The AKARI/IRC mid-infrared all-sky survey
The AKARI/IRC mid-infrared all-sky survey
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DOI：
10.1051/0004-6361/200913811
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发表时间：
2010-03
影响因子：
6.5
通讯作者：
D. Ishihara;T. Onaka;H. Kataza;A. Salama;C. Alfageme;A. Cassatella;N. Cox;P. Garcı́a-Lario;
中科院分区：
文献类型：
--
作者：
D. Ishihara;T. Onaka;H. Kataza;A. Salama;C. Alfageme;A. Cassatella;N. Cox;P. Garcı́a-Lario;
上下文。AKARI是日本第一颗致力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日期间对9 μ m至200 μ m的6个红外波段进行全天巡天。本文介绍了用机载仪器红外相机（IRC）测量的中红外部分（9 μ m和18 μ m波段）。目标。本文介绍了前所未有的9 μ m和18 μ m AKARI全天巡天观测结果，并详细介绍了点源探测和测量的操作和数据处理。方法。对原始数据进行处理，使每次扫描产生小图像，并在每次扫描的5 σ噪声级以上得到候选点源。这些事件的天体坐标和通量是用统计方法确定的，通过在毫秒、小时和月之间对同一源进行多次探测，确保了探测的可靠性。结果。两个波段的天空覆盖率都在90%以上。共有877 091个源（851 189个为9 μ m， 195 893个为18 μ m）被确认并包含在当前版本的点源目录中。在9 μ m和18 μ m波段，点源的检出限分别为50 mJy和90 mJy。定位精度估计优于2”。飞行绝对通量校准的不确定度在9 μ m波段估计为3%，在18 μ m波段估计为4%。本次调查中探测到的源的坐标和通量也与IRAS调查的坐标和通量进行了比较，发现在统计上是一致的。
Context. AKARI is the first Japanese astronomical satellite dedicated to infrared astronomy. One of the main purposes of AKARI is the all-sky survey performed with six infrared bands between 9 μ m and 200 μ m during the period from 2006 May 6 to 2007 August 28. In this paper, we present the mid-infrared part (9 μ m and 18 μ m bands) of the survey carried out with one of the on-board instruments, the infrared camera (IRC). Aims. We present unprecedented observational results of the 9 μ m and 18 μ m AKARI all-sky survey and detail the operation and data processing leading to the point source detection and measurements. Methods. The raw data are processed to produce small images for every scan, and the point sources candidates are derived above the 5 σ noise level per single scan. The celestial coordinates and fluxes of the events are determined statistically and the reliability of their detections is secured through multiple detections 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 sources (851 189 for 9 μ m, 195 893 for 18 μ m) are confirmed and included in the current release of the point source catalog. The detection limit for point sources is 50 mJy and 90 mJy for the 9 μ m and 18 μ m bands, respectively. The position accuracy is estimated to be better than 2 '' . Uncertainties in the in-flight absolute flux calibration are estimated to be 3% for the 9 μ m band and 4% for the 18 μ m band. The coordinates and fluxes of detected sources in this survey are also compared with those of the IRAS survey and are found to be statistically consistent.