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Excitation of H2 and HD in Shocks and PDRs

Published online by Cambridge University Press:  25 May 2016

F. Bertoldi ,
B. T. Draine ,
D. Rosenthal ,
R. Timmermann ,
S. K. Ramsay Howat ,
T. Geballe ,
H. Feuchtgruber  and
S. Drapatz
F. Bertoldi
Affiliation:
Max-Planck-Institut für Radioastronomie, D-53121 Bonn, Germany
B. T. Draine
Affiliation:
Princeton University Observatory, Princeton, NJ 08540, USA
D. Rosenthal
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany
R. Timmermann
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany
S. K. Ramsay Howat
Affiliation:
Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
T. Geballe
Affiliation:
Gemini Observatory, Hilo, HI 96720, USA
H. Feuchtgruber
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany
S. Drapatz
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany

Abstract

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Photodissociation regions (PDRs) and shocks give rise to conspicuous emission from rotationally and vibrationally excited molecular hydrogen. This line emission has now been studied with ISO and from the ground in great detail. A remarkable discovery has been that toward the Orion outflow and other shock-excited regions, the H2 level populations show a very high excitation component. We suggest that these high-excitation populations may arise from non-thermal pumping processes, such as H2 formation and high-velocity ion-molecule collision in partially dissociative shocks. In PDRs such as NGC 7023 however, formation pumping is always less important than fluorescent pumping.

We furthermore present two HD emission line detections toward Orion Peak 1. This enables the first comparison of the H2 and the HD excitation, which surprisingly turn out to be identical.

Type
Part 3. Outflows, Shocks, PDRs and Masers
Information
Symposium - International Astronomical Union , Volume 197: Astrochemistry: From Molecular Clouds to Planetary Systems , 2000 , pp. 191 - 201
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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