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- W80451905 abstract "The distribution, chemical structure, and formation of organic matter in the interstellar medium are important to our understanding of the overall evolution of dust. The exchange of dust between the dense and diffuse interstellar media, and the effects of processing on dust within dense clouds will affect the inventory of material available for incorporation into newly forming star and planetary systems. A series of absorption bands near 3.4 μm has been observed towards bright infrared objects which are seen through large column densities of interstellar dust. These aliphatic hydrocarbons carry the -CH2and -CH3 functional groups in the abundance ratio CH2/CH3 ∼ 2.5, and the amount of carbon tied up in this component is greater than 4% of the available cosmic carbon. The 3.4 μm band has been detected in absorption along more than two dozen lines-of-sight throughout the diffuse interstellar medium of our own Galaxy, as well as in the dusty spectra of other galaxies. Aliphatic hydrocarbons are also seen in the acid insoluble residue and organic extracts from carbonaceous meteorites, and the strong similarity between these features and those found in the diffuse interstellar dust, amid other signatures of a stellar history, suggests that interstellar organic material survives the formation of planetary systems. Comparisons of laboratory residues to the interstellar dust features provide clues to the origin of the aliphatic component. The evidence supports an origin in the outflow of carbon stars, as well as a formation site in the diffuse ISM itself, rather than an origin within dense molecular cloud ices. Perhaps the most significant advance in the field comes from nearby ultraluminous galaxies which sometimes show greater potential for band profile studies than sources within our Galaxy. The redshift to wavelengths further removed from atmospheric interference makes ground-based observations of the entire L band of these galaxies feasible for z<0.3." @default.
- W80451905 created "2016-06-24" @default.
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- W80451905 date "2004-05-01" @default.
- W80451905 modified "2023-09-23" @default.
- W80451905 title "Hydrocarbons in Meteorites, the Milky Way, and Other Galaxies" @default.
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- W80451905 hasPublicationYear "2004" @default.
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