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Molecule formation and infrared emission in fast interstellar shocks. III - Results for J shocks in molecular clouds
Abstract
The structure and emission spectrum of J shocks in molecular gas are studied over a broad range of conditions. It is found that at high densities chemistry has a profound effect on the emission spectrum: the density behind the shock is sufficiently high that some of the internal energy of the newly formed H2 molecules is transformed to the gas as heat by collisional deexcitations, producing the H2 formation plateau. In this temperature plateau, endothermal reactions and neutral-neutral chemical reactions with activation energies can proceed efficiently, producing significant quantities of warm H2, CO, OH, and H2O and enhanced columns of warm atoms and ions. The heat generated by the H2 formation is radiated in collisionally excited atomic fine-structure lines.
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Cited by
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Price, D. J., Wurster, J., Tricco, T. S., Nixon, C., Toupin, S., Pettitt, A., Chan, C., Mentiplay, D., Laibe, G., Glover, S., et al. (2018) · Publications of the Astronomical Society of Australia · doi:10.1017/pasa.2018.25 · Cited by 429
Walch, S., Girichidis, P., Naab, T., Gatto, A., Glover, S. C. O., Wünsch, R., Klessen, R. S., Clark, P. C., Peters, T., Derigs, D., et al. (2015) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stv1975 · Cited by 366
“H2 is assumed to form only on the surface of dust grains, following the prescription given in Hollenbach & McKee (1989), as this dominates over gas-phase formation via the H− or H+2 ions at metallicities close to solar (Glover 2003).”
BackgroundGenzel, R., Hollenbach, D., & Townes, C. H. (1994) · Reports on Progress in Physics · doi:10.1088/0034-4885/57/5/001 · Cited by 200
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Metadata
- Authors
- Hollenbach, D., & McKee, C. F.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1989-07
- Volume
- 342
- Pages
- 306
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2007156045
- Cited by
- 845
- References
- 0
- FWCI
- 5.49
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Molecule formation and infrared emission in fast interstellar shocks. III - Results for J shocks in molecular clouds. https://app.cochat.ai/papers/10.1086/167595
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- Hollenbach, D., & McKee, C. F. (1989). Molecule formation and infrared emission in fast interstellar shocks. III - Results for J shocks in molecular clouds. The Astrophysical Journal. https://doi.org/10.1086/167595
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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