Inner rings in disc galaxies from UV + H{alpha}

In this Letter, I distinguish "passive" inner rings to be those with no current star formation, as distinct from "active" inner rings which have undergone recent star formation....本研究快报中，本文将“静止内环（passive inner rings）”定义为当前无恒星形成活动的天体结构，以区别于“活跃内环（active inner rings）”——后者均经历过近期的恒星形成活动。