{"title":"Cold dust in the ISM","authors":"E. Wright","doi":"10.1063/1.44012","DOIUrl":null,"url":null,"abstract":"The spectrum of the Milky Way observed by the COBE FIRAS instrument shows an excess of long wavelength emission when compared to a single temperature σ∝ν2 dust model. This excess could be due to a massive population of large spherical grains or to a very small mass of fractal grains. Fractal dust grains with low equilibrium temperatures can produce the bulk of the IR emission by single photon thermal pulsing with peak temperatures of ≊20 K.","PeriodicalId":310353,"journal":{"name":"Back to the Galaxy","volume":"39 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2008-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Back to the Galaxy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1063/1.44012","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
The spectrum of the Milky Way observed by the COBE FIRAS instrument shows an excess of long wavelength emission when compared to a single temperature σ∝ν2 dust model. This excess could be due to a massive population of large spherical grains or to a very small mass of fractal grains. Fractal dust grains with low equilibrium temperatures can produce the bulk of the IR emission by single photon thermal pulsing with peak temperatures of ≊20 K.
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