The AKARI/IRC Mid-Infrared All-Sky Survey
Abstract
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.
Keywords
Cite
@article{arxiv.1003.0270,
title = {The AKARI/IRC Mid-Infrared All-Sky Survey},
author = {Daisuke Ishihara and Takashi Onaka and Hirokazu Kataza and Alberto Salama and Carlos Alfageme and Angelo Cassatella and Nick Cox and Pedro Garcia-Lario and Craig Stephenson and Martin Cohen and Naofumi Fujishiro and Hideaki Fujiwara and Sunao Hasegawa and Yoshifusa Ita and Woojung Kim and Hideo Matsuhara and Hiroshi Murakami and Thomas G. Muller and Takao Nakagawa and Youichi Ohyama and Shinki Oyabu and Jeonghyun Pyo and Itsuki Sakon and Hiroshi Shibai and Satoshi Takita and Toshihiko Tanabe and Kazunori Uemizu and Munetaka Ueno and Fumihiko Usui and Takehiko Wada and Hiden ori Watarai and Issei Yamamura and Chisato Yamauchi},
journal= {arXiv preprint arXiv:1003.0270},
year = {2015}
}
Comments
Accepted for publication in AandA AKARI special issue