Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.377m&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
There are currently six examples of accretion disks in AGN traced by water masers. They are in the galaxies (listed in order of clarity of structure and with the binding masses in millions of solar masses in parentheses): NGC 4258 (35), NGC 1068 (17), Circinus (1), NGC 4945 (1), NGC 3079 (1), and NGC 1386 (2). The best-studied example is NGC 4258. Measurements of the proper motions and accelerations of its masers give a distance of 7.3 +- 0.3 Mpc. The strength of any toroidal magnetic field is less than 300 mG (Zeeman measurements). The absence of radio synchrotron emission from the position of the black hole indicates that any advection disk is smaller than about 100 Schwarzschild radii. Various methods of estimating the accretion rate and the constraints on theoretical models placed by measurements of the line-of-sight positions of the high-velocity features will be described.
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