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CO J = 10 synthesis images of a dense torus in M 2-9
J. Zweigle 1,
R. Neri 1,
R. Bachiller 2,
V. Bujarrabal 2 and
M. Grewing 1
Received 17 January 1997 / Accepted 18 February 1997
We have mapped the CO emission in the bipolar planetary nebula M 2-9 using the IRAM interferometer. From the maps we were able to investigate in detail the morphology and the kinematics of the molecular gas. The data are best explained by assuming that the molecular gas is concentrated in an expanding, clumpy torus.
The torus, which surrounds the nucleus of M 2-9, has a mean diameter of about . Its symmetry axis is tilted by with respect to the plane of the sky. The de-projected expansion velocity is , and its kinematical age is about 2100 years assuming a distance of 1 kpc. The lower limit for the total mass of the molecular gas is estimated to be , i.e. at least comparable to the ionized mass in the nebula.
Key words: planetary nebulae: general planetary nebulae: M 2-9 radio lines: ISM stars: mass loss
Send offprint requests to: J. Zweigle
© European Southern Observatory (ESO) 1997
Online publication: May 26, 1998