Dust Destruction in the High-Velocity Shocks Driven by Supernovae in the Early Universe

摘要: We investigate the destruction of dust grains by sputtering in high-velocity interstellar shocks driven supernovae(SNe)intheearlyuniversetorevealthedependenceofthetimescaleofdustdestructiononthegasdensity nH;0 medium (ISM), as well on progenitor mass Mpr and explosion energy E51 SNe. The yields for combinations ion species interest to us are evaluated applying so-called universalrelationwithaslightmodification.Thedynamicsofdustgrainsandtheirdestructionbysputteringinshocks calculated taking into account size distribution each species, together with time evolution temperature density gas spherically symmetric shocks. results calculations show that efficiency depends not only yield but also initial grain species. increases increasing and/or is almost independent long same. swept up a shock an function andadecreasingfunctionof nH;0.Combiningtheseresults,wepresenttheapproximationformulaforthetimescaleof early universe nH;0. This formula applicable investigating at epoch metallicity Z P10 � 3 Z� . effects cooling processes briefly discussed. Subject headingg dust, extinction — waves supernova remnants supernovae: general Online material: color figures