对银河系Sagittarius-Carina旋臂和晕质量的研究  

The Sagittarius-Carina Aam and Halo Mass of Our Galaxy with Different Rotation Curves

作　　者：张明[1] 韩金林[1] 彭秋和[2] 

机构地区：[1]中国科学院国家天文台,北京100012 [2]南京大学天文系

出　　处：《天文学报》2002年第1期24-32,共9页Acta Astronomica Sinica

基　　金：国家自然科学基金重点项目(10173005);973项目资助

摘　　要：利用新的银河系旋转曲线和银河系常数，由 Ｈ Ⅱ区和巨分子云等示踪天体重新确定了银河系的Ｓａｇｉｔｔａｊｒｉｕｓ－Ｃａｒｉｎａ旋臂，得到了其倾角约为１２°，并探索了旋臂倾角与银河系常数Ｒｏ，Ｖｏ的依赖关系，结果表明，减小银河系常数Ｒｏ，Ｖｏ将导致旋臂倾角的增大，从而按照对数螺旋模型估计的银河系旋臂数目有取大的趋向．同时，银河系晕的质量随着旋转曲线的下倾也将逐渐减小．We revised the Sagittarius-Carina arm pattern by H Ⅱ regions and the Giant Molecular Clouds, according to the new Galaxy rotation curve and the Galactic constants. We found the pitch angle of the spiral arm is approximately 12° which depends on the Galactic constants R0 and V0. We get the result that the pitch angle has a tendency to become larger when the values of Ro and V0 decrease. So according to logarithmic spiral model, the number of the Galactic arms seems to become larger. And the halo mass of the Galaxy also decreases with the declining of the rotation curve.

关 键 词：银河系 旋臂结构 晕 对数螺旋模型 旋转曲线 

分 类 号：P156[天文地球—天文学]