冷尘埃流的斯皮策观测
Spitzer Observations of Cold Dust Galaxies
摘要：
我们结合新的斯皮策太空望远镜的观测中，远红外与SCUBA 850微米的观测，以改善测量的尘埃温度，质量和光度的11个星系的SCUBA本地宇宙星系调查（SLUGS）。通过拟合尘埃模型，我们测量了典型的尘埃质量为10E7.9 M_sol和尘埃光度为~ 10 E10 L_sol，对于中等恒星形成率的星系。本文提供的数据结合以前的观测表明，冷尘埃存在于所有类型的旋涡星系中，是它们总光度的主要贡献者。由于本文测量的SCUBA源的尘埃温度较低，它们的远红外nu F_nu（160 μ m）/nu F_nu（850 μ m）斜率比更大的斯皮策邻近星系巡天（SINGS）更平坦，SINGS是提供附近宇宙星系尘埃性质最好测量的样本。这里提供的新数据添加到SINGS扩展了被本地星系很好地覆盖的参数空间，提供了一套全面的模板，可用于解释附近和遥远星系的观测。
英文摘要：
We combine new Spitzer Space Telescope observations in the mid- and far-infrared with SCUBA 850 micron observations to improve the measurement of dust temperatures, masses and luminosities for 11 galaxies of the SCUBA Local Universe Galaxy Survey (SLUGS). By fitting dust models we measure typical dust masses of 10E7.9 M_sol and dust luminosities of ~ 10E10 L_sol, for galaxies with modest star formation rates. The data presented in this paper combined with previous observations show that cold dust is present in all types of spiral galaxies and is a major contributor to their total luminosity. Because of the lower dust temperature of the SCUBA sources measured in this paper, they have flatter Far-IR nu F_nu(160um)/nu F_nu(850um) slopes than the larger Spitzer Nearby Galaxies Survey (SINGS), the sample that provides the best measurements of the dust properties of galaxies in the nearby universe. The new data presented here added to SINGS extend the parameter space that is well covered by local galaxies, providing a comprehensive set of templates that can be used to interpret the observations of nearby and distant galaxies.
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