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We present the results of the wide-field $^{12}$CO (1--0) observations of thenearby barred galaxy M83 carried out with the Nobeyama Millimeter Array (NMA).The interferometric data are combined with the data obtained with the Nobeyama45-m telescope to recover the total-flux. The target fields of the observationscover the molecular bar and part of the spiral arms, with a spatial resolutionof ~110 pc x 260 pc. By exploiting the resolution and sensitivity to extendedCO emission, the impact of the galactic structures on the molecular gas contentis investigated in terms of the gas kinematics and the star formation. Byinspecting the gas kinematics, the pattern speed of the bar is estimated to be57.4 $\pm$ 2.8 km s$^{-1}$ kpc$^{-1}$, which places the corotation radius to beabout 1.7 times the semi-major radius of the bar. Within the observed field,HII regions brighter than 10$^{37.6}$ erg s$^{-1}$ in H{\alpha} luminosity arefound to be preferentially located downstream of the CO emitting regions.Azimuthal angular offsets between molecular gas and star forming (SF)calculated with the angular cross-correlation method confirm the trend. Bycomparing with a cloud orbit model based on the derived pattern speed, theangular offsets are found to be in accordance with a time delay of about 10Myr. Finally, to test whether the arm/bar promote star formation efficiency(SFE $\equiv$ Star Formation Rate (SFR)/H$_2$ mass), SFR is derived with thediffuse-background-subtracted H{alpha} and 24{\mu}m images. The arm-to-interarmratio of the SFE is found to lie in the range of 2 to 5, while it is ~1 if nobackground-removal is performed. The CO-SF offsets and the enhancement of theSFE in the arm/bar found in the inner region of M83 are in agreement with thepredictions of the classical galactic shock model.

publications of the astronomical society of japan

Wide-field 12CO (J = 1-0) Imaging of the Nearby Barred Galaxy M83 with  NMA and Nobeyema 45-m telescope: Molecular Gas Kinematics and Star Formation  Along the Bar