Physical evolution of Very Small Grains: excitation and processing in extreme environments

Details Physical evolution of Very Small Grains: excitation and processing in extreme environments Physical evolution of Very Small Grains: excitation and processing in extreme environments

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40898j&link_type=abstract

Spitzer Proposal ID #40898

Physics

Scientific paper

The nature of the dust population called the Very Small Grains (VSGs) is still poorly known. Recent studies show that they contain aromatic nanograins which could be PAH clusters, In this program, we aim at constraining the nature and size distribution of VSGs by studying their physical and chemical evolution from their initial exposure to UV radiation to their destruction in harsh UV irradiation conditions. We will use IRS in spectral mapping mode and MIPS in SED mode to study the shock-induced PDR in HH2, four extended HII regions and their interface to the Molecular cloud (Horsehead, Rosette, Carina-S, CepB-N) sampling different excitation conditions in terms of UV photon intensity and hardness. Finally we will observe the UC HII region MonR2 where extreme irradiation is prevailing. The analysis of the data will be performed by a very interdisciplinary team gathering observational, signal processing, theoretical, experimental and modelling skills to study the photophysics and chemistry of carbonaceous macromolecules and nanograins in interstellar space.

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