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Accretion and Outflow Traced by H2O Masers in the Circinus AGN

Published online by Cambridge University Press:  13 May 2016

L.J. Greenhill ,
J.M. Moran ,
R.S. Booth ,
S.P. Ellingsen ,
P.M. McCulloch ,
D.L. Jauncey ,
R.P. Norris ,
J.E. Reynolds ,
A.K. Tzioumis  and
J.R. Herrnstein
L.J. Greenhill
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138 USA
J.M. Moran
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138 USA
R.S. Booth
Affiliation:
Onsala Space Observatory, SE-43992 Onsala, Sweden
S.P. Ellingsen
Affiliation:
University of Tasmania, Discipline of Physics, GPO Box 252-21, Hobart, TAS 1001 Australia
P.M. McCulloch
Affiliation:
University of Tasmania, Discipline of Physics, GPO Box 252-21, Hobart, TAS 1001 Australia
D.L. Jauncey
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, NSW 2121 Australia
R.P. Norris
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, NSW 2121 Australia
J.E. Reynolds
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, NSW 2121 Australia
A.K. Tzioumis
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, NSW 2121 Australia
J.R. Herrnstein
Affiliation:
Renaissance Technologies, 600 Route 25A, E. Setauket, NY 11733 USA

Abstract

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The first VLBI images of H2O maser emission in the Circinus Galaxy AGN show both a warped, edge-on accretion disk and an outflow 0.1 to 1 pc from the central engine. The inferred central mass is 1.3 × 106 M⊙, while the disk mass may be on the order of 105 M⊙, based on a nearly Keplerian rotation curve. The bipolar, wide-angle outflow appears to contain “bullets” ejected from within < 0.1 pc of the central mass. The positions of filaments and bullets observed in the AGN ionization cone on kpc-scales suggest that the disk channels the flow to a radius of ∼ 0.4 pc, at which the flow appears to disrupt the disk.

Type
Molecules in External Galaxies
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 334 - 337
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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