摘要
根据IRAS四个波段的红外辐射流量,并认为尘埃粒子的红外吸收系数对波长的依赖关系为下列形式Q_(abs)∝λ^(-n),导出了IRAS/Cirrus 7中的观测尘埃温度T_d,辐射峰值波长λ_m及尘埃的远红外光学厚度τ_(60μ),τ_(100μ)。与由浸没在银河系总辐射场中的尘埃粒子模型所予言的平衡温度比较,讨论了IRAS/Cirrus 7中尘埃粒子的尺度,成分等性质以及对尘埃粒子加热的能量来源。
By using IRAS 60μ and 100μ average fluxes, the observational dust temperature Td,obs in IRAS/Cirrus cloud 7 is derive under the assumption that the absorption coefficient of dust has the form Qabs∝λ-n for long wavelength. Then, the wavelength λm for maximal radiation is estimated by using the modified Planck function. The optical depths of dust at 60μ and 100μ are also calculated. By comparing Td,obs with the equilibrium temperature Td,eq of modelling dust immerged in the interstellar radiation field, the size, composition of dust grain and the energy source for the dust in IRAS /Cirrus cloud 7 are discussed.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1992年第1期107-110,共4页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学资金
