由AzTEC/ASTE-II对GOODS-South油田进行的1.1毫米波长深度成像。亚毫米星系群的红移分布和性质
Deep 1.1 mm-wavelength imaging of the GOODS-South field by AzTEC/ASTE -- II. Redshift distribution and nature of the submillimetre galaxy population
摘要：
我们报告的结果对应的识别和详细分析的物理特性的48个源发现在我们的深1.1毫米波长成像调查的GOODS-South领域使用AzTEC仪器的阿塔卡马亚毫米望远镜实验（ASTE）。利用深射电连续谱、斯皮策MIPS & IRAC和LABOCA 870微米数据，分别为27个和14个AzTEC源找到了一个或多个稳健的或暂定的对应候选源。其中五个来源（10%）每个都有两个强大的对应物，支持这些星系强烈聚集和/或严重混乱的想法。光度红移和恒星形成率（SFR）的分析紫外光和红外线无线电的SED。z~2.6的中值红移与其他早期的估计相似，但我们发现80%的AzTEC-GOODS源位于z> 2，具有显著的高红移尾部（20%位于z> 3.3）。AzTEC源的静止帧UV和光学性质是极其多样的，在i和K波段光度测量中跨越10个星等，中值为i = 25.3和K = 22.6，并且红色范围很宽（i-K = 0 - 6）。这些AzTEC源是在z> 2的静止坐标系光学波段中最明亮的星系之一，推断出的恒星质量为（1 - 30）x 10 ^{10}太阳质量，由紫外线导出的恒星形成速率为SFR（UV）> 10 - 1000太阳质量/年。由红外线导出的SFR为每年200 - 2000太阳质量，与红移或恒星质量无关。由此产生的特定恒星形成率，SSFR = 1 - 100每Gyr，比z = 0的类似质量星系高10 - 100倍，并且它们扩展了先前观察到的SSFR快速上升，红移为z = 2 - 5。这些星系的SFR足够高，足以在哈勃时间内建立起它们的整个恒星质量。我们发现只有边缘的证据活动星系核的贡献，近红外和中红外的SED。（节略）
英文摘要：
We report the results of the counterpart identification and a detailed analysis of the physical properties of the 48 sources discovered in our deep 1.1mm wavelength imaging survey of the GOODS-South field using the AzTEC instrument on the Atacama Submillimeter Telescope Experiment (ASTE). One or more robust or tentative counterpart candidate is found for 27 and 14 AzTEC sources, respectively, by employing deep radio continuum, Spitzer MIPS & IRAC, and LABOCA 870 micron data. Five of the sources (10%) have two robust counterparts each, supporting the idea that these galaxies are strongly clustered and/or heavily confused. Photometric redshifts and star formation rates (SFRs) are derived by analyzing UV-to-optical and IR-to-radio SEDs. The median redshift of z~2.6 is similar to other earlier estimates, but we show that 80% of the AzTEC-GOODS sources are at z>2, with a significant high redshift tail (20% at z>3.3). Rest-frame UV and optical properties of AzTEC sources are extremely diverse, spanning 10 magnitude in the i- and K-band photometry with median values of i=25.3 and K=22.6 and a broad range of red colour (i-K=0-6). These AzTEC sources are some of the most luminous galaxies in the rest-frame optical bands at z>2, with inferred stellar masses of (1-30) x 10^{10} solar masses and UV-derived star formation rates of SFR(UV) > 10-1000 solar masses per year. The IR-derived SFR, 200-2000 solar masses per year, is independent of redshift or stellar mass. The resulting specific star formation rates, SSFR = 1-100 per Gyr, are 10-100 times higher than similar mass galaxies at z=0, and they extend the previously observed rapid rise in the SSFR with redshift to z=2-5. These galaxies have a SFR high enough to have built up their entire stellar mass within their Hubble time. We find only marginal evidence for an AGN contribution to the near-IR and mid-IR SEDs. (abridged)
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