论文标题
在最大的Illustristng-100群中，星系的潮汐演变
Tidal evolution of galaxies in the most massive cluster of IllustrisTNG-100
论文作者
论文摘要
我们研究了Illustristng-100模拟的最大群集中星系的潮汐演化。为了这项工作，我们选择了目前具有最大恒星质量的112个星系，并遵循其及时的特性。利用它们的轨道历史，我们将样品分为未进化的（插入），弱进化（带有一个折室），并强烈进化（带有多个折室）。样品清楚地通过集成潮汐力的值与星系在整个演化过程中所经历的群集的值分开，并且它们的性质在很大程度上取决于该数量。由于潮汐剥离的结果，弱进化的样品的星系损失了其深色质量的10％至80％，而恒星的少于10％，而在强烈进化的恒星中，损失了一个超过70％的黑暗，恒星质量的10％至55％，而恒星质量的10％和55％之间，并且显着较小甚至不是黑物质主导。虽然33％的插入星系不含任何气体，但对于弱进化的较低的分数增加到了67％，对于强烈进化的样品而言，这一比例为100％。强烈进化的星系更早，更快地失去了气体（在2-6 Gyr之内），但该过程比第一个周围通道最多需要4 GYR。这些星系是红色的，更富含金属，在红移Z = 0.5时，簇中的星系群主要变成红色。潮汐搅拌的结果，星系的形态从扁平变为碎裂，旋转减少，因此在模拟群集中复制了形态密度的关系。强烈进化的样品至少包含六个令人信服的潮汐杆和六个星系的示例，这些星系通过与群集的相互作用增强了棒。
We study the tidal evolution of galaxies in the most massive cluster of the IllustrisTNG-100 simulation. For the purpose of this work we select 112 galaxies with the largest stellar masses at present and follow their properties in time. Using their orbital history we divide the sample into unevolved (infalling), weakly evolved (with one pericenter passage) and strongly evolved (with multiple pericenters). The samples are clearly separated by the value of the integrated tidal force from the cluster the galaxies experienced during their entire evolution and their properties depend strongly on this quantity. As a result of tidal stripping, the galaxies of the weakly evolved sample lost between 10 and 80% of their dark mass and less than 10% of stars, while those in the strongly evolved one more than 70% of dark and between 10 and 55% of stellar mass, and are significantly less or even not dark matter dominated. While 33% of the infalling galaxies do not contain any gas, this fraction increases to 67% for the weakly evolved and to 100% for the strongly evolved sample. The strongly evolved galaxies lose their gas earlier and faster (within 2-6 Gyr) but the process can take up to 4 Gyr from the first pericenter passage. These galaxies are redder and more metal rich, and at redshift z=0.5 the population of galaxies in the cluster becomes predominantly red. As a result of tidal stirring, the morphology of the galaxies evolves from oblate to prolate and their rotation is diminished thus the morphology-density relation is reproduced in the simulated cluster. The strongly evolved sample contains at least six convincing examples of tidally induced bars and six more galaxies that had their bars enhanced by their interaction with the cluster.
