A two-component jet model based on the Blandford-Znajek and Blandford-Payne processes  

作　　者：Wei Xie Wei-Hua Lei Yuan-Chuan Zou Ding-Xiong Wang Qingwen Wu Jiu-Zhou Wang 

机构地区：[1]School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China [2]Department of Physics and Astronomy, University of Nevada Las Vegas, 4505 MarylandParkway, Box 454002, Las Vegas, NV89154-4002, USA

出　　处：《Research in Astronomy and Astrophysics》2012年第7期817-828,共12页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11173011, 11003004,10703002, 11143001, 11133005 and 11103003);the National Basic Research Program of China(973 Program, 2009CB824800);Fundamental Research Funds for the Central Universities(HUST: 2011TS159)

摘　　要：We propose a two-component jet model consistent with the observations of several gamma ray bursts （GRBs） and active galactic nuclei （AGNs）. The jet consists of inner and outer components, which are supposed to be driven by the Blandford- Znajek （BZ） and Blandford-Payne （BP） processes, respectively. The baryons in the BP jet are accelerated centrifugally via the magnetic field anchored in the accretion disk. The BZ jet is assumed to be entrained in a fraction of accreting matter leaving the inner edge of the accretion disk, and the baryons are accelerated in the conversion from electromagnetic energy to kinetic energy. By fitting the Lorentz factors of some GRBs （GRB 030329, GRB 051221A and GRB 080413B） and AGNs （Cen A, Mkn 501 and Mkn 421） with this model, we constrain the physical parameters related to the accretion and outflow of these two kinds of objects. We conclude that the spine/sheath structure of the jet from these sources can be interpreted naturally by the BZ and BP processes.We propose a two-component jet model consistent with the observations of several gamma ray bursts （GRBs） and active galactic nuclei （AGNs）. The jet consists of inner and outer components, which are supposed to be driven by the Blandford- Znajek （BZ） and Blandford-Payne （BP） processes, respectively. The baryons in the BP jet are accelerated centrifugally via the magnetic field anchored in the accretion disk. The BZ jet is assumed to be entrained in a fraction of accreting matter leaving the inner edge of the accretion disk, and the baryons are accelerated in the conversion from electromagnetic energy to kinetic energy. By fitting the Lorentz factors of some GRBs （GRB 030329, GRB 051221A and GRB 080413B） and AGNs （Cen A, Mkn 501 and Mkn 421） with this model, we constrain the physical parameters related to the accretion and outflow of these two kinds of objects. We conclude that the spine/sheath structure of the jet from these sources can be interpreted naturally by the BZ and BP processes.

关 键 词：gamma rays： bursts -- galaxies： jets -- accretion accretion disks --magnetic fields -- jets and outflows 

分 类 号：P157.7[天文地球—天文学] TQ633[化学工程—精细化工]