Sub-mm Galaxies in Cosmological Hydrodynamics Simulations
Sub-mm Galaxies in Cosmological Hydrodynamics Simulations
复制标题
宇宙流体动力学模拟中的亚毫米星系
DOI：
10.1111/j.1365-2966.2012.22107.x
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
清水一紘,吉田直紀,岡本崇
中科院分区：
文献类型：
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作者：
Daisuke YONETOKU;et al;清水一紘,吉田直紀,岡本崇
我们使用大型宇宙平滑粒子流体动力学模拟来研究亚毫米星系（smg）的形成和演化。在我们之前的工作中，我们研究了紫外线选择的恒星形成星系在高红移的统计特性。我们通过计算尘埃颗粒对恒星光的再处理，以自一致的方式进入远红外到毫米波段，用smg填充相同的宇宙学模拟。我们产生光锥输出，直接比较模拟的smg与现有观测的统计特性。我们的模型再现了亚毫米源数计数和聚类振幅。我们发现，通量为>.1 mJy的明亮smg位于质量为~ 1013M⊙的光晕中，恒星质量大于1011M⊙。smg和Lyman α发射体之间的角相互关系明显弱于smg和Lyman-break星系之间的角相互关系。smg的互相关也弱于自相关。smg的红移分布显示出一个宽峰atz ~ 2，其中明亮的smg对全球宇宙恒星形成速率密度有显著贡献。我们的模型预测，有数百个smg，每1°2场有5个>，每1°2场有5个>。这样的smg可以被ALMA探测到。
We use large cosmological smoothed particle hydrodynamics simulations to study the formation and evolution of submillimetre galaxies (SMGs). In our previous work, we studied the statistical properties of ultraviolet-selected star-forming galaxies at high redshifts. We populate the same cosmological simulations with SMGs by calculating the reprocessing of stellar light by dust grains into far-infrared to millimetre wavebands in a self-consistent manner. We generate light-cone outputs to compare directly the statistical properties of the simulated SMGs with available observations. Our model reproduces the submillimetre source number counts and the clustering amplitude. We show that bright SMGs with fluxS> 1 mJy reside in haloes with masses of ∼1013M⊙and have stellar masses greater than 1011M⊙. The angular cross-correlation between the SMGs and Lyman α emitters is significantly weaker than that between the SMGs and Lyman-break galaxies. The cross-correlation is also weaker than the autocorrelation of the SMGs. The redshift distribution of the SMGs shows a broad peak atz∼ 2, where bright SMGs contribute significantly to the global cosmic star formation rate density. Our model predicts that there are hundreds of SMGs withS> 0.1 mJy atz> 5 per 1 deg2field. Such SMGs can be detected by ALMA.