用AKARI/远红外探测器（FIS）观测的蓝致密矮星系的远红外特性
Far-Infrared Properties of Blue Compact Dwarf Galaxies Observed with AKARI/Far-Infrared Surveyor (FIS)
摘要：
本文报道了AKARI观测到的八个蓝色致密矮星系（BCD）的基本远红外（FIR）特性。我们在四个FIS波段（波长为65 μ m，90 μ m，140 μ m和160 μ m）测量通量。基于这些通量，我们估计尘埃的基本数量：尘埃温度，尘埃质量，和总FIR光度。我们发现，典型的尘埃温度的BCD样本系统高于正常的螺旋星系，虽然有很大的变化。由尘埃温度估算的星际辐射场范围可达银河值的100倍。这证实了BCD中的恒星形成活动集中。由远红外线光度值可以估算出恒星形成率为0.01- 0.5 $M_\odot$ yr $^{-1}$。结合这一数量与气体质量从文献中，我们估计气体消耗的时间尺度（气体质量除以恒星形成率），这证明跨越了很宽的范围从1 Gyr到100 Gyr。间歇性的恒星形成活动可以提供对这种大变化的自然解释。最后，我们展示了尘气比和金属丰度之间的关系（我们利用我们对尘埃质量的估计，并从文献中获取其他必要的量）。正如化学演化模型所预期的那样，尘气比与金属丰度之间存在正相关关系。
英文摘要：
We report basic far-infrared (FIR) properties of eight blue compact dwarf galaxies (BCDs) observed by AKARI. We measure the fluxes at the four FIS bands (wavelengths of 65 um, 90 um, 140 um, and 160 um). Based on these fluxes, we estimate basic quantities about dust: dust temperature, dust mass, and total FIR luminosity. We find that the typical dust temperature of the BCD sample is systematically higher than that of normal spiral galaxies, although there is a large variety. The interstellar radiation field estimated from the dust temperature ranges up to 100 times of the Galactic value. This confirms the concentrated star-forming activity in BCDs. The star formation rate can be evaluated from the FIR luminosity as 0.01--0.5 $M_\odot$ yr$^{-1}$. Combining this quantity with gas mass taken from the literature, we estimate the gas consumption timescales (gas mass divided by the star formation rate), which prove to span a wide range from 1 Gyr to 100 Gyr. A natural interpretation of this large variety can be provided by intermittent star formation activity. We finally show the relation between dust-to-gas ratio and metallicity (we utilize our estimate of dust mass, and take other necessary quantities from the literature). There is a positive correlation between dust-to-gas ratio and metallicity as expected from chemical evolution models.
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