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One of the key goals of the Bluedisk survey is to characterize the impact ofgas accretion in disc galaxies in the context of galaxy evolution. It contains50 disc galaxies in the stellar mass range 10^10-10^11 Msun, of which half arebluer and more HI-rich galaxies than their HI-normal (control) counterparts. Inthis paper, we investigate how ongoing disc growth affects the molecular gasdistribution and the star-formation efficiency in these galaxies. We present12CO observations from the IRAM 30-m telescope in 26 galaxies of the Bluedisksurvey. We compare the amount and spatial distribution of the molecular gas tokey quantities such as atomic gas, stellar mass and surface density,star-formation rate and metallicity. We analyse the star-formation rate perunit gas (SFR/HI and SFR/H2) and relate all those parameters to general galaxyproperties (HI-rich/control disc, morphology, etc.). We find that the HI-richgalaxies have similar H2 masses as the control galaxies. In their centres,HI-rich galaxies have lower H2/HI ratios and marginally shorter molecular gasdepletion times. However, the main differences between the two samples occur inthe outer parts of the discs, with the HI-rich galaxies having slightly smallerCO discs (relative to the optical radius R25) and steeper CO and metallicitygradients than the control galaxies. The ongoing accretion of HI at large radiihas thus not led to an appreciable growth of the CO discs in our sample. Basedon depletion times, we estimate that this gas will contribute to star formationon time-scales of at least 5 Gyr.

The Bluedisk Survey: molecular gas distribution and scaling relations in the context of galaxy evolution