'Hot' model for the formation of galaxies - The sizes of galaxies and the origin of the stellar component

Astronomy and Astrophysics – Astronomy

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Astronomical Models, Galactic Evolution, High Temperature Gases, Star Formation, Stellar Systems, Dark Matter, Globular Clusters, Stellar Mass, Thermal Instability

Scientific paper

A mechanism by which a protogalaxy transforms into a stellar system is proposed in the framework of the hot model of galaxy formation. The mechanism gives a quantitative relation between the mass and size of the galaxy which agrees well with the observational relation; it also specifies two characteristic mass values which coincide with masses of stars and globular clusters. It is shown that a hot protogalaxy (T = 10 to the 7th K) contracting under the gravity of a massive dark halo attains a critical size and fragments into separate clouds via thermal instability.

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