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1 results

  • 14 - The Orion Bar in M42

  • from Part V - Photodissociation
  • Duncan MacKay, University of Kent, Canterbury, Mark Thompson, University of Leeds, James Urquhart, University of Kent, Canterbury
  • Book:
    Case Studies in Star Formation
    Published online:
    11 April 2023
    Print publication:
    13 April 2023, pp 216-235

  • 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.