PHANGS CO Kinematics: Disk Orientations and Rotation Curves at 150 pc Resolution
PHANGS CO Kinematics: Disk Orientations and Rotation Curves at 150 pc Resolution
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DOI：
10.3847/1538-4357/ab9953
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发表时间：
2020-05
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通讯作者：
P. Lang;S. Meidt;E. Rosolowsky;Joseph Nofech;E. Schinnerer;A. Leroy;E. Emsellem;E. Emsellem;I. Pessa;S. Glover;B. Groves;A. Hughes;J. Kruijssen;M. Querejeta;A. Schruba;F. Bigiel;G. Blanc;G. Blanc;M. Chevance;D. Colombo;C. Faesi;J. Henshaw;C. Herrera;Daizhong Liu;J. Pety;J. Puschnig;T. Saito;Jiayi Sun;A. Usero
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作者：
P. Lang;S. Meidt;E. Rosolowsky;Joseph Nofech;E. Schinnerer;A. Leroy;E. Emsellem;E. Emsellem;I. Pessa;S. Glover;B. Groves;A. Hughes;J. Kruijssen;M. Querejeta;A. Schruba;F. Bigiel;G. Blanc;G. Blanc;M. Chevance;D. Colombo;C. Faesi;J. Henshaw;C. Herrera;Daizhong Liu;J. Pety;J. Puschnig;T. Saito;Jiayi Sun;A. Usero
我们提出了由PHANGS-ALMA在CO（2-1）发射中观测的67个主序星形成星系的运动学方向和高分辨率（150 pc）旋转曲线。我们的测量是基于一种新的适合CO速度场的拟合方法的应用。我们的方法确定了一个最佳的全局方向，以减少非轴对称（条形和螺旋形）特征的影响，以及附近星系内部区域CO发射的不均匀空间采样特征。当应用于1″分辨率的PHANGS CO速度场中包含的大量独立视线时，该方法表现得特别好。与这些数据相匹配的高分辨率旋转曲线是这些星系内部区域质量分布的敏感探测器。我们使用内斜率以及我们拟合的旋转曲线的振幅来证明CO是一个可靠的全球动态质量示踪剂。根据文献的光度取向与我们的方法确定的运动学取向的一致性，我们推断，我们的样本探测到的质量范围为log() = 9.0-10.9的恒星盘的形状非常接近圆形，厚度均匀。
We present kinematic orientations and high-resolution (150 pc) rotation curves for 67 main-sequence star-forming galaxies surveyed in CO (2–1) emission by PHANGS–ALMA. Our measurements are based on the application of a new fitting method tailored to CO velocity fields. Our approach identifies an optimal global orientation as a way to reduce the impact of nonaxisymmetric (bar and spiral) features and the uneven spatial sampling characteristic of CO emission in the inner regions of nearby galaxies. The method performs especially well when applied to the large number of independent lines of sight contained in the PHANGS CO velocity fields mapped at 1″ resolution. The high-resolution rotation curves fitted to these data are sensitive probes of mass distribution in the inner regions of these galaxies. We use the inner slope as well as the amplitude of our fitted rotation curves to demonstrate that CO is a reliable global dynamical mass tracer. From the consistency between photometric orientations from the literature and kinematic orientations determined with our method, we infer that the shapes of stellar disks in the mass range of log( ) = 9.0–10.9 probed by our sample are very close to circular and have uniform thickness.