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Formation and Structure of High-z quasars

高z类星体的形成和结构

基本信息

批准号：
08640329
负责人：
MINESHIGE Shin
金额：
$ 1.54万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640329/
关键词：
quasar black hole accretion disks radiation drag gravitational instunility self-similar solutious

项目摘要

According to the standard scenario for structural formation, rotating dark-matter disks with mass of about 10^7 solar masses are expected to form at high red-shifts (z-several hundreds). Whether such disks would evolve to quasars depend on later disk evolution. To discuss the disk evolution under the influence of viscosity and selt-gravity, we have seeked for self-similar solutions and could find them. We have also examined how Compton drag due to background radiation affect viscous disk evolution, finding that drag and viscosity actually reinforce each other, thereby rapid disk collapse being promoted. Now the possibility to form a proto-quasar black hole by such a massive self-gravitating disk has become realistic.We have also found a novel method to observationally resolve the central structure of high redshift quasars. This is to use the so-called gravitational microlensing ; namely, when stars pass by the image of a quasar, radiation from a tiny portion will selectively be amplified. We have in fact apply this method to Einstein Cross (Q02237), finding that emission properties of the disk around a putative black hole will be resolved on spatial scales down to several Schwarzschild radii. We now await until such observations will be performed.

根据结构形成的标准设想，质量约为10^7太阳质量的旋转暗物质盘预计将在高红移（z-几百）处形成。这些盘状物是否会演化成类星体取决于后来的盘状物演化。为了讨论在粘性和自引力影响下的盘演化，我们一直在寻找自相似解，并且能够找到它们。我们还研究了背景辐射引起的康普顿阻力如何影响粘性盘的演化，发现阻力和粘性实际上是相互加强的，从而促进了盘的快速坍缩。现在，由这样一个大质量的自引力盘形成原类星体黑洞的可能性已经成为现实，我们也找到了一种新的方法来观测解决高红移类星体的中心结构。这是利用所谓的引力微透镜效应;也就是说，当恒星经过类星体的图像时，来自一小部分的辐射将被选择性地放大。事实上，我们已经将这种方法应用于爱因斯坦十字架（Q 02237），发现一个假定的黑洞周围的盘的发射特性将在几个史瓦西半径的空间尺度上得到解决。我们现在等待，直到这样的观察将被执行。