Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..286u&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Computer Science
Scientific paper
In active massive star forming regions, as like star burst galaxies, sequential star formation by shock waves from supernovae, collision of molecular clouds is very important. Though such environments are assumed to be under high external pressure, self-gravitational instability of gaseous slab is incompressible and forms gravitationally stable clumps. Each of them can not form a star. To solve this problem, we suggest new star forming scenario which is merging of small mass stable clumps. We show by two-dimensional hydrodynamic simulation. When the external pressure initially exceeds critical value, created gravitationally stable clumps merge due to mutual gravitational attraction. Although each clump cannot collapse gravitationally, when its mass exceeds the Jeans mass by merging, the merged clump collapses gravitationally. In high external pressure region, we expect that the mass function of collapsing clumps in the clouds has a peak around the Jeans mass.
Matsumoto Ryo
Miyaji Shigeki
Umekawa Michihisa
Yoshida Tadashi
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