Faint End of 1.3 mm Number Counts Revealed by ALMAReport as inadecuate



 Faint End of 1.3 mm Number Counts Revealed by ALMA


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We present the faint end of number counts at 1.3 mm (238 GHz) obtained with the Atacama Large Millimeter-submillimeter Array (ALMA). Band 6 observations were carried out targeting 20 star-forming galaxies at z ~ 1.4 in the Subaru-XMM-Newton Deep Survey field. In the observations, we serendipitously detect 15 sources (>=3.8 sigma, S(1.3 mm) = 0.15-0.61 mJy) other than the targeted sources. We create number counts by using these `sub-mJy sources, which probe the faintest flux range among surveys at millimeter wavelengths. The number counts are consistent with (flux-scaled) number counts at 850 um and 870 um obtained with gravitational lensing clusters. The ALMA number counts agree well with model predictions, which suggest that these sub-mJy populations are more like `normal star-forming galaxies than `classical SMGs with intense star-forming activity. In this flux range, ~80% of the extragalactic background light at 1.3 mm is resolved into individual sources.



Author: Bunyo Hatsukade; Kouji Ohta; Akifumi Seko; Kiyoto Yabe; Masayuki Akiyama

Source: https://archive.org/







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