{"title":"ISM中的冷尘","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":"{\"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}","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}
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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