标题： MUSE巡天中红移中间值星系的恒星角动量 显示英文标题

标题： Stellar angular momentum of intermediate redshift galaxies in MUSE surveys

摘要： 我们通过计算$\lambda_{R}$参数量化星系的恒星自转，该参数是 106 个红移在 0.1$<$z$<$0.8、恒星质量范围为$\sim$10$^{7.5}$到 10$^{11.8}$M$_{\odot}$的星系样本中恒星角动量的替代指标。该样本位于 CANDELS/GOODS-S 和 COSMOS 区域，并由多个 MUSE 巡天观测。 我们利用全光谱拟合技术创建了恒星视向速度和速度弥散图，空间覆盖范围为$\sim$2$R_{e}$的星系。 我们研究了大气视宁度对自转参量的影响，并在相关情况下应用修正。 通过分析$\lambda_{R}-\epsilon$图表，我们注意到圆且质量较大的星系比例随红移增加而增加。 样本中缺乏$\lambda_{R}$< 0.1 的星系，在红移 z$\sim0.3$处我们仅发现一个可能但不确定的低质量慢速旋转星系。 此外，我们没有观察到恒星角动量随红移有明显的演化或趋势。 我们使用两种指标来描述样本环境：基于Voronoi镶嵌方法的局部估计器和通过Friends-of-Friends算法得出的全局估计器。 由于我们并未探测到密集区域或大质量星系结构，因此未发现环境与$\lambda_{R}$之间存在相关性。 我们还分析了样本的运动学图，发现大约有 40$\%$的星系与规则旋转星系一致，具有平坦速度弥散图的旋转恒星盘，而有$\sim20\%$的星系具有复杂的运动学图，并且尽管它们的$\lambda_{R}$值，仍可被识别为非规则旋转星系。对于剩余的星系，分类尚不确定。由于缺乏$\lambda_{R}$< 0.1 的星系，我们无法确定星系在所研究的环境、区域和红移范围内何时成为慢速旋转星系。 显示英文摘要

摘要： We quantify the stellar rotation of galaxies by computing the $\lambda_{R}$ parameter, a proxy for the stellar angular momentum in a sample of 106 galaxies with redshift 0.1 $<$ z $<$ 0.8 and stellar masses from $\sim$10$^{7.5}$ to 10$^{11.8}$ M$_{\odot}$. The sample is located in the CANDELS/GOODS-S and COSMOS fields, and it was observed by various MUSE surveys. We create stellar velocity and velocity dispersion maps using a full-spectrum fitting technique, covering spatially $\sim$2$R_{e}$ for the galaxies. We study the impact of the atmospheric seeing on the spin parameter and apply corrections when pertinent. Through the analysis of the $\lambda_{R}-\epsilon$ diagram, we notice that the fraction of round and massive galaxies increases with redshift. We lack galaxies with $\lambda_{R}$ < 0.1 in the sample and we find only one potential, but uncertain, low-mass slow rotator at z $\sim0.3$. Moreover, we do not see an evident evolution or trend in the stellar angular momentum with redshift. We characterize the sample environment using two indicators: a local estimator based on the Voronoi tesselation method, and a global estimator derived by the use of the Friends-of-Friends algorithm. We find no correlation between the environment and $\lambda_{R}$ given that we are not probing dense regions or massive galaxy structures. We also analyze the kinematic maps of the sample finding that about 40$\%$ of galaxies are consistent with being regular rotators, having rotating stellar discs with flat velocity dispersion maps, while $\sim20\%$ of galaxies have complex velocity maps and can be identified as non-regular rotators in spite of their $\lambda_{R}$ values. For the remaining galaxies the classification is uncertain. As we lack galaxies with $\lambda_{R}$< 0.1, we are not able to identify when galaxies become slow rotators within the surveyed environments, area and redshift range.