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We present a new on-the-fly (OTF) mapping of CO(J=3-2) line emission with theAtacama Submillimeter Telescope Experiment (ASTE) toward the 8' x 8' (or 10.5 x10.5 kpc at the distance of 4.5 Mpc) region of the nearby barred spiral galaxyM 83 at an effective resolution of 25''. Due to its very high sensitivity, ourCO(J=3-2) map can depict not only spiral arm structures but also spur-likesubstructures extended in inter-arm regions. This spur-like substructures inCO(J=3-2) emission are well coincident with the distribution of massive starforming regions traced by Halpha luminosity and Spitzer/IRAC 8 um emission. Wehave identified 54 CO(J=3-2) clumps as Giant Molecular-cloud Associations(GMAs) employing the CLUMPFIND algorithm, and have obtained their sizes,velocity dispersions, virial masses, and CO luminosity masses. We found thatthe virial parameter alpha, which is defined as the ratio of the virial mass tothe CO luminosity mass, is almost unity for GMAs in spiral arms, whereas thereexist some GMAs whose alpha are 3 -- 10 in the inter-arm region. We found thatGMAs with higher $\alpha$ tend not to be associated with massive star formingregions, while other virialized GMAs are. Since alpha mainly depends onvelocity dispersion of the GMA, we suppose the onset of star formation in theseunvirialized GMAs with higher alpha are suppressed by an increase in internalvelocity dispersions of Giant Molecular Clouds within these GMAs due to shearmotion.

ASTE CO(3-2) Mapping toward the Whole Optical Disk of M 83: Properties of Inter-arm GMAs