Kinematics of the cometary globules in the Gum Nebula
We report a study of the kinematics of the cometary globules in the Gum Nebula using theJ= 1 → 0 transition line of12 CO. A morphological center for the system with which 60% of the globules are associated is identified. It is shown that the observed radial velocities of the heads of the globules are consistent with an expansion of the system. Systematic velocity gradients are present along some of the tails. The estimatedexpansion age and thetail stretching age are both ∼ a few million years, suggesting a common origin for the expansion and the formation of the tails. The presence of young stars of similar ages in some of the globules points to star formation triggered by the same cause. Possible scenarios are briefly discussed.
Volume 41, 2020
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