Ram pressure stripping from elliptical galaxies. I - The mass contained in the Galaxy

Details Ram pressure stripping from elliptical galaxies. I - The mass contained in the Galaxy Ram pressure stripping from elliptical galaxies. I - The mass contained in the Galaxy

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...86...95p&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 86, no. 1, p. 95-131.

Astronomy and Astrophysics

Astrophysics

24

Elliptical Galaxies, Galactic Clusters, Galactic Mass, Pressure Distribution, Two Fluid Models, Gas Temperature, Shock Fronts, Stellar Mass Ejection, Temperature Distribution, Velocity Distribution

Scientific paper

The physical assumption and the basic hydrodynamic equations of the ram pressure stripping model are examined for elliptical galaxies in clusters of galaxies. The formation of a bow shock in a cluster galaxy is found to be due to the replenished gas from stellar mass loss. The velocity dispersion of the galaxy stars strongly influences the injection temperature of the replenished gas. Physical conditions are such that the time scale for proton-electron equilibration may be longer than the dynamical one, and a two-fluid model of the plasma is needed. The velocity at infinity has a weak effect on the amount of gas the galaxy contains, but it determines the efficiency of ram pressure stripping. The cluster environment parameters only weakly affect the amount of mass contained in the galaxy. The stellar density distribution has a major effect on that mass. Simple fitting formulas are given for the amount of mass in the galaxy as a function of the external and internal parameters.

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