Heating the Gas in Photodissociation Fronts
Draine, B. T. · Bertoldi, F.
Original · EN
ISO has provided us with a new perspective on gas temperatures in photodissociation regions through measurements of line emission from rotationally-excited levels of the H₂ molecule. The H₂ rotational level populations provide a thermal probe, showing that gas temperatures Tgas approx 500-1000 K prevail in a portion of the PDR where significant quantities of H₂ are present. Such high gas temperatures were unexpected. Theoretical models for the S140 PDR are presented. Possible mechanisms for heating the gas to such high temperatures are discussed.
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