Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-03T07:56:11.206Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Beckwith, S., Persson, S., Neugebauer, G., & Becklin, E. 1978, ApJ, 223, 464 CrossRefGoogle Scholar
Bertoldi, F. 1997, in Proceedings of the first ISO workshop on Analytical Spectroscopy, eds. Heras, A.M. et al. (Noordwijk: ESA Publications Division, ESA SP-419), 67 Google Scholar
Bertoldi, F., Draine, B.T., Drapatz, S., Rosenthal, D., Timmermann, R., & Wright, C.M. 1999, in The Physics and Chemistry of the Interstellar Medium, eds. Ossenkopf, V. et al. (GCA-Verlag Herdecke)Google Scholar
Bertoldi, F., Timmermann, R., Rosenthal, D., Drapatz, S., & Wright, C.M. 1999, A&A, 346, 267 Google Scholar
Black, J. & van Dishoeck, E.F. 1987, ApJ, 322, 412 CrossRefGoogle Scholar
Burton, M., Bulmer, M., Moorhouse, A., Geballe, T.R., & Brand, P.W.J.L. 1992, MNRAS, 257, 1 CrossRefGoogle Scholar
Chièze, J.-P., Pineau des Forêts, G., & Flower, D. 1998, MNRAS, 295, 672 Google Scholar
Draine, B.T. & Bertoldi, F. 1996, ApJ, 468, 269 Google Scholar
Draine, B.T. & Bertoldi, F. 1999, in The Universe as seen by ISO, eds. Cox, P. & Kessler, M.F. (ESA SP-427) Google Scholar
Draine, B.T. & Bertoldi, F. 2000, in H2 in Space, eds. Combes, F. & Pineau des Forêts, G., Cambridge University Press Google Scholar
Duley, W.W. & Williams, D.A. 1986, MNRAS, 223, 177 CrossRefGoogle Scholar
Duley, W.W. & Williams, D.A. 1993, MNRAS, 260, 37 CrossRefGoogle Scholar
Flower, D. & Pineau des Forêts, G. 1999, MNRAS, 308, 271 CrossRefGoogle Scholar
Fuente, A., Martín-Pintado, J., Rodriguez-Fernandez, N.J., de Vicente, P., & Kunze, D. 1999, ApJ, 518, L45 CrossRefGoogle Scholar
Hollenbach, D.J. & McKee, C.F. 1989, ApJ, 342, 306 Google Scholar
Hollenbach, D.J. & Tielens, A.G.G.M. 1997, ARA&A, 35, 179 Google Scholar
Hollenbach, D.J. & Tielens, A.G.G.M. 1999, Rev. Modern Phys., 71, 173 CrossRefGoogle Scholar
Hunter, D.A. & Watson, W.D. 1978, ApJ, 226, 477 CrossRefGoogle Scholar
Jenkins, E., Tripp, T., Wozniack, P., et al. 1999, ApJ, 520, 182 Google Scholar
Jura, M. 1975, ApJ, 197, 575 CrossRefGoogle Scholar
Leonas, V.B. & Pjarnpuu, A.A. 1981, Sov. Ast. Let., 7, 19 Google Scholar
Le Bourlot, J., Pineau des Forêts, G., Roueff, E., Dalgarno, A., & Gredel, R. 1995, ApJ, 449, 178 Google Scholar
Martini, P., Sellgren, K., & Hora, J.L. 1997, ApJ, 484, 296 Google Scholar
O'Brien, I. & Drury, L. 1996, MNRAS, 280, 550 Google Scholar
Rosenthal, D., Bertoldi, F., Drapatz, S., & Timmermann, R. 1999, in The Universe as seen by ISO, eds. Cox, P. & Kessler, M.F. (ESA SP-427), 561 Google Scholar
Rosenthal, D., Bertoldi, F., & Drapatz, S. 2000, A&A, submitted Google Scholar
Smith, M. 1991, MNRAS, 253, 175 Google Scholar
Schultz, A.S.B., Colgan, S.W.J., Erickson, E.F., et al. 1999, ApJ, 511, 282 Google Scholar
Sternberg, A., Yan, M., & Dalgarno, A. 1998, in Molecules in Astrophysics: Probes and Processes, ed. van Dishoeck, E.F. (Kluwer: Dordrecht), 141 Google Scholar
Timmermann, R., Bertoldi, F., Wright, C.M., Drapatz, S., Draine, B.T., Haser, L., & Sternberg, A. 1996, A&A, 315, L281 Google Scholar
Timmermann, R. 1996, ApJ, 456, 631 CrossRefGoogle Scholar
Walmsley, C.M. 1998, Astr. Lett. & Comm., 37, 1 Google Scholar
Wright, C.M., van Dishoeck, E.F., Cox, P., Sidher, S., & Kessler, M.F. 1999, ApJ, 515, L29 Google Scholar