GIANT MOLECULAR CLOUD FORMATION IN DISK GALAXIES: CHARACTERIZING SIMULATED VERSUS OBSERVED CLOUD CATALOGS
GIANT MOLECULAR CLOUD FORMATION IN DISK GALAXIES: CHARACTERIZING SIMULATED VERSUS OBSERVED CLOUD CATALOGS
复制标题
盘状星系中巨型分子云的形成：表征模拟与观测的云目录
DOI：
10.1088/0004-637x/776/1/23
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
J. Wadsley
中科院分区：
文献类型：
--
作者：
S. Benincasa;E. Tasker;R. Pudritz;J. Wadsley
我们提出了一个模拟巨大分子云（GMCs）的研究结果，它形成于一个具有平坦旋转曲线的银河系型星系盘中。这个模拟，不包括恒星形成或反馈，产生质量在104 M☉到107 M☉之间的云。我们将模拟的云群与两个观测调查进行了比较：波士顿大学-五学院射电天文台银河环调查和BIMA对M33的全盘调查。对全局云特性进行了分析，并对Larson尺度关系进行了比较。我们发现模拟的云的性质与观测到的云的性质非常吻合，在M33中，在相当的分辨率下，云的性质最吻合。我们的云是高度丝状的——这种特性既源于它们在剪切星系环境中的引力不稳定，也源于云与云之间的引力相遇。我们还发现，在密集区域（其中nthresh大于或等于104 cm−3）内，潜在的恒星形成气体积聚的速率是每10 Myr 3%，在大约106 M☉的云层中。这表明，在观测到的云中，恒星的形成速率与气体可以通过丝状流积聚到gmc内密集亚区域的速率有关。在模拟gmc的目录中，选择了内部分辨率最高的云，这是第一次。编目的云作为从全局模拟中提取的数据集可用。
We present the results of a study of simulated giant molecular clouds (GMCs) formed in a Milky Way–type galactic disk with a flat rotation curve. This simulation, which does not include star formation or feedback, produces clouds with masses ranging between 104 M☉ and 107 M☉. We compare our simulated cloud population to two observational surveys: the Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey and the BIMA All-Disk Survey of M33. An analysis of the global cloud properties as well as a comparison of Larson's scaling relations is carried out. We find that simulated cloud properties agree well with the observed cloud properties, with the closest agreement occurring between the clouds at comparable resolution in M33. Our clouds are highly filamentary—a property that derives both from their formation due to gravitational instability in the sheared galactic environment, as well as to cloud–cloud gravitational encounters. We also find that the rate at which potentially star-forming gas accumulates within dense regions—wherein nthresh ⩾ 104 cm−3—is 3% per 10 Myr, in clouds of roughly 106 M☉. This suggests that star formation rates in observed clouds are related to the rates at which gas can be accumulated into dense subregions within GMCs via filamentary flows. The most internally well-resolved clouds are chosen for listing in a catalog of simulated GMCs—the first of its kind. The cataloged clouds are available as an extracted data set from the global simulation.
自重力气体 (M)HD 模拟的新 Jean 分辨率准则：在重力驱动湍流磁场放大中的应用
DOI：
10.1088/0004-637x/731/1/62
发表时间：
2011
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Christoph Federrath;Sharanya Sur;Dominik R. G Schleicher;Robi Banerjee;Ralf S. Klessen
通讯作者：
Ralf S. Klessen