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A toy model for X-ray spectral variability of active galactic nuclei
Xinwu Cao, Jun-Xian Wang
The long term X-ray spectral variability of ten active galactic nuclei (AGN) shows a positive spectral index-flux correlation for each object (Sobolewska & Papadakis 2009). An inne…
Episodic jet power extracted from a spinning black hole surrounded by a neutrino-dominated accretion flow in gamma-ray bursts
Xinwu Cao, En-Wei Liang, Ye-Fei Yuan
It was suggested that the relativistic jets in gamma-ray bursts (GRBs) are powered via the Blandford-Znajek (BZ) mechanism or the annihilation of neutrinos and anti-neutrinos from…
The outflows accelerated by the magnetic fields and radiation force of accretion disks
Xinwu Cao
The inner region of a luminous accretion disk is radiation pressure dominated. We estimate the surface temperature of a radiation pressure dominated accretion disk, Θ=(c_s/rΩ_K)^2<…
Constraints on black hole spins with a general relativistic accretion disk corona model
Bei You, Xinwu Cao, Ye-Fei Yuan
The peaks of the spectra of the accretion disks surrounding massive black holes in quasars are in the far-UV or soft X-ray band, which are usually not observed. However, in the dis…