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The study of colliding molecular clumps evolution

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The results of study of the gravitational fragmentation in the interstellar medium (ISM) by clump-clump collisions are presented. We suggest, that collision of clumps, that are subparts of Giant Molecular Clouds (GMC) may be on of the basic mechanism, which result to ISM fragmentation and define the dynamical as well as statistical characteristics (e.g. the mass spectra) of protostellar condensation. In the present paper, we describe our 3D SPH-modeling, in isothermal approximation, of supersonic collisions of two identical clumps with a few variants of initial impact parameters (β), that cover the wide range. Our results shown, that at all β in system began intensive fragmentation. The resulting fragments mass function depend from initial impact parameter. The obtained mass spectra have the slopes in a good enough agreement with observational data for our Galaxy–especially for large impact parameters, which are more realistic as for large clumps ensembles.

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Keywords: Clumps mass spectra; Fragmentation; ISM; Molecular clouds collisions; SPH method

Document Type: Research Article

Affiliations: 1: Main Astronomical Observatory Ukrainian National Academy of Sciences, 27 Zabolotnoho str., Kiev, Ukraine, 03680 2: Astronomisches Rechen-Institut (ARI) Zentrum fur Astronomie Univ. Heidelberg (ZAH), Monchhofstrasse 12-14, 69120, Heidelberg, Germany

Publication date: 2006-08-01

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