The Cloud Factory II: gravoturbulent kinematics of resolved molecular clouds in a galactic potential
The Cloud Factory II: gravoturbulent kinematics of resolved molecular clouds in a galactic potential
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云工厂 II:银河势中解析分子云的重力湍流运动学
DOI:
10.1093/mnras/staa3470
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发表时间:
2021
影响因子:
4.8
通讯作者:
Izquierdo A
中科院分区:
文献类型:
--
作者:
Izquierdo A
We present a statistical analysis of the gravoturbulent velocity fluctuations in molecular cloud complexes extracted from our ‘Cloud Factory’ Galactic-scale interstellar medium (ISM) simulation suite. For this purpose, we produce non-local thermodynamic equilibrium12CO J = 1 − 0 synthetic observations and apply the principal component analysis (PCA) reduction technique on a representative sample of cloud complexes. The velocity fluctuations are self-consistently generated by different physical mechanisms at play in our simulations, which include Galactic-scale forces, gas self-gravity, and supernova feedback. The statistical analysis suggests that, even though purely gravitational effects are necessary to reproduce standard observational laws, they are not sufficient in most cases. We show that the extra injection of energy from supernova explosions plays a key role in establishing the global turbulent field and the local dynamics and morphology of molecular clouds. Additionally, we characterize structure function scaling parameters as a result of cloud environmental conditions: some of the complexes are immersed in diffuse (interarm) or dense (spiral-arm) environments, and others are influenced by embedded or external supernovae. In quiescent regions, we obtain time-evolving trajectories of scaling parameters driven by gravitational collapse and supersonic turbulent flows. Our findings suggest that a PCA-based statistical study is a robust method to diagnose the physical mechanisms that drive the gravoturbulent properties of molecular clouds. Also, we present a new open source module, thepcafactory, which smartly performs PCA to extract velocity structure functions from simulated or real data of the ISM in a user-friendly way.
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DOI:
10.1146/annurev.astro.42.053102.134010
发表时间:
2004-03
影响因子:
33.3
作者:
E. Dishoeck
通讯作者:
E. Dishoeck
影响因子:
4.8
作者:
P. Clark;S. Glover;S. Ragan;A. Duarte-Cabral
通讯作者:
P. Clark;S. Glover;S. Ragan;A. Duarte-Cabral
影响因子:
4.8
作者:
Smith R
通讯作者:
Smith R
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
C. Brunt;M. Heyer;E. Vázquez;B. Pichardo
通讯作者:
B. Pichardo
影响因子:
6.5
作者:
K. Immer;M. Reid;K. Menten;A. Brunthaler;T. Dame
通讯作者:
K. Immer;M. Reid;K. Menten;A. Brunthaler;T. Dame