Distribution and Kinematics of the Molecular Clouds in the Gum Nebula

Details Distribution and Kinematics of the Molecular Clouds in the Gum Nebula Distribution and Kinematics of the Molecular Clouds in the Gum Nebula

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..765y&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.765-774.

Astronomy and Astrophysics

Astronomy

21

Ism: Individual (Gum Nebula), Ism: H {Ii} Regions, Ism: Kinematics And Dynamics, Ism: Molecules, Radio Lines: Ism

Scientific paper

We have made an extensive search for molecular gas toward the Gum Nebula in the J=1-0\ 12CO emission at 2.6 mm. The 12CO distribution has been used to identify 82 molecular clouds at |b| > 5deg, including those toward optically visible cometary globules which are likely to be associated with the Nebula. Their velocity is significantly deviated from the galactic rotation and the velocity dispersion is as large as ~ 20\ km\ s-1, indicating that they are expanding under the dynamical effects of OB stars and/or supernova explosions. The total mass of these molecular clouds is estimated to be ~ 1.7 x 104 M_sun, corresponding to ~ 10 % of the H {I} gas associated with the nebula. Most of these molecular clouds are well explained as part of a supershell of ~ 70-130 pc radius that is expanding at 10-15 km\ s-1. The total kinetic energy of this shell will require a total energy deposit of ~ (2.1-4.7) times 1050 erg as the stellar winds and/or the supernova explosions. The massive stars in this region are quantitatively examined as candidates that have supplied this energy.

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