Abstract
The authors propose a wind-accretion flow interaction model for the formation of extended multiple stellar shells and hot X-ray coronae around elliptical galaxies. They examine the successive interactions of a hot galactic wind with nonstationary ambient gas, which accretes onto the galaxy. The similarity solution for the interaction of a wind with accreting gas is obtained, and the authors perform the numerical simulations of the successive collisions between a wind and an accretion flow. The dark matter, the time variations of wind luminosities, and the explosive energy release from young stellar components of shells are taken into account. It is shown that multiple stellar shells actually can be produced by such successive collisions.
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