Theory of the radial-orbit instability as a universal cause of structure formation in stellar systems.

Details Theory of the radial-orbit instability as a universal cause of structure formation in stellar systems. Theory of the radial-orbit instability as a universal cause of structure formation in stellar systems.

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jetpl..54..555p&link_type=abstract

JETP Lett., Vol. 54, No. 10, p. 555 - 558

Physics

Stellar Systems: Stellar Orbits, Stellar Systems: Collapse

Scientific paper

An analytic theory is derived for a basic instability of collisionless gravitating systems: the radial-orbit instability. Radial orbits arise in a natural way upon (for example) the formation of galaxies during the collapse of a stellar cloud from an initial state with an extremely low density. The theory shows that the instability occurs if the gravitational potential of the system leads to a precession of orbits with small angular momenta in the direction in which the stars are revolving in these orbits.

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