A Study of the Southern Star Formation with a 4m Radio Telescope

interstellar molecular cloud is one of The most important astronomical objects to study Theformation of stars and stellar clusters and volution of galaxies. Through this program，我们已经看到了许多新的观点，molecular clouds in the southern sky. in the following，我们summarize a part of the results.1.发现molecular super-shell candidates：15 candidates of molecular super-shell similar to “Carina Flare”a huge supershell formed by ~ 20 of supernova explosions. In the Centaurus region，the shell-candidates show good spatial correlation with the massive star forming regions. Thisobservationally indicates that the supernova explosion plays an important role in recycling theinterstellar matter between the galactic plane and halo as theoretical astronomers suggested.2.详细研究molecular gas in the Vela supernova remnant (SNR)：我们made detailed observation of molecular gas toward the nearest SNR，Vela SNR. The CO intensity distribution shows good correlation with those of X-ray，optical emission, and HI emissionsuggesting the SNR and molecular gas occurs in many places in the SNR。This result has an impact on the study of the evolution of SNRs and physical process of the ionizedshock front.Discovery of small molecular clouds associated with the super giant shell in the LMC：We identified many molecular clouds with the super giant 10 . We identified many molecular clouds with the super giantshell,LMC4和5 in the LMC. Stellar clusters and HII regions tend to be located on the side facing to theshell in those small clouds. in addition, between the LMC 4 and 5，there are massive clouds having 10 . D16 . D1 solar-masses. These results suggest that most of thenewly identified clouds are formed as a result of compression by the expanding shell，leading to form stars in them，and that the shell itself grows by the supernova explosions of the newly formed stars。

The interstellar molecular cloud is one of the most important astronomical objects to study the formation of stars and stellar clusters and evolution of galaxies. Through this program, we obtained many new views of molecular clouds in the southern sky. In the following, we summarize a part of the results.1. Discovery of molecular super-shell candidates : We have found 〜15 candidates of molecular super-shell similar to "Carina Flare", a huge super-shell formed by 〜20 of supernova explosions. In the Centaurus region, the shell-candidates show good spatial correlation with the massive star forming regions. This observationally indicates that the supernova explosion plays an important role in recycling the interstellar matter between the galactic plane and halo as theoretical astronomers suggested.2. Detailed study of molecular gas in the Vela supernova remnant (SNR) : We made detailed observation of molecular gas toward the nearest SNR, Vela SNR. The CO intensity distribution shows good correlation with those of X-ray, optical emission, and HI emission, suggesting that the interaction between the SNR and molecular gas occurs in many places in the SNR. This result has an impact on the study of the evolution of SNRs and physical process of the ionized shock front.Discovery of small molecular clouds associated with the super giant shell in the LMC : We identified many molecular clouds with 10ィイD15ィエD1 solar-masses associated with the super giant shell, LMC4 and 5 in the LMC. Stellar clusters and HII regions tend to be located on the side facing to the shell in those small clouds. In addition, between the LMC 4 and 5, there are massive clouds having 10ィイD16ィエD1 solar-masses. These results suggest that most of the newly identified clouds are formed as a result of compression by the expanding shell, leading to form stars in them, and that the shell itself grows by the supernova explosions of the newly formed stars.