The Abundance of C_7^- in Diffuse Clouds

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fac_HerbstE_TheAstrophysicalJournal_1999_523_678.pdf (139.52 KB)

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1999-10-01

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American Astronomical Society

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Abstract

It has recently been proposed that C_7^- is a carrier of five of the numerous diffuse interstellar bands. In this paper, we report an attempt to reproduce the required abundance of C_7^- relative to hydrogen of n(C_7^-) ~ 1 × 10^-9n_H through the use of various models for the chemistry in diffuse clouds. Our model network contains large neutral and charged linear hydrocarbons and incorporates the time-dependent desorption of seed molecules from grain surfaces. We find a limited set of physical and chemical conditions that result in the required fractional abundance of C_7^- but only for rather short periods of time.

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ISM: abundances, ISM: clouds, ISM: molecules, line: identification, molecular processes

Citation

Deborah P. Ruffle et al, "The Abundance of C_7^- in Diffuse Clouds," The Astrophysical Journal 523, no. 2 (1999), doi:10.1086/307775

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http://hdl.handle.net/1811/47844

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Ohio State University Research and Scholarship