The formation of long carbon chains in diffuse clouds

Details The formation of long carbon chains in diffuse clouds The formation of long carbon chains in diffuse clouds

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.286..344t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 2, pp. 344-348.

Astronomy and Astrophysics

Astronomy

6

Mhd, Molecular Processes, Ism: Abundances, Ism: Molecules

Scientific paper

Unsaturated hydrocarbon chains have been suggested as carriers of the diffuse interstellar bands (DIBs). To be resistant to the ultraviolet radiation field these chains must contain a considerable number of carbon atoms and previous models of chain formation in situ have required a high abundance of a `seed' molecule of conjectured origin, already containing a high number of carbon atoms. In this paper we show how it may be possible to form large chain molecules without a seed by the driving of endothermic reactions in the edges of diffuse clouds. The driving mechanism may be the effect of the dissipation of magnetohydrodynamic waves in a `cold' cloud edge, which would require a `burst' of high-amplitude oscillations occurring for a fraction of the cloud lifetime, or alternatively it may be the heating caused by a turbulent interface.

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