证明单T修正黑体适合Herschel SED（研究笔记）
Vindicating single-T modified blackbody fits to Herschel SEDs (Research Note)
摘要：
我在这里表明，在一个星系中的尘埃质量的大部分可以等效地估计从：i）尘埃发射的全光谱能量分布，使用Draine & Lee（2007）的方法，包括尘埃颗粒的分布和星际辐射场强度的范围; ii）波长范围100 μ m <= λ <= 500 μ m（由Herschel空间天文台覆盖）内的发射，通过将数据拟合到更简单的单温度修正黑体。相反，最近的声明（Dale等人，2012年）应被解释为在更简单的拟合中使用吸收截面的警告，该吸收截面在归一化和光谱指数β方面都与全尘埃模型一致。我还表明，尘埃质量并不依赖于β的选择显着，如果尘埃质量和吸收截面与β相同的假设。
英文摘要：
I show here that the bulk of the dust mass in a galaxy can be equivalently estimated from: i) the full spectral energy distribution of dust emission, using the approach of Draine & Lee (2007) that includes a distribution of dust grains and a range of interstellar radiation field intensities; ii) the emission in the wavelength range 100um <= lambda <= 500um (covered by the Herschel Space Observatory), by fitting to the data a simpler single temperature modified blackbody. Recent claims on the contrary (Dale et al. 2012) should be interpreted as a caveat to use in the simpler fits an absorption cross section which is consistent both in the normalization and in the spectral index beta with that of the full dust model. I also show that the dust mass does not depend significantly on the choice of beta, if both the dust mass and the absorption cross section are derived with the same assumption on beta.
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