Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...39m&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p.39-39
Astronomy and Astrophysics
Astronomy
Scientific paper
The interstellar medium heated by supernovas (SN) explosions may acquire an expansion velocity larger than the escape velocity and leave the galaxy as a supersonic wind. These are indeed observed in many starburst galaxies. The effectiveness of this process depends on the heating efficiency (HE) of the SNs. In a starburst region, high SN explosions rates cause the development of a superbubble of high temperature and low density. The radiative losses of the gas are expected to be negligible and it is common to assume a value for HE close to unity. But this assumption fails in reproducing both the chemical and dynamical characteristics of several starburst galaxies. We have constructed a semi-analytical model to determine the thermalisation of the ISM inside starbursts and found that HE gets closer to 1 only after 15-20 Myrs. Furthermore, HE is strongly dependent on the initial conditions and time evolution of the ISM. In order to determine more realistic rates for the mass-loading of the ISM, we have examined SNRs-clouds interactions, through numerical simulations, and found that warm clouds (T = 104 K) are unable to change ISM density, while cold ones (T = 100 K) have a more relevant impact on its evolution.
D'Ercole Annibale
de Gouveia dal Pino Elisabete M.
Melioli Claudio
Raga A. R.
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