The Gas-to-Dust Relation in the Dark Cloud L1523-Observational Evidence for CO Gas Depletion

查看全文 作　　者：[1]H.G.Kim;[1]B.G.Kim;[1]J.H.Jung

机构地区：[1]Korea Astronomy and Space Science Institute,61-1, Hwaam, Yuseong, Daejeon 305-348, Korea

出　　处：《Chinese Journal of Astronomy and Astrophysics》索引2008年第8卷第6期,共7页

摘　　要：Correlation between gas and dust column density has been studied for the dark globule L1523.The 13CO(J=1→0) emission is used for tracing the gas,and the IR emissions,for tracing the dust constituent.In order to match the beam resolution between the images,a beam de-convolution algorithm based on the Maximum Correlation Method(MCM) was applied on the Infrared Astronomical Satellite(IRAS) data.The morphology of 13CO column density map shows a close correlation to that of 100 μm dust optical depth.The distribution of the optical depth at 100μm follows that of gas column density more closely than does the flux map at either 60 or 100 μm.The ratio of the 13CO column density to the 100μm optical depth shows a decreasing trend with increasing dust optical depth in the central part,indicating possible molecular gas condensation onto dust particles.The excessive decrease in the CO column density in the envelope may most probably be due to the photo-dissociation of CO molecules. 关键词：ISM 星云浮尘分子构成

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The Gas-to-Dust Relation in the Dark Cloud L1523-Observational Evidence for CO Gas Depletion

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