论文标题
在强烈禁止的Galaxy NGC1300的棒中，大量的弥漫性分子气体：低恒星形成效率的原因
A large amount of diffuse molecular gases in the bar of the strongly barred galaxy NGC1300: Cause of the low star formation efficiency
论文作者
论文摘要
在许多禁止的星系中，钢筋中的恒星形成效率（SFE）低于手臂和条形端的恒星形成效率（SFE），其原因尚不清楚。着眼于强烈禁止的Galaxy NGC 1300，我们研究了大量弥漫性分子气的存在可能不会导致SF，从而使SFE的外观低。我们检查了SFE与弥漫性分子气体分数（$ f _ {\ rm dif} $）之间的关系，该$是使用$^{12} $ co（$ 1-0 $）磁通量从Alma 12米阵列的干涉仪中获得的flux（$ 1-0 $）的磁通量，这对diffuse diffuse; f diffuse; f whnm $ \ f whm pc; ACA，总计$^{12} $ co（$ 1-0 $）的通量从Nobeyama 45米单端望远镜获得。我们发现SFE随着$ f _ {\ rm dif} $的增加而减小。 $ f _ {\ rm dif} $和$ {\ rm sfe} $是$ 0.74-0.91 $和$（0.06-0.16-0.16）〜\ rm gyr^{ - 1} $在酒吧区域，以及$ 0.28-0.65-0.65 $ and $（0.23-0.96-0.96-0.96）该结果支持这样的想法：大量弥漫性分子气体的存在使SFE低。即使我们排除了弥漫性分子气体成分，也可以看到钢筋中SFE的抑制。这表明低SFE似乎不仅是由大量弥漫性分子气体引起的，而且还由其他机制（例如快速云云碰撞）引起。
In many barred galaxies, star formation efficiency (SFE) in the bar is lower than those in the arm and bar-end, and its cause has still not been clear. Focusing on the strongly barred galaxy NGC 1300, we investigate the possibility that the presence of a large amount of diffuse molecular gas, which would not contribute to the SF, makes the SFE low in appearance. We examine the relation between the SFE and the diffuse molecular gas fraction ($f_{\rm dif}$), which is derived using the $^{12}$CO($1-0$) flux obtained from the interferometer of ALMA 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. We find 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 bar regions, and $0.28 - 0.65$ and $(0.23 - 0.96) ~\rm Gyr^{-1}$ in the arm and bar-end regions. This result supports the idea that the presence of a large amount of diffuse molecular gas makes the SFE low. The suppression of the SFE in the bar has also been seen even when we exclude the diffuse molecular gas components. This suggests that the low SFE appears to be caused not only by a large amount of diffuse molecular gases but also by other mechanisms such as fast cloud-cloud collisions.
