论文标题
关于银河磁盘的角动量历史
On the Angular Momentum History of Galactic Disks
论文作者
论文摘要
银河系盘的恒星质量，大小和旋转速度都从红移〜2生长到现在，从观察得出的缩放关系中估计的量。然后估计这三个数量的恒星磁盘的角动量，估计会在〜20至〜50之间增长，而其他证据则表明增加了中等的增加。这就要求积聚气体的特定角动量应系统地增加，同时在最后一个〜10 Gyr的大部分时间内与磁盘共旋转。因此，伴生培养基的重型气体涡度似乎是银河进化的主要驱动力，本文旨在吸引人们对角动量增加的巨大大小的关注，并且需要探索在本质和/或模拟中可以观察到的程度。
The stellar mass, size and rotational velocity of galactic disks all grow from redshift ~2 to the present by amounts that are estimated from observationally derived scaling relations. The product of these three quantities, the angular momentum of stellar disks, is then estimated to grow by a remarkably large factor, between ~20 and ~50, whereas other evidences suggest a more moderate increase. This requires that the specific angular momentum of the accreted gas should systematically increase with time while remaining co-rotational with the disk over most of the last ~10 Gyr. Thus, the baryonic gas vorticity of the circumgalactic medium appears to emerge as a major driver in galaxy evolution, and this paper is meant to attract attention on the sheer size of the angular momentum increase and on the need to explore to which extent this can be observed in nature and/or in simulations.
