Grain Survival in Supernova Remnants and Herbig-Haro Objects | Zendy

Hideaki Mouri | Zendy; Yoshiaki Taniguchi | Zendy

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Grain Survival in Supernova Remnants and Herbig-Haro Objects

Author(s) -

Hideaki Mouri,

Yoshiaki Taniguchi

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/312633

Subject(s) - astrophysics , physics , flux (metallurgy) , supernova , ionization , grain size , gas phase , abundance (ecology) , supernova remnant , interstellar medium , phase (matter) , astronomy , materials science , ion , galaxy , thermodynamics , quantum mechanics , metallurgy , fishery , biology

By using the [Fe ii] lambda8617/[O i] lambda6300 flux ratio, we demonstrate that most of the interstellar dust grains survive in shocks associated with supernova remnants and Herbig-Haro objects. The [Fe ii]/[O i] flux ratio is sensitive to the gas-phase Fe/O abundance ratio but is insensitive to the ionization state, temperature, and density of the gas. We calculate the [Fe ii]/[O i] flux ratio in shocks and compare the results with the observational data. When only 20% of iron is in the gas phase, the models reproduce the observations most successfully. This finding is in conflict with the current consensus that shocks destroy almost all the grains and that approximately 100% of metals are in the gas phase. We comment on previous works on grain destruction and discuss why grains are not destroyed in shocks.

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