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arXiv 1202.6400astro-ph.GA
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RAMSES-CH:一个新的用于宇宙学模拟的化学动力学程序

RAMSES-CH: A New Chemodynamical Code for Cosmological Simulations

C. Gareth Few, Stephanie Courty, Brad K. Gibson, Daisuke Kawata, Francesco Calura, Romain Teyssier

摘要:

我们提出了一个新的化学动力学代码- Ramses-CH -用于在完全宇宙学框架内模拟星系的化学和流体动力学性质的自洽演化。我们建立在自适应网格细化代码拉美西斯,其中包括治疗的自重,流体力学,恒星形成,辐射冷却,和超新星反馈,跟踪占主导地位的同位素的C,N,O,Ne,Mg,Si和Fe。我们包括Ia型和II型超新星的贡献,除了低和中等质量的渐近巨星分支星,放松瞬时回收近似。新的化学演化模块是高度灵活和便携式的,有助于随时探索基础恒星和核物理的变化。我们将Ramses-CH应用于一个典型L* 星系的宇宙学模拟,成功地恢复了关于[α/Fe]-[Fe/H]和Ia/II型超新星速率的基本经验约束。

英文摘要:

We present a new chemodynamical code - Ramses-CH - for use in simulating the self-consistent evolution of chemical and hydrodynamical properties of galaxies within a fully cosmological framework. We build upon the adaptive mesh refinement code Ramses, which includes a treatment of self-gravity, hydrodynamics, star formation, radiative cooling, and supernovae feedback, to trace the dominant isotopes of C, N, O, Ne, Mg, Si, and Fe. We include the contribution of Type Ia and II supernovae, in addition to low- and intermediate-mass asymptotic giant branch stars, relaxing the instantaneous recycling approximation. The new chemical evolution modules are highly flexible and portable, lending themselves to ready exploration of variations in the underpining stellar and nuclear physics. We apply Ramses-CH to the cosmological simulation of a typical L* galaxy, demonstrating the successful recovery of the basic empirical constraints regarding, [α/Fe]-[Fe/H] and Type Ia/II supernovae rates.

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