Halpha images of stellar bars in galaxies

Stellar bars are known to gradually funnel gas to the central parts of disk galaxies. It remains a matter of debate why the distribution of ionized gas along bars and in the...恒星棒（stellar bars）已知会逐步将气体输送至盘状星系（disk galaxies）的中心区域。目前，沿棒状结构以及星系内的电离气体（ionized gas）的分布成因，仍是一个存在争议的议题。