Connection among environment, cloud–cloud collision speed, and star formation activity in the strongly barred galaxy NGC 1300
Connection among environment, cloud–cloud collision speed, and star formation activity in the strongly barred galaxy NGC 1300
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强棒星系 NGC 1300 中环境、云与云碰撞速度和恒星形成活动之间的联系
DOI:
10.1093/mnras/stab130
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
A. Habe
中科院分区:
文献类型:
--
作者:
F. Maeda;K. Ohta;Y. Fujimoto;A. Habe
Cloud–cloud collision (CCC) has been suggested as a mechanism to induce massive star formation. Recent simulations suggest that a CCC speed is different among galactic-scale environments, which is responsible for observed differences in star formation activity. In particular, a high-speed CCC is proposed as a cause of star formation suppression in the bar regions in barred spiral galaxies. Focusing on the strongly barred galaxy NGC 1300, we investigate the CCC speed. We find the CCC speed in the bar and bar-end tend to be higher than that in the arm. The estimated CCC speed is ∼ 20 km s−1, ∼ 16 km s−1, and ∼ 11 km s−1 in the bar, bar-end, and arm, respectively. Although the star formation activity is different in the bar and bar-end, the CCC speed and the number density of high-speed CCC with > 20 km s−1 are high in both regions, implying the existence of other parameters that control the star formation. The difference in molecular gas mass (average density) of the giant molecular clouds (GMCs) between the bar (lower mass and lower density) and bar-end (higher mass and higher density) may be cause for the different star formation activity. Combining with our previous study (Maeda et al.), the leading candidates of causes for the star formation suppression in the bar in NGC 1300 are the presence of a large amount of diffuse molecular gases and high-speed CCCs between low mass GMCs.
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影响因子:
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DOI:
10.1088/0004-637x/784/1/3
发表时间:
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期刊:
The Astrophysical Journal
影响因子:
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DOI:
10.3847/1538-4357/ab9953
发表时间:
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期刊:
The Astrophysical Journal
影响因子:
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