H{alpha}+[NII] observations of M81 HII regions

In a first of a series of studies of the H{alpha}+[NII] emission from nearby spiral galaxies, we present measurements of H{alpha}+[NII] emission from HII regions in M81. Our...本项研究作为针对邻近旋涡星系Hα+[NII]发射（Hα+[NII] emission）系列研究的开篇之作，我们呈现了M81星系内电离氢区（HII regions）的Hα+[NII]发射辐射测量数据。我们……