Observations of atomic gas in photodissociation regions

White, Glenn J. and Padman, Rachael (1992). Observations of atomic gas in photodissociation regions. In: Astrochemistry of Cosmic Phenomena: Proceedings of the 150th Symposium of the International Astronomical Union, 5-9 Aug 1991, Campos do Jordao, Sao Paulo, Brazil, p. 297.

DOI: https://doi.org/10.1007/978-94-011-2761-5_65

URL: http://adsabs.harvard.edu/abs/1992IAUS..150..297W


At the interface between an HII region and a molecular cloud, lies a neutral gas layer which is subject to both an intense radiation field, and to shocks arising from the expansion of the ionisation front of the HII region. The gas in these regions is highly excited, hot, and may be fairly dense. We present the first high resolution images of atomic carbon towards a sample of ionisation front sources. This study has relevance to our understanding of shock induced star formation, the formation and destruction of molecular species under extreme conditions, shock processes in the ISM, and the energy balance in molecular clouds.

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