高红移恒星形成星系中超新星爆发驱动的气体盘粘性演化
Evolution of gaseous disk viscosity driven by supernova explosion in star-forming galaxies at high redshift
摘要：
由Genzel et al.的观测结果，我们建立了一组方程描述气体盘的动力学演化，包括恒星形成及其反馈。角动量的输运是由于恒星形成区超新星爆炸引起的“湍流”粘性。对于气体环的初始情况和气体圆盘的积分形式，分别找到了方程的解析解。对于一个粘性足够低的环，它在初始半径附近以缓慢的气体扩散和恒星形成过程演化。对于高粘度，环在早期阶段迅速扩散。扩散驱动环进入具有低粘度的区域，并开始在降低的粘度扭矩之后的半径处经历气体堆积的第二阶段。第三个阶段是急剧减少的阶段，因为恒星的形成消耗了气体，气体有效地向内输送形成了恒星盘。我们将该模型应用于两个$z\sim 2$星系BX 482和BzK 6004，发现它们的恒星形成活动正在下降。
英文摘要：
Motivated by Genzel et al.'s observations of high-redshift star-forming galaxies, containing clumpy and turbulent rings or disks, we build a set of equations describing the dynamical evolution of gaseous disks with inclusion of star formation and its feedback. Transport of angular momentum is due to "turbulent" viscosity induced by supernova explosions in the star formation region. Analytical solutions of the equations are found for the initial cases of a gaseous ring and the integrated form for a gaseous disk, respectively. For a ring with enough low viscosity, it evolves in a slow processes of gaseous diffusion and star formation near the initial radius. For a high viscosity, the ring rapidly diffuses in the early phase. The diffusion drives the ring into a region with a low viscosity and start the second phase undergoing pile-up of gas at a radius following the decreased viscosity torque. The third is a sharply deceasing phase because of star formation consumption of gas and efficient transportation of gas inward forming a stellar disk. We apply the model to two $z\sim 2$ galaxies BX 482 and BzK 6004, and find that they are undergoing a decline in their star formation activity.
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