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星系团中星系位置角的二维动力学模拟
Alternative TitleThe two-dimensional dynamic simulation of position angle of galaxy in cluster
李兴虎
Subtype硕士
Thesis Advisor张明
2015
Degree Grantor中国科学院大学
Place of Conferral中国科学院新疆天文台
Degree Discipline理学
Keyword星系团 星系的动力学演化 星系的位置角 数值模拟
Abstract星系团的成员星系的旋转矢量的研究有助于解星系尺度以及宇宙大尺度的形成。如果星系的角动量从形成之初到现在没有多少改变的话,那么星系角动量现在的方向就可以代表星系刚形成时的星系角动量的方向。所以对星系角动量方向的研究有助于了解星系形成和起源的信息。研究星系旋转矢量方向的文章有很多,主要区别可能是选择的样本和方法的标准不同,导致结果也不同,不过趋于一致的研究越来越多。 有关星系团和星系的起源的模型有很多,很多都对星系团或超星系的成员星系的角动量方向分布的规律作出了预言和解释。然而由于已知的星系团或超星系团中星系旋转矢量的星系并不多,所以需要研究另外一个参数的分布代替星系的旋转矢量来研究星系的旋转,星系的位置角分布就是一个很好的参数,我们主要呈现的就是星系位置角矢量的数值模拟。在星系的的数值模拟中我们用的是“哑铃模型”,将星系类似成一个刚体的哑铃,质量主要集中在两端,来简化研究星系的旋转情况。因为如果三维空间中星系的位置角是各向同性的,那么二维空间里星系的位置角也一定是各向同性的。反之,如果星系的位置角在二维空间中是各向异性的那么三维里也一定是各向异性的,因此我们模拟二维空间里的星系位置角的情况,也能反映出一定三维星系的位置角的分布情况。我们模拟了SIS理论模型和NFW理论模型下的星系团中星系的动力学演化情况,并给出了星系团中星系的动力学演化情况和分布图,分别统计了SIS理论模型和NFW理论模型下的星系的位置角分布情况,并统计后作出了直方图。用了GSL和GNUPLOT拟合了高斯函数曲线,对比了两种拟合的系数的误差情况。
Other AbstractThe distribution of rotation vector of galaxy cluster is important for understanding the formation of galaxies and large-scale universe. If the angular momentum of galaxy has no obvious change since the formation of galaxy, then the current angular momentum of galaxy can indicate the original galaxy angular momentum. Such hypothesis has been proved by many reports, even though the methods and the sample standards are different. Therefore, the study of rotation vector of galaxy cluster could contribute to recognize the origin of galaxies. However, few rotation vector of galaxy has been known, and many models about the formation and origin of galaxies and galaxy clusters have been limited to theoretical language and interpretation on the vector rotation. Therefore, we need another parameter instead of angular momentum to study the rotation of galaxy, the position angular distribution as a good alternative appeared. In this work, we present one kind of numerical simulation on the galaxy location angular. Such simulation used “Dumbbell model”, which regard the galaxy as a rigid dumbbell, quality focused on both ends, to simplify study of galaxy rotation. As we all know, if the position angle of three-dimensional space galaxies is isotropic, then the two-dimensional space, galaxies position angle must be isotropic. Conversely, if the position angle galaxies anisotropy in two-dimensional space so does in the three-dimensional space. Therefore, the simulation of galaxy position angle in two-dimensional space, which can also reflect a certain distribution of the position angle in three-dimensional. The simulation displayed the distribution diagram of the dynamic evolution of galaxies in galaxy clusters and showed two statistical histograms of the position angle distribution of galaxy based on the “SIS” and “NFW” theory modes, respectively. “GSL and GNUPLOT” were applied to fit Gaussian function curve. Compare the two deviations of fitting coefficients.
Subject Area天体物理
Language中文
Document Type学位论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/653
Collection研究生学位论文
射电天文研究室
Recommended Citation
GB/T 7714
李兴虎. 星系团中星系位置角的二维动力学模拟[D]. 中国科学院新疆天文台. 中国科学院大学,2015.
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