紫外线选择星系样本中气体运动学的OSIRIS研究：局部宇宙中“热而扰”星暴的证据
An OSIRIS study of the gas kinematics in a sample of UV-selected galaxies: Evidence of "Hot and Bothered" starbursts in the local Universe
摘要：
我们目前的数据，从积分场光谱的3超紧凑紫外发光星系（ScUVLGs）。ScUVLG是一个近距离（z~0.2）、致密（R_50~1-2 kpc）、明亮的Paschen-alpha源，具有异常高的恒星形成率（SFR=3-100 M_sun/yr），是研究恒星形成活跃星系详细运动学和动力学的理想星群。此外，ScUVLGs似乎是很好的类似物高红移莱曼Break Galerkin（LBG）和我们的研究结果可能会提供更多的洞察LBG的动态。我们团队以前的工作表明，这些星系的形态表现出潮汐特征和同伴，在这项研究中，我们发现ScUVLG的动力学主要由发射线气体的扰动运动学主导-这表明这些星系经历了最近的反馈，相互作用或合并。虽然3个星系中有2个确实显示出旋转，但v/sigma < 1 -这表明色散主导了运动学，而不是平滑的旋转。我们还模拟了这些观测值在z~2处的表现。较低的分辨率和低表面亮度特征的丢失导致低z（观测）和高z（模拟）解释之间存在一些明显的差异，并定量地给出了不同的v/sigma值，但这些低z模拟物的模拟能够很好地检测到最亮的区域，并类似于LBG的实际高z观测。
英文摘要：
We present data from Integral Field Spectroscopy for 3 supercompact UV-Luminous Galaxies (ScUVLGs). As nearby (z~0.2), compact (R_50~1-2 kpc), bright Paschen-alpha sources, with unusually high star formation rates (SFR=3-100 M_sun/yr), ScUVLGs are an ideal population for studying detailed kinematics and dynamics in actively star-forming galaxies. In addition, ScUVLGs appear to be excellent analogs to high redshift Lyman Break Galaxies (LBGs) and our results may offer additional insight into the dynamics of LBGs. Previous work by our team has shown that the morphologies of these galaxies exhibit tidal features and companions, and in this study we find that the dynamics of ScUVLGs are dominated by disturbed kinematics of the emission line gas-- suggestive that these galaxies have undergone recent feedback, interactions or mergers. While 2 of the 3 galaxies do display rotation, v/sigma < 1 -- suggesting dispersion dominated kinematics rather than smooth rotation. We also simulate how these observations would appear at z~2. Lower resolution and loss of low surface brightness features causes some apparent discrepancies between the low-z (observed) and high-z (simulated) interpretations and quantitatively gives different values for v/sigma, yet simulations of these low-z analogs manage to detect the brightest regions well and resemble actual high-z observations of LBGs.
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