Influence of velocity dispersions on star-formation activities in galaxies

被引：3
作者：
Wang, Tsan-Ming [1 ,2 ,3 ]
Hwang, Chorng-Yuan [3 ]
机构：
[1] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[2] Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
[3] Natl Cent Univ, Grad Inst Astron, 300 Zhongda Rd, Taoyuan 320, Taiwan
来源：
ASTRONOMY & ASTROPHYSICS | 2020年 / 641卷
基金：
美国国家航空航天局; 美国国家科学基金会;
关键词：
galaxies: spiral; galaxies: star formation; galaxies: ISM; NEARBY GALAXIES; MOLECULAR CLOUDS; MAGNETIC-FIELDS; SPIRAL GALAXIES; SCHMIDT LAW; H-I; GAS; TURBULENCE; KINEMATICS; EVOLUTION;
D O I：
10.1051/0004-6361/202037748
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigated the influence of the random velocity of molecular gas on star-formation activities of six nearby galaxies. The physical properties of a molecular cloud, such as temperature and density, influence star-formation activities in the cloud. Additionally, local and turbulent motions of molecules in a cloud may exert substantial pressure on gravitational collapse and thus prevent or reduce star formation in the cloud. However, the influence of gas motion on star-formation activities remains poorly understood. We used data from the Atacama Large Millimeter/submillimeter Array to obtain (CO)-C-12(J=1-0) flux and velocity dispersion. We then combined these data with 3.6 and 8 micron midinfrared data from the Spitzer Space Telescope to evaluate the effects of gas motion on star-formation activities in several nearby galaxies. We discovered that relatively high velocity dispersion in molecular clouds corresponds with relatively low star-formation activity. Considering the velocity dispersion as an additional parameter, we derived a modified Kennicutt-Schmidt law with a gas surface density power index of 0.84 and velocity dispersion power index of -0.61.
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页数：11
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