The role of feedback in shaping the structure of the interstellar medium

The role of feedback in shaping the structure of the interstellar medium
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反馈在塑造星际介质结构中的作用

DOI:
10.1093/mnras/stu419
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发表时间:
2014
影响因子:
4.8
通讯作者:
Walker A
Walker A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Walker A

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我们提出了一个分析的作用反馈塑造中性氢(Hi)的模拟盘星系的内容。在我们的分析中,我们使用了两个独立的类银河系盘的两种实现-一个采用保守的反馈方案(麦克马斯特无偏星系巡天),另一个明显更有活力[在宇宙学背景下制造银河系(MaGICC)]。为了量化这些计划的影响,我们生成零阶矩(表面密度)推断的Hidistribution地图;构建与模拟冷星际介质的底层结构相关的功率谱,除了它们的径向表面密度和速度色散分布。我们的研究结果进行了比较,从HiNearby星系调查(事物)的经验数据的平行,自洽的分析。对强反馈(MaGICC)运行的功率谱进行单一幂律拟合(P kγ)(在对应于0.5至0.20 kpc的空间尺度上),得到的斜率与THINGS样本(γ −2.5)中看到的一致。较弱的反馈(MUGS)运行表现出较浅的幂律斜率(γ ε −1.2)。MaGICC模拟的功率谱更一致,尽管是双分量拟合,在更大尺度上功率分布更平坦(即超过102 kpc的尺度为γ π −1.4),在低于101 kpc(γ π −5)的尺度上斜率更陡,定性上与经验声明以及我们早期对矮星盘的工作一致。径向Hissurface密度轮廓的MaGICC光盘显示出明确的指数行为,而那些的MUGS套件基本上是平坦的;这两种行为都遇到了自然界中,虽然的东西样品是更符合我们的更强(MaGICC)的反馈运行。
We present an analysis of the role of feedback in shaping the neutral hydrogen (Hi) content of simulated disc galaxies. For our analysis, we have used two realizations of two separate Milky Way-like (∼L⋆) discs – one employing a conservative feedback scheme (McMaster Unbiased Galaxy Survey), the other significantly more energetic [Making Galaxies In a Cosmological Context (MaGICC)]. To quantify the impact of these schemes, we generate zeroth moment (surface density) maps of the inferred Hidistribution; construct power spectra associated with the underlying structure of the simulated cold interstellar medium, in addition to their radial surface density and velocity dispersion profiles. Our results are compared with a parallel, self-consistent, analysis of empirical data from The HiNearby Galaxy Survey (THINGS). Single power-law fits (P∝kγ) to the power spectra of the stronger feedback (MaGICC) runs (over spatial scales corresponding to ∼0.5 to ∼20 kpc) result in slopes consistent with those seen in the THINGS sample (γ ∼ −2.5). The weaker feedback (MUGS) runs exhibit shallower power-law slopes (γ ∼ −1.2). The power spectra of the MaGICC simulations are more consistent though with a two-component fit, with a flatter distribution of power on larger scales (i.e. γ ∼ −1.4 for scales in excess of ∼2 kpc) and a steeper slope on scales below ∼1 kpc (γ ∼ −5), qualitatively consistent with empirical claims, as well as our earlier work on dwarf discs. The radial Hisurface density profiles of the MaGICC discs show a clear exponential behaviour, while those of the MUGS suite are essentially flat; both behaviours are encountered in nature, although the THINGS sample is more consistent with our stronger (MaGICC) feedback runs.
使用 H i 功率谱分析探测螺旋星系中的星际湍流
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发表时间: 2012
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DOI: 10.1111/j.1365-2966.2011.19450.x
发表时间: 2011
影响因子: 4.8
作者:
K. Pilkington;B. Gibson;F. Calura;A. Brooks;L. Mayer;C. Brook;G. Stinson;R. Thacker;C. G. Few;D. Cunnama;J. Wadsley
通讯作者: J. Wadsley
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DOI: --
发表时间: 2011
期刊:
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作者:
K. Hambleton;B. Gibson;C. Brook;G. Stinson;C. Conselice;J. Bailin;H. Couchman;J. Wadsley
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DOI: 10.1086/319021
发表时间: 2000
期刊: The Astrophysical Journal
影响因子: --
作者:
B. Elmegreen;Sungeun Kim;L. Staveley
通讯作者: L. Staveley