背景转动对涡旋星系翘曲度的影响

Influence of the background rotation on the warping degree of the vortex galaxy

随着天文观测手段的发展,涡旋星系的翘曲结构已经是一种比较普遍的宇宙现象,这种现象至今没有得到令人信服的解释。在之前的研究中,涡旋星系的普遍存在是由于星系的演化过程不是一个相对孤立的系统,而是由于其背景存在着大尺度转动,使得星系的演化更像是一个宇宙飓风的形成和演化过程。进一步研究发现涡旋星系普遍存在的翘曲结构,也是大尺度背景转动中惯性力作用的一种结果。通过研究在背景转动条件下的双粒子星系,对三维双粒子运动轨迹进行了模拟分析,讨论了背景转动角速度的大小及其方向等若干参量对星系翘曲度的影响。研究表明相关物理参量都对星系翘曲结构的驱动和形成有着重要的作用,进一步证明了物理背景的大尺度转动是形成翘曲星系的基本原因。研究发现,涡旋星系盘面的法向与背景转动角速度方向的夹角,是影响涡旋星系翘曲度的关键参数,此外背景转动角速度的大小等也是影响星系翘曲度的重要因素。

With the development of the methods in astronomical observation,the warping structure of vortex galaxies has been the universal phenomenon.However,the warping structure has no convincing explanation at present.Our previous investigations show that the reason of vortex galaxies is the large scale rotation of its background instead of a relatively isolated system.The evolution of the galaxy seems to be the same as ahurricaneon account of the large scale rotation of the background.Through our further researches,it has been proved that the warping structure of vortex galaxies isa result of the inertia force under the large scale background rotation.The galaxies of double particles under the background rotation are investigated in this paper,and the trajectories of three dimensional double particles motion have been analyzed.Meanwhile,the influences of several vital parameters such as magnitude and direction of the angular velocity have been discussed.Results indicatethat the relative physical parameters play an important role in the process of the galaxies structure formation,and the fact that the large scale rotation is the basic reason of warping galaxies has been proved.Furthermore,the studies show that the key parameter influencing warping degree of a vortex galaxy is the angle between the directions of the spiral galaxy disk and the angular velocity of the background rotation.In addition,the magnitude of the angular velocity of the background rotation is also an important factor in the formation process of the warpage of galaxies.