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
复制标题
与 NANTEN 一起发现船底座耀斑；
DOI：
10.1093/pasj/51.6.751
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发表时间：
1999
影响因子：
2.3
通讯作者：
H. Ogawa
中科院分区：
文献类型：
--
作者：
Y. Fukui;T. Onishi;R. Abe;A. Kawamura;K. Tachihara;R. Yamaguchi;A. Mizuno;H. Ogawa
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 283°<l< 293°and 2°.5 <b< 10°. Because of its vertical elongation to the galactic plane, the clouds are namedthe 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 ∼ 2×107yr. The supershell consisting of molecular and atomic neutral gas involves a total mass and kinetic energy of ≳ 3×105M⊙and ≳ 3×1050erg, 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 thetriggeredformation of intermediate-to-high-mass stars and massive molecular clouds of 102− 104M⊙, and ii) the massive molecular clouds formed are located unusually far above the galactic plane atz∼ 100–500 pc.
