BreakBRD星系：通过气体含量分析揭示演化线索
BreakBRD Galaxies: Evolutionary Clues Through an Analysis of Gas Content
AI总结：
本文通过GBT 21厘米观测和光学光谱数据研究BreakBRD星系的气体含量，发现其HI分数低于恒星形成主序星系但高于绿谷星系，HI耗尽时间极短，气体速度场高度扭曲，表明其处于熄灭早期阶段且可能与并合活动有关。
摘要：
通过将新获取的深度绿岸望远镜（GBT）21厘米观测数据与光学光谱数据相结合，我们对BreakBRD星系的气体含量进行了分析。BreakBRD星系是一类以蓝色恒星形成中心和红色熄灭盘面为特征的星系群体，它们似乎并不遵循旋涡星系典型的由内向外演化模式。我们证实了先前的结果，即BreakBRD星系的中性原子氢（HI）气体分数平均低于恒星形成主序（SFS）上的典型星系，同时发现它们的HI分数普遍高于绿谷（GV）星系。BreakBRD星系的HI耗尽时间比SFS星系大约低一个数量级，这与GV星系形成鲜明对比，后者通常具有比SFS星系长得多的耗尽时间。BreakBRD星系的核区气相金属丰度分布比SFS星系更宽，并且偏向略高于平均值的范围。BreakBRD星系在重子塔利-费舍尔关系中系统性偏离，在给定旋转速度下具有更低的重子质量。它们还具有比SFS星系更高的典型HI不对称性，并且在那些具有SDSS-IV MaNGA巡天空间分辨气体速度场的星系中，三分之二的星系相对于恒星盘要么高度扭曲，要么完全错位。证据支持这样一种情景：BreakBRD星系正处于熄灭的早期阶段，同时存在混合证据表明它们的行为与过去的并合活动有关。
英文摘要：
By combining newly obtained deep GBT 21cm observations with optical spectroscopic data, we present an analysis of the gas content of BreakBRD galaxies, a population denoted by their blue star-forming centers and red quenched disks that do not appear to follow the typical inside-out evolution of spiral galaxies. We confirm previous results that the neutral atomic hydrogen (HI) gas fractions of BreakBRDs are on-average lower than those of typical galaxies on the star-forming sequence (SFS), and find that their \ion{H}{1} fractions are generally higher than Green Valley (GV) galaxies. HI depletion times for BreakBRDs are roughly an order of magnitude lower than those of SFS galaxies, in stark contrast with GV galaxies that typically have much longer depletion times than SFS galaxies. The nuclear gas-phase metallicities of BreakBRDs have a broader distribution than SFS galaxies and are skewed towards slightly above-average values. BreakBRDs are systematically offset from the Baryonic Tully-Fisher Relation towards lower baryonic mass at a given rotation velocity. They also have higher typical HI asymmetries than SFS galaxies, and of those galaxies with spatially resolved gas velocity fields from the SDSS-IV MaNGA survey, two-thirds are either highly distorted or completely misaligned relative to the stellar disk. Evidence supports a scenario where BreakBRDs are in an early phase of quenching, and there is mixed evidence that their behavior is related to past merger activity.
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