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arXiv 1609.08158astro-ph.GA
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对中央分子带气体星形成周期的多尺度理解

Towards a multi-scale understanding of the gas-star formation cycle in the Central Molecular Zone

J. M. Diederik Kruijssen

摘要:

中央分子带(Central Molecular Zone,CMZ,银河系中央500 pc)包含银河系中最大的高密度分子气体库,但形成恒星的速率比通常使用的恒星形成关系低10-100倍。我们讨论最近的努力,了解最近的星系核如何形成它的恒星。最新的模型的气体流入,恒星形成,和反馈占空比再现的CMZ的主要可观察到的功能,表明恒星形成是情节和CMZ目前居住在恒星形成的最小值。使用轨道建模,我们推导出的三维几何形状的CMZ,并显示如何轨道动力学和恒星形成的气体的潜力是紧密耦合的。我们讨论了这种耦合如何揭示恒星形成的物理和反馈的条件下看到的高红移星系,并促进形成的星系中的致密星团。

英文摘要:

The Central Molecular Zone (CMZ, the central 500 pc of the Milky Way) contains the largest reservoir of high-density molecular gas in the Galaxy, but forms stars at a rate 10-100 times below commonly-used star formation relations. We discuss recent efforts in understanding how the nearest galactic nucleus forms its stars. The latest models of the gas inflow, star formation, and feedback duty cycle reproduce the main observable features of the CMZ, showing that star formation is episodic and that the CMZ currently resides at a star formation minimum. Using orbital modelling, we derive the three-dimensional geometry of the CMZ and show how the orbital dynamics and the star formation potential of the gas are closely coupled. We discuss how this coupling reveals the physics of star formation and feedback under the conditions seen in high-redshift galaxies, and promotes the formation of the densest stellar clusters in the Galaxy.

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