Dust processing in photodissociation regions Mid-IR emission modelling of NGC2023N

Details Dust processing in photodissociation regions Mid-IR emission modelling of NGC2023N Dust processing in photodissociation regions Mid-IR emission modelling of NGC2023N

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..307c&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

This study is done in the context of dust evolution and its interaction with the gaseous phase throughout the interstellar medium evolution cycle. We focus on the mid-IR spectral variations of the dust emission across photodissociation regions, observed with both ISO and Spitzer satellites. We use a dust emission model coupled with a radiative transfer model in order to study the excitation effects on these spectral variations. We show that in NGC2023N, radiative transfer effects cannot account for the observed spectral variations. Thus, we interpret these variations in term of changes of the relative abundance between polycyclic aromatic hydrocarbons (PAHs, mid-IR bands carriers) and very small grains (VSGs, mid-IR continuum carriers). We conclude that the PAH/VSG abundance ratio is about 5 times lower in the dense deep part than in the diffuse illuminated part of the PDR where dust properties seem to be the same as in the diffuse high galactic latitude medium. Consequently, we conclude that dust must evolve from "dense properties" to "diffuse properties" at the small spatial scale of the dense illuminated ridge.

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