大尺度磁场、黑洞自转以及吸积率对吸积盘喷流的影响

Jets are discovered in various astrophysical systems. The theory of jets, which is very important to astrophysics, is still unclear at present. We will systemically take three factors in disk models, i.e., black hole spin, magnetic field and accretion rate, into account to investigate their impact on the jets accelerated from accretion disk. Detailedly, we will study the global dynamics of advection-dominated accretion flows with magnetically driven outflow around a Kerr black holes; Whether the black hole spin can play a key role in jets and which one (BZ or BP) dominates the jet power are still arguable subject, our research can help to solve this problem. Still further, we will compare our results with those of observation and other models, such as the model of Meier (1999). We will study the influence of the large-scale magentic field threading in the accretion disk on the continuum-fitting method measuring the black hole spin, study the effects of magnetic field playing on BZ and BP mechanisms. At last, we will investigate the correlation between jet power and accretion rate (bolometric luminosity) in FRII radio galaxies and check the validity of the usual treatment supposed the magentic pressure in the accretion disk to be proportional to gas pressure (+radiation pressure).

喷流广泛地存在于各种天体物理系统中，对喷流的研究在天体物理中有着非常重要的意义。但在理论和观测两方面，喷流的研究都还存在着不少问题。本项目将考虑理论模型中影响喷流的三个因素：黑洞自转、磁场和吸积率，并结合观测来系统地研究它们对喷流大小的影响。研究科尔度规下包含磁场加速外流的径移主导吸积流的整体解；综合研究黑洞自转对喷流大小的影响、研究BZ和BP机制究竟谁占主导并与Meier（1999）的结果以及观测相比较；研究大尺度磁场对黑洞自转测量的影响，这将有助于提高黑洞自转测量的精度；利用MHD数值模拟的结果来研究磁场对BZ和BP机制的影响；研究FRII中喷流功率和吸积率之间的相关性，从观测上检验通常假设吸积盘中磁压与气体压（+辐射压）成比例这一做法的正确性。

喷流广泛地存在于各种天体物理系统中，对喷流的研究在天体物理中有着非常重要的意义。但在理论和观测两方面，喷流的研究都还存在着不少问题。本项目考虑理论模型中影响喷流的三个因素：黑洞自转、磁场和吸积率，并结合观测来系统地研究它们对喷流大小的影响。我们研究了大尺度磁场、黑洞自转对吸积盘、喷流的影响，发现大尺度磁场所产生的盘风可以使得吸积盘的温度大大降低，有助于解释射电星系中的高效率喷流现象；此外，我们还研究了射电宁静类星体光变的观测数据及理论模型，有助于理解吸积盘的物理过程；研究了低光度活动星系核的吸积模式，支持了ADAF模型为低光度活动星系核的中心引擎；研究了盘冕模型对类星体辐射谱的影响并用来限制黑洞的自转。