The interplay between IRDC Formation and the Birth of Massive Stars

IRDC 形成与大质量恒星诞生之间的相互作用

• 批准号: 203200777
• 负责人: Dr. Rowan Smith, Ph.D.
• 金额: --
• 依托单位: School of Physics and Astronomy
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/203200777?language=en
• 关键词: interplay; between; IRDC; Formation; Birth

Infrared Dark Clouds (IRDCs) are dense clouds of gas seen as absorption features against the Galactic plane. Due to their high densities, large masses and low temperatures, IRDCs are thought to be young molecular clouds which are just beginning to form stars. In this project we seek to study how effectively IRDCs are formed from gas that passes through the spiral shock of a galaxy, and the implications of this formation process upon the evolution and future star formation within the cloud. Many IRDCs appear to be forming massive stars, but it is unclear whether this is a ubiquitous outcome of IRDC formation. By performing numerical simulations of a range of IRDCs, we plan to address how common massive star formation is in these objects. In order to achieve these goals, we will use cutting edge numerical techniques to follow the entire early life cycle of the IRDCs, from formation out of the diffuse ISM, to the formation of the first massive protostars. By using a time dependent chemical network we will accurately capture the local thermodynamics, self-consistently follow the formation of the molecules within the dense gas, and derive abundance maps of the IRDCs. This will enable us to create publicly available, synthetic observations of our simulations which will be of considerable use when interpreting the results of current and future IRDC observations from facilities such as Herschel and ALMA.

红外暗云（IRDC）是致密的气体云，被视为银河系平面的吸收特征。由于其高密度、大质量和低温，IRDC被认为是刚刚开始形成恒星的年轻分子云。在这个项目中，我们试图研究如何有效地IRDC形成的气体，通过星系的螺旋激波，以及这种形成过程的演变和未来的星星形成云的影响。许多IRDC似乎正在形成大质量恒星，但目前还不清楚这是否是IRDC形成的普遍结果。通过对一系列IRDC进行数值模拟，我们计划解决这些物体中大质量星星形成的常见性。为了实现这些目标，我们将使用最先进的数值技术来跟踪IRDC的整个早期生命周期，从弥漫ISM的形成到第一颗大质量原恒星的形成。通过使用时间依赖的化学网络，我们将准确地捕捉到当地的热力学，自洽地遵循致密气体内的分子的形成，并推导出IRDC的丰度图。这将使我们能够创建公开可用的，我们的模拟，这将是相当大的使用时，解释当前和未来的IRDC的观测结果，如赫歇尔和阿尔马设施的合成观测。