论文标题
通过潮汐去除中等红移大量巨大的恒星后银河系的冷分子气体的潮汐消除。
Star Formation Suppresion by Tidal Removal of Cold Molecular Gas from an Intermediate-Redshift Massive Post-Starburst Galaxy
论文作者
论文摘要
观察结果和模拟表明，必须积极抑制星系中的恒星形成，以防止形成过度的星系。经常引用由恒星反馈或超级黑洞积聚驱动的银河流出，以调节可用于未来恒星形成的冷分子气体的量，但可能不是所有星系中唯一相关的淬火过程。我们介绍了在巨大的Z = 0.646巨大的Z = 0.646恒星星银河系以外的巨大分子潮汐特征，该特征最近结束了其主要的恒星形成事件。潮汐尾部包含（1.2 +/- 0.1）x10^10分子气体，47 +/- 5％的系统总冷气储存库。与附近或高红移合并系统相比，分子潮汐特征的规模和大小都是前所未有的。我们推断合并期间从宿主星系中剥离了冷气，这很可能导致触发初始爆发阶段和随后抑制恒星形成。虽然只有一个例子，但该结果表明，星系合并可以通过直接去除大部分分子气体燃料来调节遥远星系中的冷气含量，并直接抑制星形形成，这是一种与反馈驱动的溢出相比，一种定性上不同的物理机制。
Observations and simulations have demonstrated that star formation in galaxies must be actively suppressed to prevent the formation of over-massive galaxies. Galactic outflows driven by stellar feedback or supermassive black hole accretion are often invoked to regulate the amount of cold molecular gas available for future star formation, but may not be the only relevant quenching processes in all galaxies. We present the discovery of vast molecular tidal features extending up to 64 kpc outside of a massive z=0.646 post-starburst galaxy that recently concluded its primary star-forming episode. The tidal tails contain (1.2 +/- 0.1)x10^10 Msun of molecular gas, 47 +/- 5 % of the total cold gas reservoir of the system. Both the scale and magnitude of the molecular tidal features are unprecedented compared to all known nearby or high-redshift merging systems. We infer that the cold gas was stripped from the host galaxies during the merger, which is most likely responsible for triggering the initial burst phase and the subsequent suppression of star formation. While only a single example, this result shows that galaxy mergers can regulate the cold gas contents in distant galaxies by directly removing a large fraction of the molecular gas fuel, and plausibly suppress star formation directly, a qualitatively different physical mechanism than feedback-driven outflows.
