SIMBAD references

We present deep 450µm and 850µm observations of a large, uniformly covered 394 arcmin2 area in the Cosmic Evolution Survey (COSMOS) field obtained with the Scuba-2 instrument on the James Clerk Maxwell Telescope (JCMT). We achieve root-mean-square noise values of σ450 = 4.13mJy and σ850 = 0.80mJy. The differential and cumulative number counts are presented and compared to similar previous works. Individual point sources are identified at >3.6σ significance, a threshold corresponding to a 3-5 percent sample contamination rate. We identify 78 sources at 450µm and 99 at 850µm, with flux densities S450 = 13-37mJy and S850 = 2-16mJy. Only 62-76 percent of 450µm sources are 850µm detected and 61-81 percent of 850µm sources are 450µm detected. The positional uncertainties at 450µm are small (1-2.5 arcsec) and therefore allow a precise identification of multiwavelength counterparts without reliance on detection at 24µm or radio wavelengths; we find that only 44 percent of 450µm sources and 60 percent of 850µm sources have 24µm or radio counterparts. 450µm selected galaxies peak at <z> = 1.95 ± 0.19 and 850µm selected galaxies peak at <z> = 2.16±0.11. The two samples occupy similar parameter space in redshift and luminosity, while their median SED peak wavelengths differ by ∼ 20-50µm (translating to ΔTdust = 8-12K, where 450µm selected galaxies are warmer). The similarities of the 450µm and 850µm populations, yet lack of direct overlap between them, suggests that submillimetre surveys conducted at any single far-infrared wavelength will be significantly incomplete ( ≳ 30 percent) at censusing infrared-luminous star formation at high z.