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arXiv 0705.3765astro-ph
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冷暗云:恒星形成的初始条件

Cold Dark Clouds: The Initial Conditions for Star Formation

Edwin A. Bergin, Mario Tafalla

摘要:

冷的暗云是银河系星际介质中最冷的阶段,也是最容易到达的地方,像我们的太阳这样的恒星正在诞生。在这篇综述中,我们讨论了最近的研究进展,包括新发现的红外暗云,可能是星团的前兆。在大尺度上,乌云呈现出以超音速湍流为主的运动的非常规质量分布。在小的,亚秒差距的尺度下,亚音速无星核的人口提供了一个独特的恒星诞生前的条件一瞥。最近对无星核心的研究揭示了简单的物理性质与复杂的化学结构的结合,这种结构由分子冻结到冷尘埃颗粒上所主导。阐明这种组合结构既是一个观测挑战,也是一个理论挑战,其解决方案将使我们更接近于理解分子气体如何凝聚形成恒星。

英文摘要:

Cold dark clouds are nearby members of the densest and coldest phase in the galactic interstellar medium, and represent the most accessible sites where stars like our Sun are currently being born. In this review we discuss recent progress in their study, including the newly discovered infrared dark clouds that are likely precursors to stellar clusters. At large scales, dark clouds present filamentary mass distributions with motions dominated by supersonic turbulence. At small, sub-parsec scales, a population of subsonic starless cores provides a unique glimpse of the conditions prior to stellar birth. Recent studies of starless cores reveal a combination of simple physical properties together with a complex chemical structure dominated by the freeze-out of molecules onto cold dust grains. Elucidating this combined structure is both an observational and theoretical challenge whose solution will bring us closer to understanding how molecular gas condenses to form stars.

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。

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