The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- V. Submillimetre properties of near-infrared--selected galaxies in the Subaru/XMM--Newton deep field
The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- V. Submillimetre properties of near-infrared--selected galaxies in the Subaru/XMM--Newton deep field
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DOI：
10.1111/j.1365-2966.2007.12302.x
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发表时间：
2007-08
影响因子：
4.8
通讯作者：
T. Takagi;A. Mortier;K. Shimasaku;K. Coppin;A. Pope;R. Ivison;H. Hanami;S. Serjeant;D. Clements;R. Priddey;J. Dunlop;T. Takata;I. Aretxaga;S. Chapman;S. Eales;D. Farrah;G. Granato;M. Halpern;D. Hughes;E. V. Kampen;D. Scott;K. Sekiguchi;I. Smail;Mattia Vaccari
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文献类型：
--
作者：
T. Takagi;A. Mortier;K. Shimasaku;K. Coppin;A. Pope;R. Ivison;H. Hanami;S. Serjeant;D. Clements;R. Priddey;J. Dunlop;T. Takata;I. Aretxaga;S. Chapman;S. Eales;D. Farrah;G. Granato;M. Halpern;D. Hughes;E. V. Kampen;D. Scott;K. Sekiguchi;I. Smail;Mattia Vaccari
我们研究了以下几类近红外选择（NIR选择）大质量星系在高红移的亚毫米（submm）特性：BzK选择的恒星形成星系（BzKs），遥远的红色星系（DRG）和极红物体（ERO）。我们使用了SCUBA半度河外巡天（SHADES），这是迄今为止最大的均匀亚毫米巡天。在Subaru/XMM-Newton深场中，SIRIUS/NIR图像和SHADES图像的部分重叠使我们能够识别出4个亚毫米亮的近红外选择星系，它们在中红外24 μm和射电1.4GHz处被探测到。我们发现所有的亚毫米亮近红外选择星系都满足BzK选择标准，即BzK <$（z-K）_（AB）-（B）_（AB）≥-0.2，除了一个星系的B和z-K颜色接近BzK颜色边界。其中两个亚毫米亮的近红外选择星系满足我们考虑的所有选择标准，即它们属于BzK-DRG-ERO重叠种群，或“极红”BzKs。虽然这些极红的BzK非常罕见（0.25弧分^（-2）），但其中高达20%的可能是亚毫米星系。这一比例明显高于这里研究的其他星系群。通过叠加分析，我们在我们的SCUBA图中探测到了亚毫米级微弱BzKs和ERO的850 μm通量。虽然z ~ 2 BzKs对亚毫米背景的贡献约为10- 15%，与z ~ 1处的ERO的贡献相似，但与ERO和亚毫米源整体相比，BzKs在分辨源中的亚毫米通量比例更高（约30%）。从光谱能量分布（SED）拟合分析亚毫米亮和亚毫米暗BzKs，我们没有发现明确的签名，亚毫米亮BzKs正在经历一个特别明亮的进化阶段，与亚毫米暗BzKs相比。另一种解释可能是，亚毫米亮的BzK比亚毫米暗的BzK质量更大。
We have studied the submillimetre (submm) properties of the following classes of near-infrared-selected (NIR-selected) massive galaxies at high redshifts: BzK-selected star-forming galaxies (BzKs); distant red galaxies (DRGs); and extremely red objects (EROs). We used the SCUBA HAlf Degree Extragalactic Survey (SHADES), the largest uniform submm survey to date. Partial overlap of SIRIUS/NIR images and SHADES in Subaru/XMM–Newton deep field has allowed us to identify four submm-bright NIR-selected galaxies, which are detected in the mid-IR, 24 μm, and the radio, 1.4GHz. We find that all of our submm-bright NIR-selected galaxies satisfy the BzK selection criteria, i.e. BzK≡ (z−K)_(AB)− (B−z)_(AB)≥−0.2 , except for one galaxy whose B−z and z−K colours are however close to the BzK colour boundary. Two of the submm-bright NIR-selected galaxies satisfy all of the selection criteria we considered, i.e. they belong to the BzK–DRG–ERO overlapping population, or 'extremely red'BzKs. Although these extremely red BzKs are rare (0.25 arcmin^(−2)), up to 20 per cent of this population could be submm galaxies. This fraction is significantly higher than that found for other galaxy populations studied here. Via a stacking analysis, we have detected the 850-μm flux of submm-faint BzKs and EROs in our SCUBA maps. While the contribution of z ~ 2 BzKs to the submm background is about 10–15 per cent and similar to that from EROs typically at z ~ 1, BzKs have a higher fraction (~30 per cent) of submm flux in resolved sources compared with EROs and submm sources as a whole. From the spectral energy distribution (SED) fitting analysis for both submm-bright and submm-faint BzKs, we found no clear signature that submm-bright BzKs are experiencing a specifically luminous evolutionary phase, compared with submm-faint BzKs. An alternative explanation might be that submm-bright BzKs are more massive than submm-faint ones.