Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010gras.conf..299w&link_type=abstract
GRAVITATION AND ASTROPHYSICS. Proceedings of the Ninth Asia-Pacific International Conference. Held 29 June-2 July 2009 in Wuhan,
Astronomy and Astrophysics
Astrophysics
Scientific paper
The state transitions of black hole (BH) X-ray binaries are discussed based on the evolution of large-scale magnetic fields, in which the combination of three energy mechanisms are involved: (1) the Blandford-Znajek (BZ) process related to the open field lines connecting a rotating BH with remote astrophysical loads, (2) the magnetic coupling (MC) process related to the closed field lines connecting the BH with its surrounding accretion disk, and (3) the Blandford-Payne (BP) process related to the open field lines connecting the disk with remote astrophysical loads. It turns out that each spectral state of the BH binaries corresponds to each configuration of magnetic field in BH magnetosphere, and the main characteristics of low/hard (LH) state, hard intermediate (HIM) state and steep power law (SPL) state are roughly fitted based on the evolution of large-scale magnetic fields associated with disk accretion.
Huang Chang-Yin
Wang Ding-Xiong
Wang Jiu-Zhou
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