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Star formation activity depends on galactic-scale environments. To understandthe variations in star formation activity, comparing the properties of giantmolecular clouds (GMCs) among environments with different star formationefficiency (SFE) is necessary. We thus focus on a strongly barred galaxy toinvestigate the impact of the galactic environment on the GMCs properties,because the SFE is clearly lower in bar regions than in arm regions. In thispaper, we present the $^{12}$CO($1-0$) observations toward the western bar, armand bar-end regions of the strongly barred galaxy NGC1300 with ALMA 12-m arrayat a high angular resolution of $\sim$40 pc. We detected GMCs associated withthe dark lanes not only in the arm and bar-end regions but also in the barregion, where massive star formation is not seen. Using the CPROPS algorithm,we identified and characterized 233 GMCs across the observed regions. Based onthe Kolmogorov-Smirnov test, we find that there is virtually no significantvariations in GMC properties (e.g., radius, velocity dispersion, molecular gasmass, and virial parameter) among the bar, arm and bar-end region. Theseresults suggest that systematic differences in the physical properties of theGMCs are not the cause for SFE differences with environments, and that thereshould be other mechanisms which control the SFE of the GMCs such as fastcloud-cloud collisions in NGC1300.

Properties of giant molecular clouds in the strongly barred galaxy NGC1300