摘要
利用LAMOST巡天得到的红团簇星,对银河系外盘的屋脊结构在角动量和作用量空间中的分布进行了探索。研究屋脊在R-V?平面分布时,第三维度选择为数密度、径向速度和垂直速度,都有很明显的屋脊信号。其中,数密度图中角动量分别为2030、2200、2400 km·s^(-1)·kpc的三条屋脊以及径向速度图中一条疑似屋脊(L_(Z)=2480 km·s^(-1)·kpc)的信号是新发现的成果。R-V_(Φ)平面中的屋脊结构在R_(g)-V_(Φ)平面转换为几乎垂直的屋脊,在L_(Z-Φ)平面转换为水平的屋脊。通过利用作用量信息探索银河系外盘的屋脊,发现了3条疑似屋脊的信号。最后,在引导空间中探索银河系的特征信号时,总共发现了5个明显的结构,其中,4个过密度区域在径向速度分布图中,1个过密度区域在垂直速度分布图中。
The ridge structure distribution of the galactic outer disk in the space of angular momentum and action is explored by red clump stars obtained from LAMOST survey.When studying the ridge distribution in the R-V∅plane,the third dimension is chosen as the number density,radial velocity and vertical velocity,all of which have a clear signal of the ridge.Among them,the newly discovered results are three ridges with angular momentum of 2030,2200,and 2400 km·s^(-1)·kpc in the number density map and a suspected ridge(L_(Z)=2480 km·s^(-1)·kpc)in the radial velocity map.The diagonal ridge structure in the R-V_(Φ)plane has almost converted to vertical ridge in the R_(g)-V_(Φ)plane and horizontal ridge in the L_(Z-Φ) plane.Three suspected ridge signals are found by utilizing the action information to explore the ridge in the outer disk of the Galaxy.Finally,a total of five distinct structures are discovered when exploring the galactic signatures in the guiding space,of which four over-density regions are in the radial velocity distribution diagram and one over-density region is in the vertical velocity distribution diagram.
作者
杨鹏
李祥
罗志全
罗杨平
YANG Peng;LI Xiang;LUO Zhi-quan;LUO Yang-ping(School of Physics and Astronomy,China West Normal University,Nanchong Sichuan 637009,China)
出处
《西华师范大学学报（自然科学版）》
2023年第6期647-654,共8页
Journal of China West Normal University(Natural Sciences)
基金
国家自然科学基金项目(12173028)
青海省科技厅重大项目(2019-ZJ-A10)。
