The transition from diffuse atomic clouds to dense molecular clouds
Rice, Johnathan S.
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https://hdl.handle.net/2142/100820
Description
Title
The transition from diffuse atomic clouds to dense molecular clouds
Author(s)
Rice, Johnathan S.
Contributor(s)
Federman, Steven
Issue Date
2018-06-21
Keyword(s)
Astronomy
Abstract
We explore the transition from diffuse to dense molecular gas by combining a variety of tracers for density and composition. Observations and chemical modeling of CH, CH+, and CN absorption at visible wavelengths from McDonald Observatory and the European Southern Observatory are combined with ultraviolet observations of CO and H2 absorption from the Far Ultraviolet Spectroscopic Explorer and the Hubble Space Telescope, as well as emission data from the GOT C+ survey with the Herschel Space Telescope. The selected tracers from visible, ultraviolet, and radio wavelengths allow the characterization of neutral diffuse gas, including CO-dark gas. Sight lines, such as those toward h and χ Persei or those toward Chamaeleon provide a opportunity to examine the transition from atomic to molecular gas and help to describe the nature of the gas.
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