Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mcdg.proc..177m&link_type=abstract
The Magellanic Clouds and Other Dwarf Galaxies, Proceedings of the Bonn/Bochum-Graduiertenkolleg Workshop, held at the Physikzen
Other
Galactic Winds, Star Formation Burst, Superbubbles
Scientific paper
We numerically model the impact of superbubbles produced by starbursts on the gas in dwarf galaxies, using realistic gravitational potentials including the contributions from dark matter haloes, and galaxy radii based on empirical laws. We explore supernova rates from one every 30 000 yr to one every 3 million yr, equivalent to steady mechanical luminosities of L_m=0.1-10710^38 erg/s, occurring in dwarf galaxies with gas masses M_g=10^6-10^9 M-sun. We give quantitative results for when blowout will or will not occur in galaxies with 10^6<=M_g<=10^9 M-sun. Surprisingly, we find that the mass ejection efficiency is very low in such outflows for galaxies with mass M_g>=10^7 M-sun. Only galaxies with M_g<=10^6 M-sun have their interstellar gas blown away, and then virtually independently of L_m. On the other hand, metals from the supernova ejecta are accelerated to velocities larger than the escape speed from the galaxy far more easily than the gas. We find that for L_m=10^38 erg/s, about 97% of the metals are retained by a 10^9 M-sun galaxy, but this fraction is already only 40% for M_g=10^8 M-sun and decreases to 0.27% for M_g=107 M-sun.
Ferrara Andrea
Mac Low Mordecai-Mar
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