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 Title: THE TRANSITION FROM DIFFUSE ATOMIC CLOUDS TO DENSE MOLECULAR CLOUDS Author(s): Rice, Johnathan S. Contributor(s): Federman, Steven Subject(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 H$_{2}$ 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 $\chi$ 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. Issue Date: 06/21/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100820 DOI: 10.15278/isms.2018.RL08 Other Identifier(s): RL08 Date Available in IDEALS: 2018-08-172018-12-12
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