论文标题

Alma 26 Arcmin $^2 $在一毫米计(Asagao)的商品-S调查:恒星质量的毫米属性选择星系

ALMA 26 arcmin$^2$ survey of GOODS-S at one-millimeter (ASAGAO): millimeter properties of stellar mass selected galaxies

论文作者

Yamaguchi, Y., Kohno, K., Hatsukade, B., Wang, T., Yoshimura, Y., Ao, Y., Dunlop, J. S., Egami, E., Espada, D., Fujimoto, S., Hayatsu, N. H., Ivison, R. J., Kodama, T., Kusakabe, H., Nagao, T., Ouchi, M., Rujopakarn, W., Tadaki, K., Tamura, Y., Ueda, Y., Umehata, H., Wang, W. -H.

论文摘要

我们利用Asagao,深1.2毫米的连续观测,对使用ALMA获得的商品南部领域中的26 Arcmin $^2 $区域进行探测,以探测从Zfourge Catalog中绘制的$ K $ band(即$ K $ band)中的灰尘刺激的星形构造(即精选的星系)星系。基于Asagao组合地图,该地图是通过在商品南部领域结合Asagao和Alma档案数据来创建的,我们发现24个Zfourge源具有1.2毫米的对应物,其信号含量$> $> $> $> $ 4.5(1 $σ\ simeq $ 30-70-70 $ 30-70 $ $ jy $ jy $ jy $ jy $ $ $ $ $^$^{-1} $ at。他们的中间红移估计为$ z_ \ mathrm {中位数} = $ 2.38 $ \ pm $ 0.14。它们通常遵循恒星质量与恒星形成率的紧密关系(即星形星系的主要序列)。与没有ALMA检测的Zfourge星系相比,ALMA检测到的Zfourge源表现出更大的红外(IR)过量(IRX $ \ equiv l_ \ Mathrm {ir}/l_ \ Mathrm {uv} $),即使没有ALMA检测到Zfourge Galaxies,即这意味着共识的恒星质量与IRX关系,在静止框架选择的星系中已知,这是紧密的,无法完全预测恒星质量选择的星系的ALMA可检测性。我们发现,ALMA检测的Zfourge来源是$ Z $ = 2-3的宇宙IR星形形成率密度的主要贡献者。

We make use of the ASAGAO, deep 1.2 mm continuum observations of a 26 arcmin$^2$ region in the GOODS-South field obtained with ALMA, to probe dust-enshrouded star formation in $K$-band selected (i.e., stellar mass selected) galaxies, which are drawn from the ZFOURGE catalog. Based on the ASAGAO combined map, which was created by combining ASAGAO and ALMA archival data in the GOODS-South field, we find that 24 ZFOURGE sources have 1.2 mm counterparts with a signal-to-noise ratio $>$ 4.5 (1$σ\simeq$ 30 - 70 $μ$Jy beam$^{-1}$ at 1.2 mm). Their median redshift is estimated to be $z_\mathrm{median}=$ 2.38 $\pm$ 0.14. They generally follow the tight relationship of the stellar mass versus star formation rate (i.e., the main sequence of star-forming galaxies). ALMA-detected ZFOURGE sources exhibit systematically larger infrared (IR) excess (IRX $\equiv L_\mathrm{IR}/L_\mathrm{UV}$) compared to ZFOURGE galaxies without ALMA detections even though they have similar redshifts, stellar masses, and star formation rates. This implies the consensus stellar-mass versus IRX relation, which is known to be tight among rest-frame-UV-selected galaxies, can not fully predict the ALMA detectability of stellar-mass-selected galaxies. We find that ALMA-detected ZFOURGE sources are the main contributors to the cosmic IR star formation rate density at $z$ = 2 - 3.

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