期刊
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷 12, 期 7, 页码 817-828出版社
NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
DOI: 10.1088/1674-4527/12/7/010
关键词
gamma rays: bursts; galaxies: jets; accretion, accretion disks; magnetic fields; jets and outflows
资金
- National Natural Science Foundation of China [11173011, 11003004, 10703002, 11143001, 11133005, 11103003]
- National Basic Research Program of China (973 Program) [2009CB824800]
- Fundamental Research Funds for the Central Universities [HUST: 2011TS159]
- China Scholarship Program
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, ORB 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.
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