论文标题
Almacal VII：第一个干涉率计数为650 $μ$ m
ALMACAL VII: First Interferometric Number Counts at 650 $μ$m
论文作者
论文摘要
宇宙远红外背景（CIB）的测量表明，在宇宙中，宇宙中的许多外部现象（包括恒星形成和黑洞积聚）的发射可以被灰尘遮盖。解决CIB以研究这种活动发生的星系人群是亚毫米列天文学的主要目标。在这里，我们提出干涉测定法650 $ $ m $ m亚略列数。使用来自Almacal调查的Band 8数据，我们分析了81个ALMA校准机场，总面积为5.5〜Arcmin $^2 $。这些字段中的典型中央RMS为$ \ sim100μ$ jy〜eb beam $^{ - 1} $，最深的地图达到$σ=47μ$ $ jy〜beam $^beam $^{ - 1} $，sub-arcsec分辨率。 Almacal的多波长覆盖范围使我们能够排除与校准机相关的喷气机的污染。但是，喷气机和镜头的残留污染仍然可能性。使用$4.5σ$的信号到噪声阈值，我们发现21个尘土飞扬的星系星系，具有650 $ $ $ $ m $ m $ flux密度为$ \ geq 0.7 $ mjy。在检测限制下，我们解决了CIB的$ \ simeq 100 $在650 $ $ m时，与相似波长的低分辨率研究相比，这是显着改善。因此，我们已经确定了以650微米为单位的EBL贡献的所有来源，并预测磁通量为0.7 <mjy的对象的贡献将很小。
Measurements of the cosmic far-infrared background (CIB) indicate that emission from many extragalactic phenomena, including star formation and black hole accretion, in the Universe can be obscured by dust. Resolving the CIB to study the population of galaxies in which this activity takes place is a major goal of submillimetre astronomy. Here, we present interferometric 650$μ$m submillimetre number counts. Using the Band 8 data from the ALMACAL survey, we have analysed 81 ALMA calibrator fields together covering a total area of 5.5~arcmin$^2$. The typical central rms in these fields is $\sim 100 μ$Jy~beam$^{-1}$ with the deepest maps reaching $σ= 47 μ$Jy~beam$^{-1}$ at sub-arcsec resolution. Multi-wavelength coverage from ALMACAL allows us to exclude contamination from jets associated with the calibrators. However, residual contamination by jets and lensing remain a possibility. Using a signal-to-noise threshold of $4.5σ$, we find 21 dusty, star-forming galaxies with 650$μ$m flux densities of $\geq 0.7 $mJy. At the detection limit we resolve $\simeq 100$ per cent of the CIB at 650$μ$m, a significant improvement compared to low resolution studies at similar wavelength. We have therefore identified all the sources contributing to the EBL at 650 microns and predict that the contribution from objects with flux 0.7<mJy will be small.
