黑洞系統(tǒng)的大尺度磁場提能機制與準周期振蕩
[Abstract]:The radiation of dense celestial bodies such as black holes usually changes rapidly. Some x-ray light changes show a continuous and stable approximate periodicity, which is called quasi-periodic oscillation (QPO). Black hole binaries, medium mass black holes, and active galactic nucleus (AGNs) are all observed to exist QPO. QPO is considered to be an effective way to detect accretion process near a black hole because its time scale is equivalent to the dynamic time scale in the accretion disk of a black hole. Large-scale magnetic field plays an important role in high-energy astrophysics. In this paper, the 3:2 high-frequency QPO model of black hole binaries and the unified QPO model of black hole systems with different scales are established based on the large-scale magnetic field. The generation of QPO frequency is associated with the radiation spectrum. The resonance model naturally explains the small integer ratio of 3:2 high frequency QPO, but it is very difficult to overcome the damping force of accretion flow. The magnetic coupling process between the black hole and the accretion disk transfers the energy and angular momentum of the rotating black hole to the accretion disk, which overcomes the damping force of the resonant mass in the accretion flow and facilitates the establishment of the relationship between the QPO and the spectral states. In the second chapter, by combining the resonance model with the magnetic coupling process between black hole and accretion disk, the 3:2 high frequency QPO and the corresponding X ray spectrum of three black hole binary stars are fitted. It is shown that 3:2 high frequency QPO is associated with the steep power law state. Black hole binaries, medium mass black holes and AGNs show similarity and uniformity in observation. In chapter 3, we try to establish the QPO unified model of black hole systems with different scales. Under the Kerr metric, the toroidal current distribution on the accretion disk of a black hole will produce a disk-coupled closed large-scale magnetic field configuration. The interaction between the magnetic coupling process and the coronal system is considered. The magnetic reconnection of the closed magnetic field line on the disk is used to fit the QPO and the corresponding X ray spectra of three different size black hole systems respectively. The spectral state transition of black hole binary stars presents a complicated phenomenon. In chapter 4, we try to describe the state transition with the evolution of large scale magnetic field configuration, which involves the three kinds of energy raising mechanisms of BZ,MC,BP magnetic field. The power law exponent n, which describes the degree of magnetic field concentration on the disk, plays a key role. With the decrease of n, the magnetic field of the BZ and BP processes disappears successively, and the black hole binary stars transition from the low hard state to the hard intermediate state and then to the steep power law state. We fit the main characteristics of these states and estimate the time scale of the transition from the steep power law state to the thermal dominant state. The "jet line" in the HID diagram describing the transformation of black hole binary states can be well illustrated by the critical lines in a * and n parameter spaces. The emission line on the accretion disk is another effective way to detect the inner region of the disk. Because of the relativistic effect, the emission line becomes very wide when it is received by the remote observer, and the iron K 偽 line is the most obvious. If the QPO is combined with the iron K 偽 line, it is possible to make a more accurate judgment on the characteristics of the accretion disk. In chapter 5, the possible correlation between the 3:2 high frequency QPO of black hole binary stars and the broadened iron K 偽 line is discussed by using the magnetic coupling process of the large scale magnetic field. The external torque applied on the edge of the accretion disk and the helical instability of the non-axisymmetric large-scale magnetic field produced internal and external heat spots on the disk, respectively. The Kepler motion of the double hot spots formed 3:2 QPO.. On the other hand, due to the effect of the internal edge moment and the MC process of the large-scale magnetic field, the radiation on the disk is very concentrated, and the emissivity decays rapidly with the increase of the radius. The broadening profile of the iron K 偽 line calculated from the emissivity exponent is in agreement with the observed values.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2011
【分類號】:P145.8
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