Ambient interstellar pressure and superbubble evolution
M.S. Oey & G. García-Segura
High ambient interstellar pressure is suggested as a possible
factor to explain the ubiquitous observed growth-rate
discrepancy for supernova-driven superbubbles and stellar wind bubbles.
Pressures of P/k ~ 1e5 cm-3 K are plausible for regions with high
star formation rates, and these values are intermediate between the
estimated Galactic mid-plane pressure and those observed in starburst
galaxies. High-pressure components also are commonly seen in Galactic
ISM localizations. We demonstrate the sensitivity of shell
growth to the ambient pressure, and suggest that superbubbles
ultimately might serve as ISM barometers.
ApJ, 613, 302
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