arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.11709astro-ph.GA
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PHANGS CO运动学:150 pc分辨率下的椎间盘方向和旋转曲线

PHANGS CO kinematics: disk orientations and rotation curves at 150 pc resolution

Philipp Lang, Sharon E. Meidt, Erik Rosolowsky, Joseph Nofech, Eva Schinnerer, Adam K. Leroy, Eric Emsellem, Ismael Pessa, Simon C. O. Glover, Brent Groves, Ann… 展开作者

Philipp Lang, Sharon E. Meidt, Erik Rosolowsky, Joseph Nofech, Eva Schinnerer, Adam K. Leroy, Eric Emsellem, Ismael Pessa, Simon C. O. Glover, Brent Groves, Annie Hughes, J. M. Diederik Kruijssen, Miguel Querejeta, Andreas Schruba, Frank Bigiel, Guillermo A. Blanc, Melanie Chevance, Dario Colombo, Christopher Faesi, Jonathan D. Henshaw, Cinthya N. Herrera, Daizhong Liu, Jerome Pety, Johannes Puschnig, Toshiki Saito, Jiayi Sun, Antonio Usero

摘要:

本文给出了PHANGS ALMA观测的67个主序星星系的CO(2-1)运动学定向和高分辨率(150 pc)自转曲线。我们的测量是基于一个新的拟合方法的CO速度场的应用。我们的方法确定了一个最佳的全球方向,以减少影响的非轴对称(酒吧和螺旋)功能和不均匀的空间采样特性的CO排放在附近星系的内部区域。当应用于以1“分辨率绘制的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。拟合这些数据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针。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力学质量示踪剂。从文献中的光度取向和我们的方法确定的运动学取向之间的一致性,我们推断,在log($\rm M_{\star}(M_{\odot})$)=9.0-10.9的质量范围内,我们的样品探测的恒星盘的形状非常接近圆形,具有均匀的厚度。

英文摘要:

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 non-axisymmetric (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($\rm M_{\star}(M_{\odot})$)=9.0-10.9 probed by our sample are very close to circular and have uniform thickness.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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