your ID: 0110 
First Name: Lei 
Last Name: Qian 
Affiliation: Peking University 

Title: Influence of magnetic fields on disk evaporation processes
Authors: Qian Lei
Topic: 2 
Session: oral 
Abstract: 
Two-component spectra are often obeserved in both AGN and X-ray
binaries, which are commonly thought to be from RIAF+SSD. One of the
most promising model to interpret such a transition between SSD and RIAF
is the disk evaporation model first developed by Meyer \& Meyer-
Hofmeister (1994).  In recent years, investigations show that magnetic
fileds may play an important role in many accretion systems.

We investigate the effects of magnetic fields on the evaporation
behaviors. It is found that the radius where the maximum evaporation 
rate lies decreases with increasing strength of magnetic fileds. This implies 
that the innermost radius of the disk  at hard-soft transition decreases with 
increasing magnetic fileds. The truncation radius of the disk in the hard or
intermediate states also shows such a trend.  Our model predicts that, when
transition from hard to soft state occurs, the accretion rate is around 0.03 M_{Edd}; 
while the inner edge of the disk is between 10 R_S and 300 R_S with
different fraction of magnetic field involved, less than ~300R_S
predicted by (Meyer et al. 2000).  Both the radius and the accretion
rate at the hard-soft transition are consistent with the observations.