Magnetic Fields in Accretion Disks of AGN: The Case of NGC 4258

Details Magnetic Fields in Accretion Disks of AGN: The Case of NGC 4258 Magnetic Fields in Accretion Disks of AGN: The Case of NGC 4258

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..340..192m&link_type=abstract

Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA, ASP Conference Proceedings, Vol. 340. Edited

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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 dot{M}/α⪉10-3.5cosθ-2 Msun yr-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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