AzTEC/ASTE对AKARI深野外南部的1.1毫米测量：震源目录和数量计数
AzTEC/ASTE 1.1-mm Survey of the AKARI Deep Field South: source catalogue and number counts
摘要：
我们目前的AKARI深场南（ADF-S）与AzTEC安装在阿塔卡马亚毫米望远镜实验（ASTE）的1.1毫米深的调查结果。我们得到了0.25平方米的地图。deg区域，均方根噪声电平为0.32-0.71 mJy。这是迄今为止在毫米和亚毫米波长上最深和最宽的地图之一。我们发现了198个显著性为3.5-15.6 sigma的源，提供了相邻区域中最大的1.1 mm源目录。大多数辐射源在AKARI卫星的远红外波段都没有被探测到，这表明它们大多位于z ~ 1.5的探测极限。我们在ADF-S，斯巴鲁/XMM牛顿深场（SXDF）和AzTEC/ASTE调查的SSA 22场中构建了差分和累积计数，这些场提供了目前对微弱端的最严格限制。ADF-S中最佳拟合计数的积分发现，通量>=1 mJy的1.1 mm源对1.1 mm处宇宙红外背景（CIB）的贡献为12- 16%，这表明大部分CIB来自数量计数尚未受到约束的微弱源。我们使用ADF-S中的最佳拟合数计数估计了大于等于1 mJy的1.1 mm源所贡献的宇宙恒星形成率密度，发现它比来自z ~ 2-3的UV/光学选择星系的宇宙恒星形成率密度低约5-10倍。通过恒星形成速率密度的时间积分计算，在z >= 1时，1.1 mm源产生的大于1 mJy的恒星质量在现今宇宙中所占的比例约为20%。如果我们考虑再循环分数>0.4，这是形成恒星的物质返回到星际介质的分数，由1.1 mm源产生的恒星质量的分数下降到<~ 10%。
英文摘要：
We present results of a 1.1 mm deep survey of the AKARI Deep Field South (ADF-S) with AzTEC mounted on the Atacama Submillimetre Telescope Experiment (ASTE). We obtained a map of 0.25 sq. deg area with an rms noise level of 0.32-0.71 mJy. This is one of the deepest and widest maps thus far at millimetre and submillimetre wavelengths. We uncovered 198 sources with a significance of 3.5-15.6 sigma, providing the largest catalog of 1.1 mm sources in a contiguous region. Most of the sources are not detected in the far-infrared bands of the AKARI satellite, suggesting that they are mostly at z ~ 1.5 given the detection limits. We constructed differential and cumulative number counts in the ADF-S, the Subaru/XMM Newton Deep Field (SXDF), and the SSA 22 field surveyed by AzTEC/ASTE, which provide currently the tightest constraints on the faint end. The integration of the best-fit number counts in the ADF-S find that the contribution of 1.1 mm sources with fluxes >=1 mJy to the cosmic infrared background (CIB) at 1.1 mm is 12-16%, suggesting that the large fraction of the CIB originates from faint sources of which the number counts are not yet constrained. We estimate the cosmic star-formation rate density contributed by 1.1 mm sources with >=1 mJy using the best-fit number counts in the ADF-S and find that it is lower by about a factor of 5-10 compared to those derived from UV/optically-selected galaxies at z ~ 2-3. The fraction of stellar mass of the present-day universe produced by 1.1 mm sources with >=1 mJy at z >= 1 is ~20%, calculated by the time integration of the star-formation rate density. If we consider the recycled fraction of >0.4, which is the fraction of materials forming stars returned to the interstellar medium, the fraction of stellar mass produced by 1.1 mm sources decrease to <~10%.
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