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Protostellar Cores Formation in the Collision of Spherical and Oblate Clouds

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Abstract

The formation of new star systems most often occurs in molecular clouds, dense filamentary structures, and Bok globules. The increase in density to prestellar values in such structures is caused by hydrodynamic shock interactions. In this paper, a study was conducted to investigate the impact of the interaction between molecular clouds of varying shapes, radius, and density distribution over the radius. A new three-dimensional program was tested, in which a high-resolution PPM method was applied. In addition, the analytical solutions of the Poisson equation were compared to the calculation of the gravitational potential for a centrally condensed sphere, as well as the Chandrasekhar solution for an ellipsoid. The convergence of analytical and numerical solutions is demonstrated. Calculations of collisions of spherical and elliptical molecular clouds were carried out. The simulation showed that the results of the interaction depend on several factors: the initial velocity of the collision, the mass of clouds, the law of density distribution over the radius and clouds shape. Supersonic turbulence is one of the main reasons for the formation of dynamic prestellar structures. The evolution of superdense substances formation begins when they gather in turbulent flows or are formed by supersonic collisions between molecular clouds. This process continues until these areas reach the density required for star formation. Depending on various factors, these superdense formations can either collapse and form new star systems or disintegrate, returning the substance to the interstellar medium.

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Funding

Theoretical and numerical simulations were performed using the facilities of Scientific Research Institute for System Analysis RAS and supported by the subsidy (no. FNEF-2022-0021).

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  1. National Science Center Kurchatov Institute, Federal Science Center Scientific Research Institute for System Analysis, Moscow, Russia

    B. P. Rybakin

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Correspondence to B. P. Rybakin.

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Rybakin, B.P. Protostellar Cores Formation in the Collision of Spherical and Oblate Clouds. Lobachevskii J Math 45, 95–107 (2024). https://doi.org/10.1134/S1995080224010463

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  • DOI: https://doi.org/10.1134/S1995080224010463

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