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arXiv 1709.06647astro-ph.GA
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第一个星系中的尘埃

Dust in the first galaxies

Jason Jaacks, Steven L. Finkelstein, Volker Bromm

摘要:

利用宇宙学体积模拟和一个定制的亚格子模型研究了在宇宙历史的第一个10亿年中由于Pop~III金属富集而导致的第一个星系中的基线尘埃消光。我们发现,虽然最丰富的,高密度的原始星系的视线可以经历一个可测量的量从Pop~III尘埃($E(B-V)_{\rm max}=0.07,\ A_{\rm V,max}\approx0.28$)的消光,平均消光是非常低的$\left< E(B-V) \right> \lesssim 10^{-3}$。我们推导出暗物质晕质量与$E(B-V)\propto M_{\rm halo}^{0.80}$消光之间的幂律关系。通过MonteCarlo参数研究,我们建立了矮星系在高红移处的紫外光谱的基线红化。用这种方法,我们找到了$\left<β_{\rm UV}\right>-2.51\pm0.07$,它几乎是晕质量和红移无关的。

英文摘要:

Using cosmological volume simulations and a custom built sub-grid model for Pop~III star formation, we examine the baseline dust extinction in the first galaxies due to Pop~III metal enrichment in the first billion years of cosmic history. We find that while the most enriched, high-density lines of sight in primordial galaxies can experience a measurable amount of extinction from Pop~III dust ($E(B-V)_{\rm max}=0.07,\ A_{\rm V,max}\approx0.28$), the average extinction is very low with $\left< E(B-V) \right> \lesssim 10^{-3}$. We derive a power-law relationship between dark matter halo mass and extinction of $E(B-V)\propto M_{\rm halo}^{0.80}$. Performing a Monte Carlo parameter study, we establish the baseline reddening of the UV spectra of dwarf galaxies at high redshift due to Pop~III enrichment only. With this method, we find $\left<β_{\rm UV}\right>-2.51\pm0.07$, which is both nearly halo mass and redshift independent.

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