SXDF-ALMA 2 arcmin2 deep survey: Resolving and characterizing the infrared extragalactic background light down to 0.5 mJy
SXDF-ALMA 2 arcmin2 deep survey: Resolving and characterizing the infrared extragalactic background light down to 0.5 mJy
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SXDF-ALMA 2 arcmin2 深度勘测：解析和表征低至 0.5 mJy 的红外河外背景光
DOI：
10.1093/pasj/psw073
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发表时间：
2016
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影响因子：
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通讯作者：
Minju et al.
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文献类型：
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作者：
Yamaguchi;Yuki; Tamura;Yoichi; Kohno;Kotaro; Aretxaga;Itziar; Dunlop;James S.; Hatsukade;Bunyo; Hughes;David; Ikarashi;Soh; Ishii;Shun; Ivison;Rob J.; Izumi;Takuma; Kawabe;Ryohei; Kodama;Tadayuki; Lee;Minju et al.
本文利用阿塔卡马大型毫米/亚毫米阵列（ALMA）对斯巴鲁/ xmm -牛顿深测场(SXDF)-UDS-CANDELS场（2 arcmin2, 1σ = 0.055 mJy波束- 1）在1.1mm深度连续测量中探测到的5个亚毫米源（S1.1mm= 0.54-2.02 mJy）进行了多波长分析。两个最亮的源对应于一个已知的单碟（AzTEC）选择的明亮的亚毫米星系（SMG），而其余三个是ALMA新发现的微弱的SMG。如果我们排除两个最亮的源，alma探测到的微弱SMGs对河外红外背景光的贡献估计为j°−2，对应于河外红外背景光。这表明它们对河外红外背景光的贡献与明亮的smg一样大。我们确定了5个ALMA源的多波长对应体。其中一个光源（SXDF-ALMA3）在光学到近红外区域非常微弱，尽管它的红外亮度（或SFR≃100M⊙yr−1）。通过拟合剩余4个ALMA光源在光-近红外波段的光谱能量分布，我们得到了光度红移（zphoto）和恒星质量（M*）：zphoto≃1.3-2.5,M*≃(3.5-9.5)× 1010M⊙。我们还推导出它们的恒星形成速率（SFRs）和特定SFRs分别为≃30-200M⊙yr−1和≃0.8-2 Gyr−1。这些值暗示它们是主序星形成星系。
We present a multiwavelength analysis of five submillimeter sources (S1.1mm= 0.54–2.02 mJy) that were detected during our 1.1 mm deep continuum survey in the Subaru/XMM-Newton Deep Survey Field (SXDF)-UDS-CANDELS field (2 arcmin2, 1σ = 0.055 mJy beam−1) using the Atacama Large Millimeter/submillimeter Array (ALMA). The two brightest sources correspond to a known single-dish (AzTEC) selected bright submillimeter galaxy (SMG), whereas the remaining three are faint SMGs newly uncovered by ALMA. If we exclude the two brightest sources, the contribution of the ALMA-detected faint SMGs to the infrared extragalactic background light is estimated to beJy deg−2, which corresponds toof the infrared extragalactic background light. This suggests that their contribution to the infrared extragalactic background light is as large as that of bright SMGs. We identified multiwavelength counterparts of the five ALMA sources. One of the sources (SXDF-ALMA3) is extremely faint in the optical to near-infrared region despite its infrared luminosity (or SFR ≃ 100M⊙yr−1). By fitting the spectral energy distributions at the optical-to-near-infrared wavelengths of the remaining four ALMA sources, we obtained the photometric redshifts (zphoto) and stellar masses (M*):zphoto≃ 1.3–2.5,M*≃ (3.5–9.5) × 1010M⊙. We also derived their star formation rates (SFRs) and specific SFRs as ≃30–200M⊙yr−1and ≃0.8–2 Gyr−1, respectively. These values imply that they are main sequence star-forming galaxies.