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arXiv 0904.1399astro-ph.CO
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星系团模拟中恒星形成和SuperNovae能量反馈的数值方法

Numerical approaches to star formation and SuperNovae energy feedback in simulations of galaxy clusters

Martina Giovalli

摘要:

这项工作的目标是调查不同的数值方法,并引入一个新的,基于物理的亚网格模型的ISM物理,包括治疗恒星形成和II型超新星能量反馈(MUPPI,多相粒子积分器)。我们的模型遵循ISM物理学,使用一个系统的常微分方程,描述质量和能量流之间的不同的气相在ISM内的每个气体粒子。该模型还包括处理SNe能量转移从恒星形成粒子到他们的邻居。我们将在这篇论文中展示这个模型是如何能够重现所观察到的ISM属性,同时也提供了一个有效的热能反馈和响应的气体,例如交叉的螺旋密度波在星系盘的局部流体动力学性质的变化。我们相信,我们在这里提出的模型将是特别有用的孤立星系和星系团的形成和演化的宇宙学模拟。因此,本博士学位的第一个应用程序。因此,我们的工作将是将MUPPI应用于宇宙学模拟,目的是确定如何改进恒星形成和反馈天体物理过程的处理方法,以影响许多悬而未决的问题,从模拟盘星系的性质到星系团中冷重子(星系和漫射恒星成分)的性质,再到存在有效超新星热反馈时团内介质的性质。

英文摘要:

The goal of this work is to to investigate different numerical approaches and to introduce a new, physically-based sub-grid model for the ISM physics, including a treatment of star formation and Type II supernovae energy feedback (MUPPI, MUlti-Phase Particle Integrator). Our model follows the ISM physics using a system of ordinary differential equations, describing mass and energy flows among the different gas phases in the ISM inside each gas particle. The model also includes the treatment of SNe energy transfer from star-forming particles to their neighbours. We will show in this Thesis how this model is able to reproduce observed ISM properties, while also providing an effective thermal energy feedback and responding to variations in the local hydrodynamical properties of the gas, e.g. crossing of a spiral density wave in a galaxy disk. We believe the model we presented here will be particularly useful in cosmological simulations of formation and evolution of isolated galaxies and galaxy clusters. For this reason, the first application of the present Ph.D. work will therefore be to apply MUPPI to cosmological simulations, with the aim of determine how an improved treatment of star formation and feedback astrophysical processes impacts on many open issues, from the properties of simulated disk galaxies to the properties of cold baryons (galaxies and diffuse stellar component) in galaxy clusters, to the properties of the Intra-Cluster Medium in presence of an effective supernovae thermal feedback.

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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