两维银河系旋臂对比度

为改善文献上惯用的表现银河系分子谱线巡视结果的完全平滑了方位信息的径向分布方法,我们发展了原子气体或分子云参量的分环银经分布图,(X—l)_i图,它在某种程度上给出了方位信息。用现存旋臂模型结合这种图我们得到的银道面旋臂区和臂间区的E(HI),E(CO),E(~(13)CO)和N/S(~(13)CO)的两维对比度约为1—2。

Two-Dimensional Milky Way Spiral Arm Contrast

To improve radial distribution diagrams conventionally adopted in the existing literature, we develop a new presentation of radio spectral line surveys, the longitudinal distribution diagrams of physical parameters of atomic gas or molecular clouds in divided galactic annuli. Using those diagrams, which give azimuth information to some extent, we derive twodimensional contrasts between arm regions and regions near arms according to existing spiral arm models in the galactic plane. The contrasts between arm regions and the regions near arms we obtained are approximately 1-2 for E(HI), E(CO),E(13CO), and N/S(13CO).