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| Paper: |
Magnetic Fields in Accretion Disks of AGN: The Case of NGC 4258 |
| Volume: |
340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA |
| Page: |
192 |
| Authors: |
Modjaz, M.; Moran, J.M.; Greenhill, L.J.; Kondratko, P.T. |
| Abstract: |
We have improved the upper limit estimate on the toroidal component of the magnetic field in NGC 4258 at a radius of 0.2 pc from 300 mG (the former limit) to 50 mG. Assuming thermal and magnetic pressure balance, we estimate the accretion rate to be dM/dt/α ≤10−3.5cosΘ−2 Msolaryr−1 (where α is the viscosity parameter and Θ the angle between our line-of-sight and the B field), which is much less than the predicted value of the standard ADAF model. |
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