What are molecular clouds? - PDRS everywhere

Details What are molecular clouds? - PDRS everywhere What are molecular clouds? - PDRS everywhere

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe..95o&link_type=abstract

"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782

Astronomy and Astrophysics

Astrophysics

5

Modelling_Environments

Scientific paper

We propose that the concept of molecular clouds needs to be questioned. Most interstellar gas is only partially molecular and the spatial distribution varies between different species. Ubiquitous interstellar turbulence creates fractal cloud structures allowing a deep UV penetration so that most material can be described in the concept of photon-dominated regions (PDRs). Most cloud structures are transient, created and destroyed by large-scale turbulence on relatively short timescales. A steady-state chemistry applies only to dense cloud cores while for most of the material the history of the chemical evolution needs to be taken into account. The effect of density fluctuations, turbulent transport, mixing and dissipation needs to be incorporated in time-dependent PDR models to provide a realistic picture of molecular clouds.

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