GASP。XII。形成中的单个星系群中发生的各种物理过程
GASP. XII. The variety of physical processes occurring in a single galaxy group in formation
摘要：
GAS-Stripping Phenomenon in galaxies with MUSE（GASP）是一个旨在研究不同环境中邻近星系气体去除过程的计划。我们提出了四个星系的研究，是同一组（z= 0.06359）的一部分，并强调了众多的机制影响的空间分辨性能的组成员。一个星系是被动的，并显示出规则的恒星运动学。对它的恒星形成历史的分析表明，淬灭过程持续了几个Gyr，而恒星形成在整个盘中以类似的方式下降，与扼杀一致。另一个星系的特征是一个双组分恒星盘，其中有一个扩展的气体盘，形成于10^8年前，很可能是气体吸积的结果。第三个成员是一个位于星系群边缘的螺旋星系，但嵌入在一个暗条中。我们假设稀疏的星系际介质对稠密的环星系气体施加的压缩，在星系周围的一些云中打开了恒星形成的开关（“宇宙网增强”）。或者，冲压压力汽提也可能有效。最后，第四个星系是一个螺旋形的截断电离气体盘和未受干扰的恒星运动学。星系恢复压力的分析模型，以及它在星系团中的位置和速度，表明冲压压力是最有可能的物理机制。这是第一个群体剥脱的光学证据。
英文摘要：
GAs Stripping Phenomena in galaxies with MUSE (GASP) is a program aimed at studying gas removal processes in nearby galaxies in different environments. We present the study of four galaxies that are part of the same group (z= 0.06359) and highlight the multitude of mechanisms affecting the spatially resolved properties of the group members. One galaxy is passive and shows a regular stellar kinematics. The analysis of its star formation history indicates that the quenching process lasted for a few Gyr and that the star formation declined throughout the disk in a similar way, consistent with strangulation. Another galaxy is characterised by a two-component stellar disk with an extended gas disk that formed a few 10^8 yr ago, most likely as a consequence of gas accretion. The third member is a spiral galaxy at the edges of the group, but embedded in a filament. We hypothesise that the compression exerted by the sparse intergalactic medium on the dense circumgalactic gas switches on star formation in a number of clouds surrounding the galaxy ("cosmic web enhancement"). Alternatively, also ram pressure stripping might be effective. Finally, the fourth galaxy is a spiral with a truncated ionised gas disk and an undisturbed stellar kinematics. An analytical model of the galaxy's restoring pressure, and its location and velocity within the cluster, suggest ram pressure is the most likely physical mechanism in action. This is the first optical evidence for stripping in groups.
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