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We exploit ALMA 870um (345GHz) observations of submillimetre sources in theExtended Chandra Deep Field South to investigate the far-infrared properties ofhigh-redshift submillimetre galaxies (SMGs). Using the precisely located 870umALMA positions of 99 SMGs, together with 24um and radio imaging of this field,we deblend the Herschel/SPIRE imaging of this region to extract theirfar-infrared fluxes and colours. The median photometric redshifts for ALMA LESS(ALESS) SMGs which are detected in at least two SPIRE bands increases withwavelength of the peak in their SEDs, with z=2.3+/-0.2, 2.5+/-0.3 and 3.5+/-0.5for the 250, 350 and 500-um peakers respectively. We find that 34 ALESS SMGs donot have a >3-sigma counterpart at 250, 350 or 500-um. These galaxies have amedian photometric redshift of z=3.3+/-0.5, which is higher than the full ALESSSMG sample; z=2.5+/-0.2. Using the photometric redshifts together with the250-870um photometry, we estimate the far-infrared luminosities andcharacteristic dust temperature of each SMG. The median infrared luminosity ofthe S_870um>2mJy SMGs is L_IR=(3.0+/-0.3)x10^{12}Lo(SFR=300+/-30Mo/yr). At afixed luminosity, the characteristic dust temperature of these high-redshiftSMGs is 2-3K lower than comparably luminous galaxies at z=0, reflecting themore extended star formation occurring in these systems. By extrapolating the870um number counts to S_ 870um=1mJy, we show that the contribution ofS_870um>1mJy SMGs to the cosmic star formation budget is 20% of the total overthe redshift range z~1-4. We derive a median dust mass for these SMGs ofM_d=(3.6+/-0.3)x10^8Mo and by adopting an appropriate gas-to-dust ratio, weestimate an average molecular mass of M_H2=(4.2+/-0.4)x10^{10}Mo. Finally, weuse our estimates of the H2 masses to show that SMGs with S_870um>1mJy contain~10% of the z~2 volume-averaged H2 mass density at this epoch.

An ALMA Survey of Submillimetre Galaxies in the Extended Chandra Deep Field South: The Far-Infrared Properties of SMGs