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arXiv 0902.0566astro-ph.GA
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盘星系合并模拟中恒星质量Tully-Fisher关系的演化

Evolution of the Stellar Mass Tully-Fisher Relation in Disk Galaxy Merger Simulations

M. D. Covington, S. A. Kassin, A. A. Dutton, B. J. Weiner, T. J. Cox, P. Jonsson, J. R. Primack, S. M. Faber, D. C. Koo

摘要:

有一个大的观测散射向低速度的恒星质量塔利-费舍尔关系,如果扰动和紧凑的对象包括在内。然而,如果用$\rm S_{\rm 0.5}$代替旋转速度,则可以消除这种散射,$\rm S_{\rm 0.5}$是一个包括与旋转速度正交的速度色散项的量。在这项工作中,我们使用了一个大型的流体动力学N体星系合并模拟,探索一个可能的机制,创造所观察到的关系。使用模拟观测的模拟,我们测试的观测效果的存在,并探讨$\rm S_{\rm 0.5}$和星系的内在属性之间的关系。我们发现星系合并可以解释TF中的散射以及紧密的$\rm S_{\rm 0.5}$ -恒星质量关系。此外,$\rm S_{\rm 0.5}$与星系的总中心质量相关,包括由于暗物质的贡献。

英文摘要:

There is a large observational scatter toward low velocities in the stellar mass Tully-Fisher relation if disturbed and compact objects are included. However, this scatter can be eliminated if one replaces rotation velocity with $\rm S_{\rm 0.5}$, a quantity that includes a velocity dispersion term added in quadrature with the rotation velocity. In this work we use a large suite of hydrodynamic N-body galaxy merger simulations to explore a possible mechanism for creating the observed relations. Using mock observations of the simulations, we test for the presence of observational effects and explore the relationship between $\rm S_{\rm 0.5}$ and intrinsic properties of the galaxies. We find that galaxy mergers can explain the scatter in the TF as well as the tight $\rm S_{\rm 0.5}$-stellar mass relation. Furthermore, $\rm S_{\rm 0.5}$ is correlated with the total central mass of a galaxy, including contributions due to dark matter.

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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