Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397...32m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 32-37.
Astronomy and Astrophysics
Astrophysics
60
Astronomical Models, Chemical Evolution, Cooling Flows (Astrophysics), Dark Matter, Elliptical Galaxies, Galactic Evolution, Interstellar Matter, Star Formation, Stellar Luminosity, Supernovae
Scientific paper
We have computed detailed models for the chemical evolution of elliptical galaxies in the presence of dark matter. These models assume that a galactic wind develops as a result of the energy injection into the gas by supernovae, and that no star formation takes place afterward. We have found that the occurrence of galactic winds is strongly affected by the presence of dark matter if this is distributed like the luminous one. The net effect is that elliptical galaxies develop winds very late, leading to quite different results with respect to the standard models, where galactic winds occur not later than 1 Gyr and which account for most of the observed properties of nearby ellipticals. On the other hand, if the dark matter is distributed in a diffuse halo, the results differ only slightly from the standard ones. In particular, the models with the diffuse dark halo predict slightly longer times for the onset of galactic winds and the predicted metallicities are also slightly higher. We conclude suggesting that if dark matter exists in ellipticals, it is likely to be distributed in a diffuse halo and that its influence on the chemical evolution of the luminous matter is almost negligible.
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