KMOS星系演化巡天（KGES）：过去~10 Gyr恒星形成星系的angular momentum
The KMOS Galaxy Evolution Survey (KGES): the angular momentum of star-forming galaxies over the last ~10 Gyr
摘要：
我们介绍了KMOS星系演化巡天（KGES），一个$K$波段多目标摄谱仪（KMOS）研究的H $α$和[NII]发射从288 $K$波段选择星系在$1.2 \lesssim z \lesssim 1.8$，与恒星质量范围$\log_{10}(M_{*}/\rm{M}_{\odot})\approx$ 9-11.5。在本文中，我们描述了调查设计，提出了样本，并讨论了KGES星系的关键属性。我们将KGES与KMOS红移一光谱巡天（KROSS）和SAMI星系巡天的较低红移处的适当匹配样本相结合。考虑到样本选择、数据质量和测量之间分析技术的影响，我们研究了$z\approx1.5$、$\approx1$和$\approx0$上恒星形成星系的运动学特征和角动量含量。我们发现，恒星质量，而不是红移，最强烈的相关性与光盘之间的恒星形成星系在$z \lesssim 1.5$的分数，观察只有适度增加之间的流行光盘$z\approx1.5$和$z\approx0.04$在固定的恒星质量。此外，典型的恒星形成星系遵循相同的特定角动量和恒星质量之间的中值关系，不管它们的红移如何，关系的归一化更强烈地依赖于星系的运动学是如何盘状的。这表明，在我们的研究所涵盖的$\approx$ 10 Gyr中，大质量的恒星形成盘以非常相似的方式形成，并且在这项工作中探测的恒星质量和红移范围内，星系角动量与其晕之间的推断联系并没有显着变化。
英文摘要：
We present the KMOS Galaxy Evolution Survey (KGES), a $K$-band Multi-Object Spectrograph (KMOS) study of the H$α$ and [NII] emission from 288 $K$ band-selected galaxies at $1.2 \lesssim z \lesssim 1.8$, with stellar masses in the range $\log_{10}(M_{*}/\rm{M}_{\odot})\approx$9-11.5. In this paper, we describe the survey design, present the sample, and discuss the key properties of the KGES galaxies. We combine KGES with appropriately matched samples at lower redshifts from the KMOS Redshift One Spectroscopic Survey (KROSS) and the SAMI Galaxy Survey. Accounting for the effects of sample selection, data quality, and analysis techniques between surveys, we examine the kinematic characteristics and angular momentum content of star-forming galaxies at $z\approx1.5$, $\approx1$ and $\approx0$. We find that stellar mass, rather than redshift, most strongly correlates with the disc fraction amongst star-forming galaxies at $z \lesssim 1.5$, observing only a modest increase in the prevalence of discs between $z\approx1.5$ and $z\approx0.04$ at fixed stellar mass. Furthermore, typical star-forming galaxies follow the same median relation between specific angular momentum and stellar mass, regardless of their redshift, with the normalisation of the relation depending more strongly on how disc-like a galaxy's kinematics are. This suggests that massive star-forming discs form in a very similar manner across the $\approx$ 10 Gyr encompassed by our study and that the inferred link between the angular momentum of galaxies and their haloes does not change significantly across the stellar mass and redshift ranges probed in this work.
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