radio and H$α$-based star formation rates, we find that, in contrast to the disk, the dominant source of tail emission is not star formation. We find evidence for diffuse ionized gas excited by RPS-driven shocks in the tails, as indicated by: (1) LINER-like tail emission with the [OI]/H$α$ BPT diagnostic; (2) enhanced [OII]/H$α$ ratios in the tails relative to the disks; and (3) similarly elevated emission line velocities and velocity dispersions in the tails with respect to the disks. These results demonstrate that ram-pressure-driven shocks dominate the ionized emission in jellyfish galaxy tails.
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