Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16q..53s&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 2, p. (2)53-(2)60
Astronomy and Astrophysics
Astronomy
2
Ice Environments, Interstellar Chemistry, Interstellar Matter, Organic Solids, Astronomical Models, Comets, Formaldehyde, Infrared Space Observatory (Iso), Nitrogen, Oxygen, Ultraviolet Astronomy
Scientific paper
An absorption feature at 3.4 micrometers has been observed in various lines-of-sight through the diffuse interstellar medium. Its position and width lead to an identification with the C-H stretching mode of solid organic material. A possible mechanism for the production of organic solids in the interstellar medium is UV photoprocesisng of icy mantles which accrete on dust grains in dense clouds. Furthermore, thermally induced reactions involving formaldehyde molecules in the mantles could be an important source of organics. Laboratory simulation of these processes shows that a large variety of oxygen- and nitrogen-rich species may be produced. It is shown that the occurrence of periodic transient heating events plays an important role in the production of organic material in the ice mantles. Finally, it is pointed out how future missions like the Infrared Space Observatory (ISO) as well as analysis of comet material by Rosetta may be able to clarify the nature and evolution of interstellar organics.
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