Origin of non-Keplerian motions of masers in NGC 1068

J.-M. Huré

doi:10.1051/0004-6361:20021445

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Volume 395 / No 2 (November IV 2002)

A&A, 395 2 (2002) L21-L24

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Issue		A&A Volume 395, Number 2, November IV 2002


Page(s)		L21 - L24
Section		Letters
DOI		https://doi.org/10.1051/0004-6361:20021445
Published online		14 November 2002

A&A 395, L21-L24 (2002)

Letter to the Editor

Origin of non-Keplerian motions of masers in NGC 1068

J.-M. Huré

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

Received: 14 August 2002
Accepted: 2 October 2002

Abstract

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 $\simeq$ $(1.2 \pm 0.1) \times 10^7~M_\odot$ , disc outer edge ≳1.3 pc, aspect ratio $3 \times 10^{-3} \lesssim \frac{H}{R} \lesssim 0.3$ , surface density $\Sigma \propto R^{-1.05 \pm 0.10}$ , and disc mass $\simeq$ $(9.4 \pm 1.6) \times 10^6~M_\odot$ . 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

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