标题： 野村一氧化碳邻近旋涡星系图集：条状和非条状旋涡星系中分子气体的分布 显示英文标题

标题： Nobeyama CO Atlas of Nearby Spiral Galaxies: Distribution of Molecular Gas in Barred and Non-barred Spiral Galaxies

摘要： 从使用那须山45米射电望远镜进行的40个附近螺旋星系的CO(1 - 0)映射调查的数据被呈现出来。 样本选择的标准是（1）RC3形态类型在Sa到Scd之间，（2）距离小于25 Mpc，（3）倾斜角度小于79deg（RC3），（4）100 um处的流量高于约10 Jy，（5）螺旋结构未因相互作用而被破坏。 CO的地图覆盖了星系大部分的光学盘。 我们利用这些数据研究了棒状结构对螺旋星系中分子气体分布的影响。 我们确认了如先前工作所示，棒旋星系的中心集中程度高于非棒旋星系。 此外，我们提供了观测证据表明，棒状结构能够有效地将位于棒长度范围内的分子气体驱向中心，而从盘的外部区域带来气体的作用较小。 运输的气体约占棒旋星系中心区域分子气体的一半。 我们发现中心集中程度与棒强度之间存在相关性。 具有更强棒的星系倾向于具有更高的中心集中度。 这种相关性意味着更强的棒更有效地将分子气体聚集到中心。 这些结果与长寿命的棒是一致的。 显示英文摘要

摘要： The data from a CO(1 - 0) mapping survey of 40 nearby spiral galaxies performed with the Nobeyama 45-m telescope are presented. The criteria of the sample selection were (1) RC3 morphological type in the range Sa to Scd, (2) distance less than 25 Mpc, (3) inclination angle less than 79deg (RC3), (4) flux at 100 um higher than ~ 10 Jy, (5) spiral structure is not destroyed by interaction. The maps of CO cover most of the optical disk of the galaxies. We investigated the influence of bar on the distribution of molecular gas in spiral galaxies using these data. We confirmed that the degree of central concentration is higher in barred spirals than in non-barred spirals as shown by the previous works. Furthermore, we present an observational evidence that bars are efficient in driving molecular gas that lies within the bar length toward the center, while the role in bringing gas in from the outer parts of the disks is small. The transported gas accounts for about half of molecular gas within the central region in barred spiral galaxies. We found a correlation between the degree of central concentration and bar strength. Galaxies with stronger bars tend to have higher central concentration. The correlation implies that stronger bars accumulate molecular gas toward the center more efficiently. These results are consistent with long-lived bars.