An ALMA survey of sub-millimetre Galaxies in the Extended Chandra Deep Field South: the far-infrared properties of SMGs
An ALMA survey of sub-millimetre Galaxies in the Extended Chandra Deep Field South: the far-infrared properties of SMGs
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DOI：
10.1093/mnras/stt2273
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发表时间：
2013-10
影响因子：
4.8
通讯作者：
M. Swinbank;J. Simpson;I. Smail;C. Harrison;J. Hodge;A. Karim;F. Walter;D. Alexander;N. Brandt;C. Breuck;E. D. Cunha;S. Chapman;K. Coppin;A. Danielson;H. Dannerbauer;Roberto Decarli Thomas Greve;R. Ivison;K. Knudsen;C. Lagos;E. Schinnerer;A. Thomson;J. Wardlow;A. Weiss;Paul van der Werf Icc;Durham;Heidelberg;Bonn;Penn State;Eső;Dalhousie;Hertfordshire;Vienna;Ucl;Ifa;Edinburgh;Chalmers;UC Irvine;Leiden
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作者：
M. Swinbank;J. Simpson;I. Smail;C. Harrison;J. Hodge;A. Karim;F. Walter;D. Alexander;N. Brandt;C. Breuck;E. D. Cunha;S. Chapman;K. Coppin;A. Danielson;H. Dannerbauer;Roberto Decarli Thomas Greve;R. Ivison;K. Knudsen;C. Lagos;E. Schinnerer;A. Thomson;J. Wardlow;A. Weiss;Paul van der Werf Icc;Durham;Heidelberg;Bonn;Penn State;Eső;Dalhousie;Hertfordshire;Vienna;Ucl;Ifa;Edinburgh;Chalmers;UC Irvine;Leiden
利用阿塔卡马大型毫米波阵列（ALMA） 870 μ m的亚毫米源观测数据，研究了高红移亚毫米星系（smg）的远红外特性。利用精确定位的870 μ m ALMA位置，结合24 μ m和无线电成像，我们对Herschel/SPIRE成像进行了分解，提取了它们的远红外通量和颜色。在至少两个SPIRE波段检测到的ALMA LESS (ALESS) SMGs的中位红移随其光谱能量分布（SEDs）中峰波长的增加而增加，其中250、350和500 μ m峰的中位红移分别为z = 2.3 +/- 0.2、2.5 +/- 0.3和3.5 +/- 0.5。34个ALESS SMG在250、350或500 μ m处没有>3 sigma对应物。这些星系的中位数光度红移来自静帧紫外-中红外SEDs，其值为z = 3.3 +/- 0.5，高于完整的ALESS SMG样本；Z = 2.5 +/- 0.2。我们估计了每个SMG的远红外光度和特征尘埃温度，得到L-IR = (3.0 +/- 0.3) x 10（12）个l -圆点（SFR = 300 +/- 30 m -圆点yr(-1)）和T-d = 32 +/- 1 K。这些高红移smg的特征尘埃温度为δ T-d = 3-5K，低于z = 0时相对明亮的星系，反映了这些系统中更广泛的恒星形成。我们表明，S-870 μ m >= 1 mJy SMGs对宇宙恒星形成预算的贡献是在红移范围z类似于1-4的总数的20%。采用适当的气尘比，我们估计M-H2的ALESS SMGs的典型分子质量= (4.2 +/- 0.4)× 10(10) m -圆点。最后，我们发现S-870 μ m bbb10 - 1mjy （L-IR大于或接近10（12）个l圆点）的smg含有类似于2体积平均H-2质量密度的10%的z。
We exploit Atacama Large Millimeter Array (ALMA) 870 mu m observations of sub-millimetre sources in the Extended Chandra Deep Field South to investigate the far-infrared properties of high-redshift sub-millimetre galaxies (SMGs). Using the precisely located 870 mu m ALMA positions of 99 SMGs, together with 24 mu m and radio imaging, we deblend the Herschel/SPIRE imaging to extract their far-infrared fluxes and colours. The median redshifts for ALMA LESS (ALESS) SMGs which are detected in at least two SPIRE bands increases with wavelength of the peak in their spectral energy distributions (SEDs), with z = 2.3 +/- 0.2, 2.5 +/- 0.3 and 3.5 +/- 0.5 for the 250, 350 and 500 mu m peakers, respectively. 34 ALESS SMGs do not have a >3 sigma counterpart at 250, 350 or 500 mu m. These galaxies have a median photometric redshift derived from the rest-frame UV-mid-infrared SEDs of z = 3.3 +/- 0.5, which is higher than the full ALESS SMG sample; z = 2.5 +/- 0.2. We estimate the far-infrared luminosities and characteristic dust temperature of each SMG, deriving L-IR = (3.0 +/- 0.3) x 10(12) L-circle dot (SFR = 300 +/- 30 M-circle dot yr(-1)) and T-d = 32 +/- 1 K. The characteristic dust temperature of these high-redshift SMGs is Delta T-d = 3-5K lower than comparably luminous galaxies at z = 0, reflecting the more extended star formation in these systems. We show that the contribution of S-870 mu m >= 1 mJy SMGs to the cosmic star formation budget is 20 per cent of the total over the redshift range z similar to 1-4. Adopting an appropriate gas-to-dust ratio, we estimate a typical molecular mass of the ALESS SMGs of M-H2 = (4.2 +/- 0.4) x 10(10) M-circle dot. Finally, we show that SMGs with S-870 mu m > 1 mJy (L-IR greater than or similar to 10(12) L-circle dot) contain similar to 10 per cent of the z similar to 2 volume-averaged H-2 mass density.