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arXiv 1409.4425astro-ph.GAastro-ph.CO
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非均匀星际介质中的超新星反馈

Supernova Feedback in an Inhomogeneous Interstellar Medium

Davide Martizzi, Claude-Andre Faucher-Giguere, Eliot Quataert

摘要:

超新星反馈是形成星系星际介质的关键过程之一。SNe有助于(在某些情况下可能占主导地位)驱动ISM中的湍流和加速银河风。现代宇宙学模拟有足够的分辨率来捕捉星系ISM中的主要结构,但通常仍然无法明确解决所有的小尺度恒星反馈过程,包括超新星遗迹(SNRs)的膨胀。我们进行了一系列的控制三维流体动力学(自适应网格细化)模拟的单个SNR扩展在一个不均匀的密度场与统计的湍流ISM的动机。我们用这些来量化的动量和热能注入SNe作为空间尺度和密度,金属丰度和周围介质的结构的函数。我们开发了一系列的分析公式,我们适合模拟。这些公式可以作为一个更有预测性的亚分辨率模型的基础上SN反馈星系形成模拟。然后,我们使用多个,随机驱动的SNE,解决SNR的关键阶段的模拟测试的次分辨率模型,并表明它准确地捕捉湍流动能和热能在ISM。相比之下,在文献中提出的SN反馈模型的基础上“延迟冷却”显着overpredict晚的时间热能和动量的SNR。

英文摘要:

Supernova (SN) feedback is one of the key processes shaping the interstellar medium (ISM) of galaxies. SNe contribute to (and in some cases may dominate) driving turbulence in the ISM and accelerating galactic winds. Modern cosmological simulations have sufficient resolution to capture the main structures in the ISM of galaxies, but are typically still not capable of explicitly resolving all of the small-scale stellar feedback processes, including the expansion of supernova remnants (SNRs). We perform a series of controlled three-dimensional hydrodynamic (adaptive mesh refinement) simulations of single SNRs expanding in an inhomogeneous density field with statistics motivated by those of the turbulent ISM. We use these to quantify the momentum and thermal energy injection from SNe as a function of spatial scale and the density, metallicity, and structure of the ambient medium. We develop a series of analytic formulae that we fit to the simulations. These formulae can be used as a basis for a more predictive sub-resolution model for SN feedback for galaxy formation simulations. We then use simulations of multiple, stochastically driven SNe that resolve the key phases of SNRs to test the sub-resolution model, and show that it accurately captures the turbulent kinetic energy and thermal energy in the ISM. By contrast, proposed SN feedback models in the literature based on `delayed cooling' significantly overpredict the late-time thermal energy and momentum in SNRs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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