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1. Stochastic Electron Acceleration in SNR RX J1713.7-3946 | |||
Fan Zhonghui,Liu Siming | |||
Astronomy 31 December 2011 | |||
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Abstract:Stochastic acceleration of charged particles due to their interactions with plasma waves may be responsible for producing superthermal particles in a variety of astrophysical systems. This process can be described as a diffusion process in the energy space with the Fokker-Planck equation. In this paper, a time-dependent numerical code is used to solve the reduced Fokker-Planck equation involving only time and energy variables with general forms of the diffusion coefficients. We also propose a self-similar model for particle acceleration in Sedov explosions and use the TeV SNR RX J1713.7-3946 as an example to demonstrate the model characteristics. Markov Chain Monte Carlo method is utilized to constrain model parameters with observations. | |||
TO cite this article:Fan Zhonghui,Liu Siming. Stochastic Electron Acceleration in SNR RX J1713.7-3946[OL].[31 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4458565 |
2. A Toy Model for 3:2:1 Ratio of HFQPOs in XTE J1550-564 | |||
Yong-Chun Ye,Chang-Yin Huang,Wei-Hua Lei,Ding-Xiong Wang | |||
Astronomy 21 September 2009 | |||
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Abstract:Based on a toy model of coexistence of the Blandford-Znajek (BZ) and magnetic coupling (MC) processes with a non-axisymmetric magnetic field, we explain a puzzling 3:2:1 ratio of the high-frequency Quasi-Periodic Oscillation (HFQPO) in XTE J1550-564. It turns out that two frequencies of the HFQPO can be fitted by two rotating magnetic hotspots arising from the MC process, and the other HFQPO frequency is related to a magnetic hotspot produced in the BZ process. Based on the block of the medium shell surrounding a black hole we discuss the astrophysical environment required by the transition between low/hard (LH) and steep power-law (SPL) states and the association of jet and HFQPOs with the LH and SPL states observed in XTE J1550-564. | |||
TO cite this article:Yong-Chun Ye,Chang-Yin Huang,Wei-Hua Lei, et al. A Toy Model for 3:2:1 Ratio of HFQPOs in XTE J1550-564[J]. |
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