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The first deep blank-field 450um map (1-sigma~1.3mJy) from the SCUBA-2Cosmology Legacy Survey (S2CLS), conducted with the James Clerk MaxwellTelescope (JCMT) is presented. Our map covers 140 arcmin^2 of the COSMOS field,in the footprint of the HST CANDELS area. Using 60 submillimetre galaxies(SMGs) detected at >3.75-sigma, we evaluate the number counts of 450um-selectedgalaxies with flux densities S_450>5mJy. The 8-arcsec JCMT beam and highsensitivity of SCUBA-2 now make it possible to directly resolve a largerfraction of the cosmic infrared background (CIB, peaking at ~200um) into theindividual galaxies responsible for its emission than has previously beenpossible at this wavelength. At S_450>5mJy we resolve (7.4[+/-]0.7)x10^-2MJy/sr of the CIB at 450um (equivalent to 16[+/-]7% of the absolute brightnessmeasured by COBE at this wavelength) into point sources. A further ~40% of theCIB can be recovered through a statistical stack of 24um emitters in thisfield, indicating that the majority (~60%) of the CIB at 450um is emitted bygalaxies with S_450>2mJy. The average redshift of 450um emitters identifiedwith an optical/near-infrared counterpart is estimated to be <z>=1.3, implyingthat the galaxies in the sample are in the ultraluminous class (L_IR~1.1x10^12L_sun). If the galaxies contributing to the statistical stack lie at similarredshifts, then the majority of the CIB at 450um is emitted by galaxies in theLIRG class with L_IR>3.6x10^11 L_sun.

The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450um-selected galaxies and their contribution to the cosmic infrared background