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arXiv 2109.08387astro-ph.GA
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御夫座模拟中暗条对矮星系性质的影响

The impact of filaments on dwarf galaxy properties in the Auriga simulations

Haonan Zheng, Shihong Liao, Jia Hu, Liang Gao, Robert J. J. Grand, Qing Gu, Qi Guo

摘要:

通过一个简单的不考虑反馈的星系形成模型的流体动力学模拟,我们以前的工作表明,在高红移的密集和大量的细丝可以提供潜在的阱来捕获和压缩气体,从而影响星系形成在其居住的低质量晕。在本文中,我们利用御夫座模拟,一套高分辨率的放大银河系类星系的流体动力学模拟,研究是否仍然成立的结论在模拟与复杂的星系形成模型。与我们以前的工作结果一致,我们发现,与具有相似晕质量的暗条星系相比,存在于暗条中的矮星系往往具有更高的重子和恒星分数。在固定的母晕质量下,暗条矮星的恒星形成率往往比场矮星略高。但总的来说,我们没有发现暗条和场的星系颜色有明显的差别。我们还表明,在高红移,在矮星系的气体成分往往有他们的自旋与他们居住的细丝对齐。我们的研究结果支持了这样一种观点,即在高红移的大质量暗条有助于气体吸积,并增强了其驻留的矮尺寸暗物质晕中的恒星形成。

英文摘要:

With a hydrodynamical simulation using a simple galaxy formation model without taking into account feedback, our previous work has shown that dense and massive filaments at high redshift can provide potential wells to trap and compress gas, and hence affect galaxy formation in their resident low-mass haloes. In this paper, we make use of the Auriga simulations, a suite of high-resolution zoom-in hydrodynamical simulations of Milky Way-like galaxies, to study whether the conclusion still holds in the simulations with a sophisticated galaxy formation model. In agreement with the results of our previous work, we find that, comparing to their counterparts with similar halo masses in field, dwarf galaxies residing in filaments tend to have higher baryonic and stellar fractions. At the fixed parent halo mass, the filament dwarfs tend to have slightly higher star formation rates than those of field ones. But overall we do not find a clear difference in galaxy g - r colours between the filament and field populations. We also show that at high redshifts, the gas components in dwarf galaxies tend to have their spins aligned with the filaments in which they reside. Our results support a picture in which massive filaments at high redshift assist gas accretion and enhance star formation in their resident dwarf sized dark matter haloes.

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