ISO looks at shocks and photodissociation regions

Details ISO looks at shocks and photodissociation regions ISO looks at shocks and photodissociation regions

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..120b&link_type=abstract

The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb

Physics

Scientific paper

Photodissociation regions (PDRs) and shocks reprocess much of the energy output from massive stars, re-emitting the energy at other wavelengths, including a rich mixture of infrared lines. ISO enabled the first detailed observation of important atomic and molecular infrared emission lines that reveal the physical conditions in the dense gas near young, massive stars. The pure rotational transition lines of H _2 are the most important among those lines, as they probe the density and temperature of the emitting gas. We discuss their significance with the examples of the S140 PDR and the Orion Peak 1 outflow region. The large number of observed H _2 lines in Orion Peak 1 also permits an estimate of the dust extinction curve in the mid-infrared. We also detected here a rotational transition line of HD, from which we derive a deuterium abundance of (8+/- 3) times 10^{-6}.

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