Abell 1835强引力透镜效应的研究

发布时间：2018-04-02 17:36

本文选题：宇宙学　切入点：暗物质　出处：《上海师范大学》2015年硕士论文

【摘要】：引力透镜效应是广义相对论一个重要的结论,该效应说明了光子在引力场中传播时会受到引力场的作用而发生偏折。引力透镜又可以分为强引力透镜、弱引力透镜以及微引力透镜,它们有时分别作为不同尺度上的研究工具,有时又会被结合在一起。Abell 1835是一个近红移(z=0.253)的星系团,它是一个典型的透镜星系团。近年来认为Abell 1835中心是一个强冷却核,其冷却时间小于当地红移处的宇宙年龄。Abell 1835的透镜效应十分明显,却也是一个相当复杂的透镜系统,2004年通过对该星系团透镜效应的研究,发现了一个迄今为止可能是离人类最遥远的星系Abell 1835-IR1916。X射线望远镜Chandra和Suzaku分别对Abell 1835进行过观测,而后Morandi、Okabe等人利用不同望远镜的X射线数据对质量轮廓进行了拟合。本文使用强引力透镜技术对Abell 1835的质量轮廓进行拟合。图像数据取自哈勃空间望远镜观测,照相机为WFPC2,滤镜为F702W。本文中选取的质量轮廓分布为伪等温椭球质量分布模型。拟合的优化方法为基于贝叶斯概率的贝叶斯方法。Abell 1835的透镜模型有一定复杂性。因此本文根据强引力透镜的研究技术,从最简单的系统情形逐步提升系统的复杂度,即选取最简单的势和像进行组合,然后根据拟合结果,再将新的势和像放入模型之中,最终得到了该系统的物理参数拟合结果,测算了该星系团的质量为M_tot=5.90±0.69 h~(-1)10~14M_solar。在最后把拟合的结果与其它文献中的拟合结果进行比较。
[Abstract]:The gravitational lensing effect is an important conclusion in general relativity. This effect shows that photons will be deflected by gravitational field when they propagate in the gravitational field.Gravitational lensing can be divided into strong gravitational lensing, weak gravitational lensing and microgravitational lensing, which are sometimes used as research tools on different scales, and sometimes combined together.It is a typical lens cluster of galaxies.In recent years, the center of Abell 1835 is considered to be a strong cooling nucleus, whose cooling time is less than that of the local redshift cosmic age. Abell 1835 lens effect is very obvious, but it is also a quite complicated lens system. In 2004, the lens effect of this cluster was studied.A galaxy, Abell 1835-IR1916.X ray telescope Chandra and Suzaku, which is probably the most distant galaxy to date, was found to have observed Abell 1835, and then Morandian Okabe et al used X-ray data from different telescopes to fit the mass profile.In this paper, the mass profile of Abell 1835 is fitted by strong gravitational lensing technique.The image data are taken from Hubble Space Telescope. The camera is WFPC2 and the filter is F702W.The mass profile distribution selected in this paper is a pseudo-isothermal ellipsoid mass distribution model.The optimization method of fitting is Bayesian method based on Bayesian probability. The lens model of Abell 1835 has some complexity.Therefore, according to the research technology of strong gravitational lensing, the complexity of the system is raised step by step from the simplest system situation, that is, the simplest potential and image are selected for combination, and then according to the fitting results, the new potential and image are put into the model.Finally, the fitting results of physical parameters of the system are obtained, and the mass of the cluster is estimated to be M_tot=5.90 卤0.69hu ~ (-1) 10 ~ (10) M _ (14) M _ (solarar).Finally, the fitting results are compared with those in other literatures.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P152

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