Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-13
Mon.Not.Roy.Astron.Soc.357:961-966,2005
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.08693.x
Transient microstructure in the diffuse interstellar medium has been observed towards galactic and extragalactic sources for decades, usually in lines of atoms and ions, and, more recently, in molecular lines. Evidently, there is a molecular component to the transient microstructure. In this paper we explore the chemistry that may arise in such microstructure. We use a PDR code to model the conditions of relatively high density, low temperature, very low visual extinction and very short elapsed time that are appropriate for these objects. We find that there is a well defined region of parameter space where detectable abundances of molecular species might be found. The best matching models are those where the interstellar microstructure is young (<100 yr), small (~100 AU), and dense (>10^4 cm^-3).
Bell Thomas A.
Crawford Ian A.
Price Richard J.
Viti Serena
Williams David. A.
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