潮汐撕裂事件候选体各物理参量的分析研究

发布时间：2018-01-20 02:37

本文关键词： 潮汐撕裂事件吸积闪耀黑洞　出处：《南京师范大学》2014年硕士论文　论文类型：学位论文

【摘要】：当恒星经过超大质量黑洞附近,进入到撕裂半径之内时,恒星会被黑洞撕裂,一部分恒星残骸物质会被黑洞束缚向近日点回流,并最终被黑洞吸积,在这个过程中产生紫外或者X射线闪耀。潮汐撕裂事件常被用来证实沉寂星系中心存在超大质量黑洞。通常理论认为闪耀之后光变以t-5/3幂律下降,但是近期的模拟发现早期光变应当偏离该幂律,我们对十二例潮汐撕裂事件的光学和X射线光变进行了拟合,证实了模拟结果,即大部分潮汐撕裂事件的光变偏离了该幂律。我们还计算了十例潮汐撕裂事件的各物理参量,包括穿透因子μ、被撕裂恒星的质量M*、黑洞质量MBH。我们对穿透因子、光变幂律指数因子和被撕裂恒星质量作了统计分析,尽管样本数量偏少,但是仍然可以看出这三者存在明显的关联。通过这些研究,期望以后随着样本量的增加可以确定上述物理参数的关联性,同时提高我们对恒星动力学、超爱丁顿吸积物理学、大质量黑洞的统计及潮汐撕裂事件在大质量黑洞增长中的作用的了解。
[Abstract]:When a star passes near a supermassive black hole, entering within the tearing radius, the star is torn by the black hole, and some of the stellar debris material is bound back to the perihelion by the black hole and eventually accreted by the black hole. During this process, ultraviolet or X-ray sparkles are produced. Tidal tearing events are often used to confirm the existence of supermassive black holes in the center of silent galaxies. However, recent simulations show that the early light variation should deviate from the power law. We have fitted the optical and X-ray variations of 12 tidal tearing events, and verified the simulation results. That is, the light variation of most tidal tearing events deviates from the power law. We also calculate the physical parameters of ten tidal tearing events, including the penetration factor 渭, and the mass M * of the torn star. The mass of black hole MBH. We have made a statistical analysis of the penetration factor, the exponent factor of the power law of light change and the mass of the torn star, although the sample size is small. Through these studies, it is expected that the correlation of the above physical parameters can be determined with the increase of sample size, and that we can improve our stellar dynamics at the same time. Super Eddington accretion physics, statistics of massive black holes and understanding of the role of tidal tearing events in the growth of massive black holes.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P145.8

【相似文献】