Dynamics and evolution of hot gas in early type galaxies

Details Dynamics and evolution of hot gas in early type galaxies Dynamics and evolution of hot gas in early type galaxies

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........7l&link_type=abstract

Ph.D. Thesis California Univ., Santa Cruz.

Other

Dynamics, Early Stars, Elliptical Galaxies, Galactic Evolution, High Temperature Gases, Hubble Constant, Abundance, Galactic Mass, Galactic Nuclei, Gravitational Fields, Halos, Luminosity, Supernovae, Thermal Conductivity, Time Dependence, X Ray Spectra

Scientific paper

The time-dependent equations describing galactic flows, including detailed models for the evolving source terms, are integrated over a Hubble time for two elliptical galaxies with total masses of 3.1 X 10 to the 12th and 8.3 X 10 to the 12th solar masses, 90% of which resides in extended non-luminous halos. The standard supernova rate of Tammann (1974) and a rate four times smaller are considered for each galaxy model. The combination of the extended gravitational potential of the dark halo and the time dependent source terms generally lead to the development of massive, quasi-hydrostatic, nearly isothermal distributions of gas at approximately 10 to the 7th power K with cooling inflows inside their galactic cores. For the less massive galaxy with the higher supernova rate, however, a low-luminosity supersonic galactic wind develops. The effects of a reduced metal abundance, thermal conduction, and the absence of a massive halo are explored separately for one of our models. The X-ray luminosities of the hot gas in our models with dark halos and the lower supernova rate are in excellent agreement with Einstein observations of early type galaxies.

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