Book contents
- Frontmatter
- Dedication
- Contents
- Preface
- List of Acronyms
- Part I Introduction
- Part II Low-Mass Star Formation (LMSF)
- Part III High-Mass Star Formation (HMSF)
- Part IV Ionisation
- Part V Photodissociation
- 13 ATLASGAL PDRs
- 14 The Orion Bar in M42
- 15 The Horsehead Nebula in Orion
- Part VI External Galaxies
- Appendices
- List of Research Journal Abbreviations
- References
- Chemical Index
- Subject Index
14 - The Orion Bar in M42
from Part V - Photodissociation
Published online by Cambridge University Press: 11 April 2023
- Frontmatter
- Dedication
- Contents
- Preface
- List of Acronyms
- Part I Introduction
- Part II Low-Mass Star Formation (LMSF)
- Part III High-Mass Star Formation (HMSF)
- Part IV Ionisation
- Part V Photodissociation
- 13 ATLASGAL PDRs
- 14 The Orion Bar in M42
- 15 The Horsehead Nebula in Orion
- Part VI External Galaxies
- Appendices
- List of Research Journal Abbreviations
- References
- Chemical Index
- Subject Index
Summary
The Orion Bar as the canonical high-flux PDR is examined. In addition to a detailed description of the source, the estimation of physical parameters such as ionization fraction and observational indicators such as carbon recombination lines are considered. High-resolution observations point to the sensitivity of carbon chemistry to CR ionization and the apparent merging of C/C+/CO transition and H/H2 transition zones not readily predicted by theory. A wide range of molecular sulphur observations also presents the opportunity to rethink gas–grain reaction networks and model their consequences, with a following chapter looking at the low-flux PDR case of the Horsehead Nebula, through which the sulphur question will be further explored.
- Type
- Chapter
- Information
- Case Studies in Star FormationA Molecular Astronomy Perspective, pp. 216 - 235Publisher: Cambridge University PressPrint publication year: 2023