盘状星系中恒星形成的外部压力触发：正反馈的模板
External pressure-triggering of star formation in a disc galaxy: a template for positive feedback
摘要：
活动星系核（AGN）的反馈经常被用于模拟和解释观测，以调节大质量星系中的恒星形成和淬火冷却流。然而，活动星系核的活动也会使星系中致密的恒星形成区域压力过大，从而促进恒星的形成，导致正反馈效应。为了更好地了解这种增压，我们调查的气体碎片和触发的恒星爆发活动的流体动力学模拟装置的环境外部压力的影响。我们发现，适度水平的过度加压的星系提高了一个数量级的星系的全球恒星形成率，把稳定的光盘不稳定，并导致显着的碎片的气体含量的星系，类似于观察到的高红移星系。
英文摘要：
Feedback from active galactic nuclei (AGN) has often been invoked both in simulations and in interpreting observations for regulating star formation and quenching cooling flows in massive galaxies. AGN activity can, however, also over-pressurise the dense star-forming regions of galaxies and thus enhance star formation, leading to a positive feedback effect. To understand this pressurisation better, we investigate the effect of an ambient external pressure on gas fragmentation and triggering of starburst activity by means of hydrodynamical simulations. We find that moderate levels of over-pressurisation of the galaxy boost the global star formation rate of the galaxy by an order of magnitude, turn stable discs unstable, and lead to significant fragmentation of the gas content of the galaxy, similar to what is observed in high redshift galaxies.
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