The properties of the first galaxies in the BlueTides simulation

The properties of the first galaxies in the BlueTides simulation
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BlueTides 模拟中第一个星系的属性

DOI:
10.1093/mnras/stx841
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发表时间:
2017
影响因子:
4.8
通讯作者:
Wilkins S
Wilkins S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wilkins S

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我们利用超大型宇宙流体动力学模拟BlueTides研究了再电离时期(z> 8)星系人口的预测性质。蓝潮的分辨率和体积((400/h 577)3cMpc 3)提供了一个星系群,与目前针对高红移宇宙的观测调查的深度和面积很好地匹配。在Atz= 8时,蓝潮包括近160000个恒星质量> 108 M <$.的星系。BlueTides预测的星系数量与星系恒星质量函数和远紫外(150 nm)光度函数的观测约束非常匹配。蓝潮中的星系以快速增加的星星形成历史为特征。特定的星星形成率随红移而降低,但对恒星质量基本不敏感。由于金属表面密度的增加,预计质量更大的星系会有更高的尘埃衰减,导致在高光度下观测到的远紫外光度函数显著变陡。活跃的超大质量黑洞(SMBH)对恒星质量为109- 10 M的星系的紫外光度的贡献平均约为3%。预计大约25%的M *≈ 1010 M ⊙的星系具有活跃的SMBH,贡献了总紫外光度的10%以上。
We employ the very large cosmological hydrodynamical simulation BlueTides to investigate the predicted properties of the galaxy population during the epoch of reionization (z> 8). BlueTides has a resolution and volume ((400/h≈ 577)3cMpc3) providing a population of galaxies that is well matched to depth and area of current observational surveys targeting the high-redshift Universe. Atz= 8, BlueTides includes almost 160 000 galaxies with stellar masses >108M⊙. The population of galaxies predicted by BlueTides closely matches observational constraints on both the galaxy stellar mass function and far-UV (150 nm) luminosity function. Galaxies in BlueTides are characterized by rapidly increasing star formation histories. Specific star formation rates decrease with redshift though remain largely insensitive to stellar mass. As a result of the enhanced surface density of metals, more massive galaxies are predicted to have higher dust attenuation resulting in a significant steepening of the observed far-UV luminosity function at high luminosities. The contribution of active supermassive black holes (SMBHs) to the UV luminosities of galaxies with stellar masses 109–10M⊙is around 3 per cent on average. Approximately 25 per cent of galaxies withM*≈ 1010M⊙are predicted to have active SMBHs that contribute >10 per cent of the total UV luminosity.
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发表时间: 2013
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通讯作者: Australia.
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发表时间: 2011
期刊: The Astrophysical Journal
影响因子: --
作者:
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