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dc.contributor.authorGao, Jianeng
dc.contributor.authorJiang, B. W.eng
dc.contributor.authorLi, Aigeneng
dc.date.issued2008eng
dc.description.abstractObservationally, both the 3.4 μm aliphatic hydrocarbon C-H stretching absorption feature and the 9.7 μm amorphous silicate Si-O stretching absorption feature show considerable variations from the local diffuse interstellar medium (ISM) to Galactic center (GC): both the ratio of the visual extinction (AV ) to the 9.7 μm Si-O optical depth ( 9.7 μm) and the ratio of AV to the 3.4 μm C-H optical depth ( 3.4 μm) of the solar neighborhood local diffuse ISM are about twice as much as that of the GC. In this work, we try to explain these variations in terms of a porous dust model consisting of a mixture of amorphous silicate, carbonaceous organic refractory dust (as well as water ice for the GC dust).eng
dc.description.sponsorshipThis work is supported in part by NSFC grant No. 10603001, SRFDP grant No. 20060027013 and NCET-05-0144. AL is supported in part by NASA/HST Cycle-15 Theory Program and NSF grant AST 07-07866.eng
dc.identifier.citationarXiv:0812.2016v2eng
dc.identifier.urihttp://hdl.handle.net/10355/5160eng
dc.languageEnglisheng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publicationseng
dc.source.urihttp://arxiv.org/PS_cache/arxiv/pdf/0812/0812.2016v2.pdfeng
dc.subjectInterstellar extinctioneng
dc.subjectdusteng
dc.subjectsilicateeng
dc.subjectaliphatic hydrocarboneng
dc.subject.lcshInterstellar reddeningeng
dc.subject.lcshInfrared astronomy -- Observationseng
dc.subject.lcshAliphatic compoundseng
dc.subject.lcshSilica geleng
dc.titleToward understanding the 3.4 micron and 9.7 micron extinction feature variations from the local diffuse interstellar medium to the Galactic centereng
dc.typeArticleeng


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