期刊
ASTROPHYSICAL JOURNAL
卷 684, 期 2, 页码 1228-1239出版社
UNIV CHICAGO PRESS
DOI: 10.1086/590375
关键词
dust, extinction; ISM : clouds; surveys
资金
- National Science Foundation [AST 05-40399, AST-0407172]
Using far-infrared emission maps taken by IRAS and Spitzer and a near-infrared extinction map derived from 2MASS data, we have made dust temperature and column density maps of the Perseus molecular cloud. We show that the emission from transiently heated very small grains (VSGs) and the big grain dust emissivity vary as a function of extinction and dust temperature, with higher dust emissivities for colder grains. This variable emissivity cannot be explained by temperature gradients along the line of sight or by noise in the emission maps, but it is consistent with grain growth in the higher density and lower temperature regions. By accounting for the variations in the dust emissivity and VSG emission, we are able to map the temperature and column density of a nearbymolecular cloud with better accuracy than has previously been possible.
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