Letter to the Editor
Origin of non-Keplerian motions of masers in NGC 1068
LUTh (FRE 2462 CNRS), Observatoire de Paris-Meudon, Place Jules Janssen, 92195 Meudon Cedex, France Université Paris 7 Denis Diderot, 2 Place Jussieu, 75251 Paris Cedex 05, France
Corresponding author: Jean-Marc.Hure@obspm.fr
Accepted: 2 October 2002
We demonstrate that the “sub-Keplerian” rotation curve of maser spots in NGC 1068 can be explained by the gravitational attraction of the disc orbiting the central black hole. Possible parameters matching observations are: black hole mass , disc outer edge ≳1.3 pc, aspect ratio , surface density , and disc mass . The physical conditions required for the excitation of masers are fulfilled, and the outer disc would stand in a gravitationally marginally stable state.
Key words: accretion, accretion disks / galaxies: active / galaxies: individual: NGC 1068
© ESO, 2002