期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 493, 期 4, 页码 5045-5061出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa556
关键词
ISM: clouds; galaxies: individual: NGC1300; galaxies: star formation
资金
- Japan Society of the Promotion of Science (JSPS)
- JSPS [16K05294, 19K03928]
- JSPS KAKENHI [JP19K03923]
- Grants-in-Aid for Scientific Research [19K03928, 16K05294] Funding Source: KAKEN
Star formation activity depends on galactic-scale environments. To understand the variations in star formation activity, comparing the properties of giant molecular clouds (GMCs) among environments with different star formation efficiency (SFE) is necessary. We thus focus on a strongly barred galaxy to investigate the impact of the galactic environment on the GMC properties, because the SFE is clearly lower in bar regions than in arm regions. In this paper, we present the (CO)-C-12(1 - 0) observations towards the western bar, arm, and bar-end regions of the strongly barred galaxy NGC 1300 with ALMA 12-m array at a high angular resolution of similar to 40 pc. We detected GMCs associated with the dark lanes not only in the arm and barend regions but also in the bar region, where massive star formation is not seen. Using the CPROPS algorithm, we identified and characterized 233 GMCs across the observed regions. Based on the Kolmogorov-Smirnov test, we find that there is virtually no significant variations in GMC properties (e.g. radius, velocity dispersion, molecular gas mass, and virial parameter) among the bar, arm, and bar-end region. These results suggest that systematic differences in the physical properties of the GMCs are not the cause for SFE differences with environments, and that there should be other mechanisms which control the SFE of the GMCs such as fast cloud-cloud collisions in NGC 1300.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据