Turbulence in Giant Molecular Clouds: The effect of photoionisation feedback

Turbulence in Giant Molecular Clouds: The effect of photoionisation feedback
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巨型分子云中的湍流:光电离反馈的影响

DOI:
10.1093/mnras/stu2498
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发表时间:
2014
期刊:
arXiv: Astrophysics of Galaxies
影响因子:
--
通讯作者:
Barbara Ercolano
Barbara Ercolano
中科院分区:
--
文献类型:
--
作者:
D. M. Boneberg;James E. Dale;P. Girichidis;Barbara Ercolano

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巨分子云(GMC)被观察到是湍流的,但理论表明,如果没有驱动机制,湍流应该很快衰减。问题是,湍流是由什么机制驱动或维持的。已经表明,来自大质量恒星的光电离反馈对周围的GMC有影响,例如可以产生巨大的HII气泡。因此,我们解决的问题,是否湍流是一个后果,这种效果的反馈云。为了研究这一点,我们分析了模拟的高质量星星形成区的速度场,通过研究速度结构函数和功率谱。我们发现,云的形态受到强烈影响的光电离反馈也显示出证据的驱动湍流通过保存或恢复Kolmogorov型速度场。相反,没有光电离反馈的控制运行模拟具有带有引力坍缩和能量耗散特征的速度分布,其中初始科尔莫戈罗夫型结构函数被删除。
Giant Molecular Clouds (GMCs) are observed to be turbulent, but theory shows that without a driving mechanism turbulence should quickly decay. The question arises by which mechanisms turbulence is driven or sustained. It has been shown that photoionising feedback from massive stars has an impact on the surrounding GMC and can for example create vast HII bubbles. We therefore address the question of whether turbulence is a consequence of this effect of feedback on the cloud. To investigate this, we analyse the velocity field of simulations of high mass star forming regions by studying velocity structure functions and power spectra. We find that clouds whose morphology is strongly affected by photoionising feedback also show evidence of driving of turbulence by preserving or recovering a Kolmogorov-type velocity field. On the contrary, control run simulations without photoionising feedback have a velocity distribution that bears the signature of gravitational collapse and of the dissipation of energy, where the initial Kolmogorov-type structure function is erased.
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