arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.05795astro-ph.GA
收藏

恒星形成星系的解剖:模拟星系中恒星形成的压力驱动调节

The anatomy of a star-forming galaxy: Pressure-driven regulation of star formation in simulated galaxies

S. M. Benincasa, J. Wadsley, H. M. P. Couchman, B. W. Keller

摘要:

我们通过一套高分辨率的孤立星系模拟来探索恒星形成星系中恒星形成的规律。我们使用SPH代码GASOLINE,包括光电加热和金属冷却,产生多相星际介质。我们表明,代表性的恒星形成和反馈子网格模型自然会导致恒星形成的数量和恒星形成参数的变化之间的弱,次线性依赖。我们将这些子网格模型到一个平衡压力驱动的监管框架。我们发现,次线性标度的出现作为一个后果的非线性关系的规模高度和恒星反馈产生的有效压力。因此,模拟的恒星形成规则对ISM中垂直结构的解决方式很敏感。完整的星系盘经历密度波,驱动局部时间依赖的恒星形成。我们开发了一个简单的时间依赖性,压力驱动的模型,再现的响应非常好。

英文摘要:

We explore the regulation of star formation in star-forming galaxies through a suite of high-resolution isolated galaxy simulations. We use the SPH code GASOLINE, including photoelectric heating and metal cooling, which produces a multi-phase interstellar medium. We show that representative star formation and feedback sub-grid models naturally lead to a weak, sub-linear dependence between the amount of star formation and changes to star formation parameters. We incorporate these sub-grid models into an equilibrium pressure-driven regulation framework. We show that the sub-linear scaling arises as a consequence of the non-linear relationship between scale height and the effective pressure generated by stellar feedback. Thus, simulated star-formation regulation is sensitive to how well vertical structure in the ISM is resolved. Full galaxy disks experience density waves which drive locally time-dependent star formation. We develop a simple time-dependent, pressure-driven model that reproduces the response extremely well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑