The impact of stellar feedback on the density and velocity structure of the interstellar medium
The impact of stellar feedback on the density and velocity structure of the interstellar medium
复制标题
恒星反馈对星际介质密度和速度结构的影响
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
J. Read
中科院分区：
文献类型：
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作者：
K. Grisdale;O. Agertz;A. Romeo;F. Renaud;J. Read
研究了恒星反馈对盘星系中性氢密度和速度结构的影响。对于我们的分析，我们进行了4.6 pc分辨率N体+自适应网格细化孤立星系的流体动力学模拟，设置模仿银河系和大小麦哲伦云。我们量化的星际介质的密度和速度结构，使用功率谱和比较模拟的星系观察到的H I在本地的螺旋星系的东西（H I附近的星系调查）。我们的模型与恒星反馈给观察到的东西H I密度功率谱的一个很好的匹配。我们发现，在反馈调节星系的动能功率谱，无论星系的质量和大小，显示出标度与超音速湍流（E（k）k−2）在低于H I层厚度的尺度上非常一致。我们发现，反馈影响的气体密度场，并驱动气体湍流，大（kpc）尺度。这与大规模重力驱动湍流产生的密度场形成鲜明对比。我们的结论是中性气体含量的星系进行签名的恒星反馈的所有尺度。
We study the impact of stellar feedback in shaping the density and velocity structure of neutral hydrogen (H I) in disc galaxies. For our analysis, we carry out ∼4.6 pc resolution N-body+adaptive mesh refinement hydrodynamic simulations of isolated galaxies, set up to mimic a Milky Way and a Large and Small Magellanic Cloud. We quantify the density and velocity structure of the interstellar medium using power spectra and compare the simulated galaxies to observed H I in local spiral galaxies from THINGS (The H I Nearby Galaxy Survey). Our models with stellar feedback give an excellent match to the observed THINGS H I density power spectra. We find that kinetic energy power spectra in feedback-regulated galaxies, regardless of galaxy mass and size, show scalings in excellent agreement with supersonic turbulence (E(k) ∝ k−2) on scales below the thickness of the H I layer. We show that feedback influences the gas density field, and drives gas turbulence, up to large (kpc) scales. This is in stark contrast to density fields generated by large-scale gravity-only driven turbulence. We conclude that the neutral gas content of galaxies carries signatures of stellar feedback on all scales.
影响因子：
4.8
作者：
Walker A
通讯作者：
Walker A
影响因子：
4.9
作者：
Agertz, Oscar;Kravtsov, Andrey V.
通讯作者：
Kravtsov, Andrey V.