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We report the results of our observations of the 12CO (J=1-0) and 12CO(J=3-2) line emission of 74 major giant molecular clouds (GMCs) within thegalactocentric distance of 5.1 kpc in the Local Group galaxy M33. Theobservations have been conducted as part of the Nobeyama Radio Observatory M33All-disk survey of Giant Molecular Clouds project (NRO MAGiC). The spatialresolutions are 80 pc for 12CO (J=1-0) and 100 pc for 12CO (J=3-2). We detect12CO (J=3-2) emission of 65 GMCs successfully. Furthermore, we find that thecorrelation between the surface density of the star formation rate, which isderived from a linear combination of Halpha and 24um emissions, and the 12CO(J=3-2) integrated intensity still holds at this scale. This result show thatthe star-forming activity is closely associated with warm and dense gases thatare traced with the 12CO (J=3-2) line, even in the scale of GMCs. We also findthat the GMCs with a high star-forming activity tend to show a high integratedintensity ratio (R3-2/1-0). Moreover, we also observe a mass-dependent trend ofR3-2/1-0 for the GMCs with a low star-forming activity. From these results, wespeculate that the R3-2/1-0 values of the GMCs with a low star-forming activitymainly depend on the dense gas fraction and not on the temperature, andtherefore, the dense gas fraction increases with the mass of GMCs, at least inthe GMCs with a low star-forming activity.

NRO M33 All-Disk Survey of Giant Molecular Clouds (NRO MAGiC): II. Dense Gas Formation within Giant Molecular Clouds in M33