AKARI/IRC中红外全天巡天
The AKARI/IRC Mid-Infrared All-Sky Survey
摘要：
AKARI是日本第一颗专门用于红外天文学的天文卫星。AKARI的主要目的之一是在2006年5月6日至2007年8月28日期间使用9至200微米之间的六个红外波段进行全天调查。在本文中，我们提出了中红外部分（9微米和18微米波段）的调查进行了与船上的仪器之一，红外相机（IRC）。目的：本文介绍了9和18 μ m AKARI全天巡天的观测结果，并详细介绍了导致点云探测和测量的操作和数据处理。研究方法：原始数据被处理以产生用于每次扫描的小图像，并且点源候选者，高于每次扫描的5-sigma噪声水平，被导出。事件的天体坐标和通量是通过统计确定的，其检测的可靠性是通过在毫秒、小时和月内对同一源进行多次检测来保证的。结果：两个波段的天空覆盖率均大于90%。在目前公布的点源目录中，共确认了877，091个s-nm（9 um为851，189个，18 um为195，893个）。对9 μ m和18 μ m波段点源的探测限分别为50 mJy和90 mJy。位置精度估计优于2”。飞行中绝对通量校准的不确定性估计为9 μ m波段为3%，18 μ m波段为4%。与IRAS观测结果进行了比较，发现两者在统计上是一致的。
英文摘要：
Context : AKARI is the first Japanese astronomical satellite dedicated to infrar ed astronomy. One of the main purposes of AKARI is the all-sky survey performed with six infrared bands between 9 and 200um during the period from 2006 May 6 to 2007 August 28. In this paper, we present the mid-infrared part (9um and 18um b ands) of the survey carried out with one of the on-board instruments, the Infrar ed Camera (IRC). Aims : We present unprecedented observational results of the 9 and 18um AKARI al l-sky survey and detail the operation and data processing leading to the point s ource detection and measurements. Methods : The raw data are processed to produce small images for every scan and point sources candidates, above the 5-sigma noise level per single scan, are der ived. The celestial coordinates and fluxes of the events are determined statisti cally and the reliability of their detections is secured through multiple detect ions of the same source within milli-seconds, hours, and months from each other. Results : The sky coverage is more than 90% for both bands. A total of 877,091 s ources (851,189 for 9um, 195,893 for 18um) are confirmed and included in the cur rent release of the point source catalogue. The detection limit for point source s is 50mJy and 90mJy for the 9um and 18um bands, respectively. The position accu racy is estimated to be better than 2". Uncertainties in the in-flight absolute flux calibration are estimated to be 3% for the 9um band and 4% for the 18um ban d. The coordinates and fluxes of detected sources in this survey are also compar ed with those of the IRAS survey and found to be statistically consistent.
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