标题： 具有强阻尼Lyman-alpha吸收线系统的星系对应体的SINFONI积分场光谱调查 - II. Q0302-223和Q1009-0026方向星系的动力学性质 显示英文标题

标题： A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to Damped Lyman-alpha Systems - II. Dynamical Properties of the Galaxies towards Q0302-223 and Q1009-0026

摘要： 为了全面了解星系的形成过程，需要研究星系将气体转化为恒星的具体机制。 解决这些现象的一种方法是将星系中的氢气和恒星联系起来。 在这里，我们展示了通过近红外波段利用VLT/SINFONI观测到的Hα发射线所识别出的吸收线系统的动力学特性，这些系统包括强（DLA）和弱（sub-DLA）Lyman-alpha吸收系统。 我们发现Q0302-223方向上的DLA是弥散主导的，而Q1009-0026方向上的sub-DLA则显示出明显的旋转特征。 我们使用一个圆周速度的代理来估计sub-DLA所在的暗晕质量，并得到M_halo=10^12.6 M_sun。 我们还推导了这些系统的动力学质量，分别为M_dyn=10^10.3 M_sun 和 10^10.9 M_sun。 对于其中两个系统之一（指向Q0302-223），我们能够从光谱能量分布拟合得出恒星质量为M_*=10^9.5 M_sun。 该对象的气体比例为1/3，与同一红移下的类似对象相当。 我们的工作表明，对类星体吸收体的详细研究可以为我们提供关于星系中恒星与星际气体相互作用的新见解。 显示英文摘要

摘要： Details of processes through which galaxies convert their gas into stars need to be studied in order to obtain a complete picture of galaxy formation. One way to tackle these phenomena is to relate the HI gas and the stars in galaxies. Here, we present dynamical properties of Damped and sub-Damped Lyman-alpha Systems identified in H-alpha emission with VLT/SINFONI at near infra-red wavelengths. While the DLA towards Q0302-223 is found to be dispersion-dominated, the sub-DLA towards Q1009-0026 shows clear signatures of rotation. We use a proxy to circular velocity to estimate the mass of the halo in which the sub-DLA resides and find M_halo=10^12.6 M_sun. We also derive dynamical masses of these objects, and find M_dyn=10^10.3 M_sun and 10^10.9 M_sun. For one of the two systems (towards Q0302-223), we are able to derive a stellar mass of M_*=10^9.5 M_sun from Spectral Energy Distribution fit. The gas fraction in this object is 1/3rd, comparable to similar objects at these redshifts. Our work illustrates that detailed studies of quasar absorbers can offer entirely new insights into our knowledge of the interaction between stars and the interstellar gas in galaxies.