Discovery of the Carina Flare with NANTEN; Evidence for a Supershell That Triggered the Formation of Stars and Massive Molecular Clouds

Details Discovery of the Carina Flare with NANTEN; Evidence for a Supershell That Triggered the Formation of Stars and Massive Molecular Clouds Discovery of the Carina Flare with NANTEN; Evidence for a Supershell That Triggered the Formation of Stars and Massive Molecular Clouds

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..751f&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.751-764.

Astronomy and Astrophysics

Astronomy

28

Galaxy: Structure, Ism: Clouds, Ism: Molecules, Ism: Supernova Remnants, Stars: Formation

Scientific paper

We present extensive observations of the Carina arm region in the 2.6 mm CO (J = 1-0) emission with the NANTEN telescope in Chile. The observations have revealed 120 molecular clouds which are distributed in an area of 283deg < l < 293deg and 2deg 5 < b < 10deg. Because of its vertical elongation to the galactic plane, the clouds are named the Carina flare. H {I} and far-infrared emission show a cavity-like distribution corresponding to the molecular clouds, and soft X-ray emission appears to fill this cavity. It is shown that the Carina flare represents a supershell at a distance of a few kpc that has been produced by about 20 supernova explosions, or equivalent stellar winds of OB stars, over the last ~ 2times 107 yr. The supershell consisting of molecular and atomic neutral gas involves a total mass and kinetic energy of >~ 3times 105 M_solar and >~ 3! ! times 1050 erg, respectively, and the originally injected energy required is about 100-times this current kinetic energy in the shell. It is unique among supershells known previously because of the following aspects: i) it exhibits evidence for the triggered formation of intermediate-to-high-mass stars and massive molecular clouds of 102 - 104 M_solar , and ii) the massive molecular clouds formed are located unusually far above the galactic plane at z ~ 100 - 500 pc.

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