
TL;DR
This paper investigates the role of dust in wind-blown bubbles, modeling a specific case (N49), and suggests dust replenishment from cloudlet destruction significantly impacts bubble cooling and evolution.
Contribution
It introduces an approximate model of a dusty wind-blown bubble, highlighting dust's importance and proposing dust replenishment from cloudlets as a key process.
Findings
Dust sputtering limits dust survival to ~10^4 years.
Replenishing dust from cloudlets can explain 24 micron emission.
Including dust increases bubble luminosity and affects energy content.
Abstract
Spurred by recent observations of 24 micron emission within wind-blown bubbles, we study the role that dust can play in such environments, and build an approximate model of a particular wind-blown bubble, `N49.' First, we model the observations with a dusty wind-blown bubble, and then ask whether dust could survive within N49 to its present age (estimated to be 5x10^5 to 10^6 years). We find that dust sputtering and especially dust-gas friction would imply relatively short timescales (t ~ 10^4 years) for dust survival in the wind-shocked region of the bubble. To explain the 24 micron emission, we postulate that the grains are replenished within the wind-blown bubble by destruction of embedded, dense cloudlets of ISM gas that have been over-run by the expanding wind-blown bubble. We calculate the ablation timescales for cloudlets within N49 and find approximate parameters for the…
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