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In many barred galaxies, star formation efficiency (SFE) in the bar is lowerthan those in the arm and bar-end, and its cause has still not been clear.Focusing on the strongly barred galaxy NGC 1300, we investigate the possibilitythat the presence of a large amount of diffuse molecular gas, which would notcontribute to the SF, makes the SFE low in appearance. We examine the relationbetween the SFE and the diffuse molecular gas fraction ($f_{\rm dif}$), whichis derived using the $^{12}$CO($1-0$) flux obtained from the interferometer ofALMA 12-m array, which has no sensitivity on diffuse (extended; FWHM$\gtrapprox 700$ pc) molecular gases due to the lack of ACA, and the total$^{12}$CO($1-0$) flux obtained from Nobeyama 45-m single-dish telescope. Wefind that the SFE decreases with increasing $f_{\rm dif}$. The $f_{\rm dif}$and ${\rm SFE}$ are $0.74 - 0.91$ and $(0.06 - 0.16) ~\rm Gyr^{-1}$ in the barregions, and $0.28 - 0.65$ and $(0.23 - 0.96) ~\rm Gyr^{-1}$ in the arm andbar-end regions. This result supports the idea that the presence of a largeamount of diffuse molecular gas makes the SFE low. The suppression of the SFEin the bar has also been seen even when we exclude the diffuse molecular gascomponents. This suggests that the low SFE appears to be caused not only by alarge amount of diffuse molecular gases but also by other mechanisms such asfast cloud-cloud collisions.

A large amount of diffuse molecular gases in the bar of the strongly barred galaxy NGC1300: Cause of the low star formation efficiency