SINS高红移恒星形成星系团的运动学：区分旋转星系团和大合并星系团
Kinemetry of SINS High-Redshift Star-Forming Galaxies: Distinguishing Rotating Disks from Major Mergers
摘要：
我们提出了一套简单的运动学标准，可以区分星系为主的有序旋转运动和那些参与重大合并事件。我们的标准是基于星系内温暖的电离气体（如H-α跟踪）的动力学，使得这种分析可以访问高红移系统，其运动学主要是通过发射特征可追溯的。使用的方法kinemetry（Krajnovic和同事开发的），我们量化的不对称性的速度和速度色散图的温暖的气体，和由此产生的标准，使我们能够凭经验区分非合并和合并系统在高红移。我们应用这些标准，我们最好的研究休息帧UV/光学选择z~2星系，我们有近红外积分场光谱数据从SINFONI的VLT。在这11个系统中，我们发现>50%的系统具有与单一旋转盘解释一致的运动学，而其余的系统更有可能经历重大合并。这一结果，结合这些系统的短形成时间尺度，提供了证据表明，快速，平稳的气体吸积在高红移的星系形成中起着重要作用。
英文摘要：
We present a simple set of kinematic criteria that can distinguish between galaxies dominated by ordered rotational motion and those involved in major merger events. Our criteria are based on the dynamics of the warm ionized gas (as traced by H-alpha) within galaxies, making this analysis accessible to high-redshift systems, whose kinematics are primarily traceable through emission features. Using the method of kinemetry (developed by Krajnovic and co-workers), we quantify asymmetries in both the velocity and velocity dispersion maps of the warm gas, and the resulting criteria enable us to empirically differentiate between non-merging and merging systems at high redshift. We apply these criteria to 11 of our best-studied rest-frame UV/optical-selected z~2 galaxies for which we have near infrared integral field spectroscopic data from SINFONI on the VLT. Of these 11 systems, we find that >50% have kinematics consistent with a single rotating disk interpretation, while the remaining systems are more likely undergoing major mergers. This result, combined with the short formation timescales of these systems, provides evidence that rapid, smooth accretion of gas plays a significant role in galaxy formation at high redshift.
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