Dust-obscured star-forming galaxies in the early universe
Dust-obscured star-forming galaxies in the early universe
复制标题
DOI：
10.1093/mnras/stx2588
复制
发表时间：
2017-10
影响因子：
4.8
通讯作者：
S. Wilkins;Yu Feng;T. Matteo;R. Croft;C. Lovell;P. Thomas
中科院分区：
文献类型：
--
作者：
S. Wilkins;Yu Feng;T. Matteo;R. Croft;C. Lovell;P. Thomas
受最近在z∼6及以上恒星形成星系中尘埃再处理辐射的观测限制，我们使用非常大的宇宙流体动力学模拟BLUETIDES来探索对早期宇宙(z>；8)尘埃遮挡恒星形成数量的预测。BLUETIDES匹配了目前对UV光度函数和星系恒星质量函数的观测约束，并预测在z=8的高质量(M*>；1010M⊙)星系中，大约90%的恒星形成已经被尘埃遮蔽。BLUETIDES预报的尘埃衰减与恒星质量之间的关系与在低红移时观测到的一致。然而，在z>；6对几个单独天体的观测与预测不一致，尽管它们的不确定性可能被低估了。我们发现，预测的z≥8亚毫米源的表面密度低于目前赫歇尔、Scuba-2和阿塔卡马大毫米阵列亚毫米源的探测结果。然而，随着ALMA继续积累更多的表面积，Z>；8被尘埃遮挡的星系的数量可能在不久的将来变得可访问。
Motivated by recent observational constraints on dust reprocessed emission in star-forming galaxies at z ∼ 6 and above, we use the very large cosmological hydrodynamical simulation BLUETIDES to explore predictions for the amount of dust-obscured star formation in the early Universe (z > 8). BLUETIDES matches current observational constraints on both the UV luminosity function and galaxy stellar mass function and predicts that approximately 90 per cent of the star formation in high-mass (M* > 1010 M⊙) galaxies at z = 8 is already obscured by dust. The relationship between dust attenuation and stellar mass predicted by BLUETIDES is consistent with that observed at lower redshift. However, observations of several individual objects at z > 6 are discrepant with the predictions, though it is possible that their uncertainties may have been underestimated. We find that the predicted surface density of z ≥ 8 submm sources is below that accessible to current Herschel, SCUBA-2 and Atacama Large Millimetre Array (ALMA) submm surveys. However, as ALMA continues to accrue an additional surface area the population of z > 8 dust-obscured galaxies may become accessible in the near future.