Abstract
We present new near-infrared, far-infrared, submillimeter, and millimeter wave spectroscopic data from the “Pistol” and “Sickle” region. Our data show that the interior of the Sickle molecular cloud is only weakly excited by Galactic center standards. The exterior of the cloud is highly excited, and we make a strong argument for excitation of a diffuse envelope by ultraviolet light from hot stars that have recently formed in the Galactic center. Other mechanisms (relativistic particles, ohmic heating, and shocks) may be present but are energetically unimportant in at least the Sickle region, and by extension probably throughout the Radio Arches as well.
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Harris, A.I. et al. (1994). Spectroscopy of the Galactic Center Arches Region: Evidence for Massive Star Formation. In: Genzel, R., Harris, A.I. (eds) The Nuclei of Normal Galaxies. NATO ASI Series, vol 445. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0752-5_30
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DOI: https://doi.org/10.1007/978-94-011-0752-5_30
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