The 6 $\mu$m Feature as A Tracer of Aliphatic Components of Interstellar Carbonaceous Grains

Abstract

An unidentified infrared emission (UIE) feature at 6.0 $\mu$m is detected in a number of astronomical sources showing the UIE bands. In contrast to the previous suggestion that this band is due to C=O vibrational modes, we suggest that the 6.0 $\mu$m feature arises from olefinic double-bond functional groups. These groups are likely to be attached to aromatic rings which are responsible for the major UIE bands. The possibility that the formation of these functional groups is related to the hydrogenation process is discussed.

43 pages, 15 figures, accepted for publication in the Astrophysical Journal

References in corpus (9)

• The evolution of amorphous hydrocarbons in the ISM: dust modelling from a new vantage point
• The unusual hydrocarbon emission from the early carbon star HD 100764: The connection between aromatics and aliphatics
• The mixed chemistry phenomenon in Galactic Bulge PNe
• The characteristics of the IR emission features in the spectra of Herbig Ae stars: Evidence for chemical evolution
• On the viability of the PAH model as an explanation of the unidentified infrared emission features
• [SiPAH]+ pi-Complexes in the Interstellar Medium
• A Theoretical Study on the Vibrational Spectra of PAH Molecules with Aliphatic Sidegroups
• On the origin of the 11.3 micron unidentified infrared emission feature
• Complex Organic and Inorganic Compounds in Shells of Lithium-rich K Giant Stars

Cited by in corpus (1)

• A young multipolar planetary nebula in the making: IRAS 21282+5050