Dust destruction in the ISM: a re-evaluation of dust lifetimes

Details Dust destruction in the ISM: a re-evaluation of dust lifetimes Dust destruction in the ISM: a re-evaluation of dust lifetimes

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...530a..44j&link_type=abstract

Astronomy & Astrophysics, Volume 530, id.A44

Astronomy and Astrophysics

Astrophysics

11

Ism: Abundances, Dust, Extinction

Scientific paper

Context. There is a long-standing conundrum in interstellar dust studies relating to the discrepancy between the time-scales for dust formation from evolved stars and the apparently more rapid destruction in supernova-generated shock waves. Aims: We re-examine some of the key issues relating to dust evolution and processing in the interstellar medium. Methods: We use recent and new constraints from observations, experiments, modelling and theory to re-evaluate dust formation in the interstellar medium (ISM). Results: We find that the discrepancy between the dust formation and destruction time-scales may not be as significant as has previously been assumed because of the very large uncertainties involved. Conclusions: The derived silicate dust lifetime could be compatible with its injection time-scale, given the inherent uncertainties in the dust lifetime calculation. The apparent need to re-form significant quantities of silicate dust in the tenuous interstellar medium may therefore not be a strong requirement. Carbonaceous matter, on the other hand, appears to be rapidly recycled in the ISM and, in contrast to silicates, there are viable mechanisms for its re-formation in the ISM.

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