在斯皮策红外近星系巡天中对远红外卷云发射的偶然观测：远红外相关的分析
Serendipity observations of far infrared cirrus emission in the Spitzer Infrared Nearby Galaxies Survey: Analysis of far-infrared correlations
摘要：
我们提出了一个分析的远红外尘埃排放弥漫卷云。这项研究是基于斯皮策红外近地天体巡天（SINGS）在高银河纬度160微米处用斯皮策太空望远镜上的多波段成像光度计（MIPS）进行的偶然观测。这些观测与IRIS 100和60微米的数据相辅相成，构成了小尺度弥漫星际云远红外观测的最灵敏和最无偏见的样本之一。在宇宙红外背景波动占主导地位的区域之外，我们观察到卷云发射的160/100颜色的大量散射。我们将160/100颜色变化与相同字段中的60/100颜色进行比较，发现随着160/100的增加，60/100减少的趋势。目前的尘埃模型不能仅仅通过改变星际辐射场来解释这种趋势。它要求尘埃特性发生重大变化，如粒度分布或发射率，或沿视线在不同物理条件下混合云。这些变化对于河外星系研究来说是一个重要的潜在的令人困惑的前景。
英文摘要：
We present an analysis of far-infrared dust emission from diffuse cirrus clouds. This study is based on serendipitous observations at 160 microns at high galactic latitude with the Multiband Imaging Photometer (MIPS) onboard the Spitzer Space Telescope by the Spitzer Infrared Nearby Galaxies Survey (SINGS). These observations are complemented with IRIS data at 100 and 60 microns and constitute one of the most sensitive and unbiased samples of far infrared observations at small scale of diffuse interstellar clouds. Outside regions dominated by the cosmic infrared background fluctuations, we observe a substantial scatter in the 160/100 colors from cirrus emission. We compared the 160/100 color variations to 60/100 colors in the same fields and find a trend of decreasing 60/100 with increasing 160/100. This trend can not be accounted for by current dust models by changing solely the interstellar radiation field. It requires a significant change of dust properties such as grain size distribution or emissivity or a mixing of clouds in different physical conditions along the line of sight. These variations are important as a potential confusing foreground for extragalactic studies.
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