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We carried out $^{12}$CO(J = 1 -0) observations toward bar and arm regions ofstrongly barred galaxies, NGC 1300 and NGC 5383, with the Nobeyama 45-m radiotelescope (beamsize of 1-2 kpc in the galaxies). The aim of the observations isto qualitatively examine a new scenario for the suppression of star formationin bars based on recent high-resolution numerical simulations: higher speedcollisions between molecular clouds in the bar region compared with the armregion suppress the massive star formation. CO emissions were detected from allthe regions, indicating the presence of the molecular gases in the strong barswithout associating clear HII regions. In both galaxies, the velocity width ofthe CO line profile tends to be larger in the bar region than in the armregion, which is qualitatively consistent with the new scenario.

Large velocity dispersion of molecular gas in bars of strongly barred galaxies, NGC 1300 and NGC 5383