Shattering and coagulation of dust grains in interstellar turbulence

摘要: We investigate shattering and coagulation of dust grains in turbulent interstellar medium (ISM). The typical velocity grain as a function size has been calculated for various ISM phases based on theory dynamics compressible magnetohydrodynamic turbulence. In this paper, we develop scheme apply it to by using the velocities predicted above turbulence theory. Since large tend acquire dispersions shown earlier studies, be shattered. Large effects are indeed seen warm ionized within few Myr with radius 10 −6 cm. also show that neutral can limit largest (a ∼ 2 × −5 cm). On other hand, tends modify small since only occurs when is enough. Coagulation significantly modifies distribution dense clouds (DC), where fraction < cm coagulate Myr. fact, correlation among RV , carbon bump strength ultraviolet slope observed Milky Way extinction curves explained DC. It possible determined combination all coagulation. Considering effective if dust-to-gas ratio typically more than ∼1/10 Galactic value, regulation mechanism should different between metal-poor metal-rich