ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z = 4.8
ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z = 4.8
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DOI：
10.1051/0004-6361/201323331
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发表时间：
2014-04
影响因子：
6.5
通讯作者：
C. Breuck;Rebecca J. Williams;M. Swinbank;P. Caselli;K. Coppin;T. Davis;R. Maiolino;T. Nagao;I. Smail;F. Walter;A. Weiss;M. Zwaan
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文献类型：
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作者：
C. Breuck;Rebecca J. Williams;M. Swinbank;P. Caselli;K. Coppin;T. Davis;R. Maiolino;T. Nagao;I. Smail;F. Walter;A. Weiss;M. Zwaan
我们提出了空间分辨率阿塔卡马大毫米/亚毫米阵列(ALMA)观测z=4.7555亚毫米星系，ALESS73.1。我们的0。��5半高宽图解析了中心靠近活动星系核(AGN)的[CII]发射气体。气体运动学以旋转为主，但具有较高的湍流，VROT/σINT∼3.1，以及整个圆盘的Toomre Q参数。通过对三个独立的薄转盘模型的拟合，我们得到了总的动力学质量为3±2×1010M�。这与以前从CO(2-1)观测得到的分子气体质量相近，并意味着CO到H2的转换因子αCO<；2.3M�(K Km S−1Pc 2)−1。质量预算还将恒星质量限制在<；3.1x1010M�，并需要
We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [Cii] observations of the z = 4.7555 submillimetre galaxy, ALESS 73.1. Our 0. �� 5 FWHM map resolves the [Cii] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, vrot/σint ∼ 3.1, and a Toomre Q parameter <1 throughout the disk. By fitting three independent thin rotating disk models to our data, we derive a total dynamical mass of 3 ± 2 × 10 10 M� . This is close to the molecular gas mass derived from previous CO(2-1) observations, and implies a CO to H2 conversion factor αCO < 2.3 M� (K km s −1 pc 2 ) −1 . The mass budget also constrains the stellar mass to <3.1 × 10 10 M� , and entails a gas fraction of