Calibration of the AKARI far-infrared all sky-survey maps
Calibration of the AKARI far-infrared all sky-survey maps
复制标题
AKARI远红外全天巡图的校准
DOI：
10.1093/pasj/psv033
复制
发表时间：
2015
影响因子：
2.3
通讯作者：
他
中科院分区：
文献类型：
--
作者：
瀧田怜;土井靖生;大坪貴文;他
本文对AKARI卫星上的远红外探测器（FIS）在65 μ m（N60）、90 μ m（WIDE-S）、140 μ m（WIDE-L）和160 μ m（N160）波段获得的全天空图像的性质进行了初步分析。通过将数据与COBE/DIRBE数据集进行比较，确定了绝对通量校准;强度范围从几兆焦耳sr − 1到> 1千兆焦耳sr − 1。不确定度被认为是相对于DIRBE数据的标准偏差，对于N60、WIDE-S、WIDE-L和N160波段强度分别大于10、3、25和26 MJy sr − 1的情况，不确定度小于10%。图像中点源的特征也是通过以光度标准星为中心的叠加图确定的。在N60、WIDE-S和WIDE-L波段，点扩展函数（PSF）的半峰全宽分别为63 ″、78 ″和88 ″。N160波段的点扩展函数由于灵敏度的原因没有得到，但它被认为与WIDE-Lone的点扩展函数相同。
We present an initial analysis of the properties of an all-sky image obtained by the Far-Infrared Surveyor (FIS) onboard the AKARI satellite, at 65 μm (N60), 90 μm (WIDE-S), 140 μm (WIDE-L), and 160 μm (N160). An absolute flux calibration was determined by comparing the data with COBE/DIRBE data sets; the intensity range was as wide as from a few MJy sr−1to > 1 GJy sr−1. The uncertainties are considered to be the standard deviations with respect to the DIRBE data, and are less than 10% for intensities above 10, 3, 25, and 26 MJy sr−1at theN60, WIDE-S, WIDE-L, andN160bands, respectively. The characteristics of point sources in the image were also determined by stacking maps centred on photometric standard stars. The full width at half maxima of the point spread functions (PSFs) were 63″, 78″, and 88″ at theN60, WIDE-S, andWIDE-Lbands, respectively. The PSF at theN160band was not obtained due to the sensitivity, but it is thought to be the same as that of theWIDE-Lone.