恒星形成星系中的UV尘埃衰减：II校准A（UV）与L_TIR/L_UV关系
UV Dust Attenuation in Star-forming Galaxies: II Calibrating the A(UV) vs. L_TIR/L_UV relation
摘要：
我们调查的依赖性的总红外（TIR），紫外光光度比方法计算紫外尘埃衰减A（UV）的年龄的基础恒星星族使用的光谱能量分布的图书馆与不同的恒星形成历史的星系。我们的分析证实，TIR/UV与A（UV）的关系显着不同的年龄的潜在的恒星星族：即对于相同的TIR/UV比，低比恒星形成率（SSFR）的系统遭受较低的紫外线衰减比星爆。使用附近的场和星系团螺旋星系的样本，我们表明，使用一个标准的（即年龄无关）TIR/UV与A（UV）的关系导致系统高估高达2个数量级的紫外线尘埃衰减所遭受的对象与低SSFR，特别是HI缺乏恒星形成星系团。这一结果指出，年龄无关的$TIR/UV$与$A(UV)$关系不能用于研究大样本星系的紫外性质，包括低恒星形成系统和被动螺旋。因此，我们给出了一些简单的经验关系，紫外线衰减可以估计考虑到它的依赖于年龄的恒星星族，提供了一个更少的偏见的看法星系的紫外线特性。
英文摘要：
We investigate the dependence of the total-infrared (TIR) to UV luminosity ratio method for calculating the UV dust attenuation A(UV) from the age of the underlying stellar populations by using a library of spectral energy distributions for galaxies with different star formation histories. Our analysis confirms that the TIR/UV vs. A(UV) relation varies significantly with the age of the underlying stellar population: i.e. for the same TIR/UV ratio, systems with low specific star formation rate (SSFR) suffer a lower UV attenuation than starbursts. Using a sample of nearby field and cluster spiral galaxies we show that the use of a standard (i.e. age independent) TIR/UV vs. A(UV) relation leads to a systematic overestimate up to 2 magnitudes of the amount of UV dust attenuation suffered by objects with low SSFR and in particular HI-deficient star forming cluster galaxies. This result points out that the age independent $TIR/UV$ vs. $A(UV)$ relation cannot be used to study the UV properties of large samples of galaxies including low star-forming systems and passive spirals. Therefore we give some simple empirical relations from which the UV attenuation can be estimated taking into account its dependence on the age of the stellar populations, providing a less biased view of UV properties of galaxies.
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