The dynamics of head-on collisions of spherical stellar systems

Details The dynamics of head-on collisions of spherical stellar systems The dynamics of head-on collisions of spherical stellar systems

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.128..307n&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 128, no. 2, Dec. 1986, p. 307-317.

Astronomy and Astrophysics

Astrophysics

5

Celestial Mechanics, Collisions, Galaxies, Density Distribution, Energy Distribution, Mass Ratios, Roche Limit, Stellar Mass Ejection

Scientific paper

Energy changes in a head-on collision between two unequal Plummer model stellar systems (galaxies) are studied analytically under the impulsive approximation. The variation of the disruptive effects within and the mass escape from systems widely differing in mass and scalelength ratios are determined, and some physical implications regarding the dynamical stability of the systems undergoing head-on collisions are indicated. It is found that if two systems differ considerably in size, both systems generally survive the collision if (1) the mass of the bigger is greater than about six times the mass of the smaller and (2) the density of the smaller is more than about twenty-five times the entity of the bigger system, when the velocity at minimum separation is equal to the parabolic velocity of escape.

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