An ALMA survey of the SCUBA-2 CLS UDS field: physical properties of 707 sub-millimetre galaxies
An ALMA survey of the SCUBA-2 CLS UDS field: physical properties of 707 sub-millimetre galaxies
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DOI：
10.1093/mnras/staa769
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发表时间：
2019-10
影响因子：
4.8
通讯作者：
U. Dudzevivciut.e;I. Smail;A. Swinbank;S. Stach;O. Almaini;E. D. Cunha;F. An;V. Arumugam;
中科院分区：
文献类型：
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作者：
U. Dudzevivciut.e;I. Smail;A. Swinbank;S. Stach;O. Almaini;E. D. Cunha;F. An;V. Arumugam;
我们分析了一个大的，均匀选择的样本ALMA位于亚毫米星系（SMG）的物理特性。这项调查，AS 2UDS，确定了707 SMG在101 deg 2领域，其中包括1017%，这是未检测到的K 1025.7马格。我们解释了他们的紫外线到无线电数据使用magphys和确定的中值红移z = 2.61 ± 0.08（1σ范围z = 1.8-3.4），只有106%在z > 4。我们的巡天观测提供了一个z = 1的大质量尘埃星系样本，尘埃和恒星质量的中值为Md =（6.8 ± 0.3）× 108 M <$（因此，气体质量为1011 M <$），M* =（1.26 ± 0.05）× 1011 M <$。我们发现，在z = 1.5-4的远红外光度不变的情况下，尘埃温度没有变化。我们的样品的气体质量函数增加到z = 2-3，然后在z > 3时下降。SMG的空间密度和质量表明，几乎所有M* 103 × 1011 M的星系都经历了类似SMG的阶段。红移分布与晕中气体组分的演化和晕质量的增长相结合的模型很好地拟合，因此SMG可能代表了富气质量晕的高效坍缩。我们表明，SMG是广泛一致的简单的同源系统在远红外线，一致的中央照明星爆。我们的研究为z > 1的活跃的、富含气体的SMG人口与宇宙历史上大质量、以膨胀为主的星系的形成之间的进化联系提供了强有力的支持。
We analyse the physical properties of a large, homogeneously selected sample of ALMA-located sub-millimetre galaxies (SMGs). This survey, AS2UDS, identified 707 SMGs across the ∼1 deg2 field, including ∼17 per cent, which are undetected at K ≳ 25.7 mag. We interpret their ultraviolet-to-radio data using magphys and determine a median redshift of z = 2.61 ± 0.08 (1σ range of z = 1.8–3.4) with just ∼6 per cent at z > 4. Our survey provides a sample of massive dusty galaxies at z ≳ 1, with median dust and stellar masses of Md = (6.8 ± 0.3) × 108 M⊙ (thus, gas masses of ∼1011 M⊙) and M* = (1.26 ± 0.05) × 1011 M⊙. We find no evolution in dust temperature at a constant far-infrared luminosity across z ∼ 1.5–4. The gas mass function of our sample increases to z ∼ 2–3 and then declines at z > 3. The space density and masses of SMGs suggest that almost all galaxies with M* ≳ 3 × 1011 M⊙ have passed through an SMG-like phase. The redshift distribution is well fit by a model combining evolution of the gas fraction in haloes with the growth of halo mass past a critical threshold of Mh ∼ 6 × 1012 M⊙, thus SMGs may represent the highly efficient collapse of gas-rich massive haloes. We show that SMGs are broadly consistent with simple homologous systems in the far-infrared, consistent with a centrally illuminated starburst. Our study provides strong support for an evolutionary link between the active, gas-rich SMG population at z > 1 and the formation of massive, bulge-dominated galaxies across the history of the Universe.