Gas to dust interaction studies with the ISO data base

Details Gas to dust interaction studies with the ISO data base Gas to dust interaction studies with the ISO data base

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..199h&link_type=abstract

Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by

Astronomy and Astrophysics

Astronomy

Scientific paper

Several processes couple dust to the chemical and thermodynamical evolution of the interstellar gas. The ISO data allows us for the first time to conduct a detailed study of this interplay over a wide range of gas density and radiation field strength. Detailed confrontation between ISO observations of both gas and dust emission from the nearest photon-dominated regions (PDRs) of the ISM with model predictions allows us to constrain important processes coupling gas to dust such as the photoelectric heating on dust grains (Habart et al. 2001A&A...373..702H), or the formation of H2 on grain surfaces (Habart et al. 2003A&A...397..623H).
An important issue raises by ISO concerning our understanding of the local microphysics of the ISM is the high gas temperature (Tgas˜300-700 K) observed towards several PDRs. In this context, our description of the main physical and chemical processes involving PDRs has to be reconsidered. For dense PDRs (nH >˜ 104 cm-3) exposed to moderate radiation field (100 <= χ <= 103), a high H2 formation rate (Rf >= 10-16 cm3 s-1 at Tgas >= 350 K) seems to be required to explain the observed H2 excitation.

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