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Asymmetric Distribution of Gas in the Large Magellanic Cloud and Dynamical Condition for Globular Cluster Formation

Mitsuaki Fujimoto, Masafumi Noguchi

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Abstract

Abstract Highly asymmetric distributions of H I and CO gases in LMC (Large Magellanic Cloud) are reproduced by taking into account hydrodynamical collision between LMC and SMC (Small Magellanic Cloud) 0.15 to 0.2 Gyr ago. Two-valued rotation curves in H I gas are due, respectively, to gas clouds accelerated by collision and to those escaped therefrom. It is also concluded that a large-scale noncircular motion of > 50 to 100 km s–1 and a resultant compression of > 104 M⊙ in mass-scale are necessary conditions for globular cluster formation from interstellar gas. This process seems to be independent of the chemical abundance of heavy elements in the range –2.0 < [Fe/H] < 0.

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Abstract Highly asymmetric distributions of H I and CO gases in LMC (Large Magellanic Cloud) are reproduced by taking into account hydrodynamical collision between LMC and SMC (Small Magellanic Cloud) 0.15 to 0.2 Gyr ago. Two-valued rotation curves in H I gas are due, respectively, to gas clouds accelerated by collision and to those escaped therefrom. It is also concluded that a large-scale noncircular motion of > 50 to 100 km s–1 and a resultant compression of > 104 M⊙ in mass-scale are necessary conditions for globular cluster formation from interstellar gas. This process seems to be independent of the chemical abundance of heavy elements in the range –2.0 < [Fe/H] < 0.

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Available abstract

Abstract Highly asymmetric distributions of H I and CO gases in LMC (Large Magellanic Cloud) are reproduced by taking into account hydrodynamical collision between LMC and SMC (Small Magellanic Cloud) 0.15 to 0.2 Gyr ago. Two-valued rotation curves in H I gas are due, respectively, to gas clouds accelerated by collision and to those escaped therefrom. It is also concluded that a large-scale noncircular motion of > 50 to 100 km s–1 and a resultant compression of > 104 M⊙ in mass-scale are necessary conditions for globular cluster formation from interstellar gas. This process seems to be independent of the chemical abundance of heavy elements in the range –2.0 < [Fe/H] < 0.

Key concepts: Physics, Globular cluster, Astrophysics, Large Magellanic Cloud, Humanities, Stars, Philosophy

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