AKARI far-infrared all sky survey

Doi, Y.; Etxaluze, M.; White, G.; Figuered, E.; Chinone, Y.; Hattori, M.; Ikeda, N.; Kitamura, Y.; Komugi, S.; Nakagawa, T.; Yamauchi, C.; Matsuoka, Y.; Kaneda, H.; Kawada, M. and Shibai, H. (2009). AKARI far-infrared all sky survey. In: SPICA joint European/Japanese Workshop (Heras, A. M.; Swinyard, B. M.; Isaak, K. G. and Goicoechea, J. R. eds.), 04018.

DOI: https://doi.org/10.1051/spica/200904018

URL: http://spica.edpsciences.org/index.php?option=com_...


We demonstrate the capability of AKARI for mapping diffuse far-infrared emission and achieved reliability of allsky diffuse map. We have conducted an all-sky survey for more than 94% of the whole sky during the cold phase of AKARI observations in 2006 Feb. - 2007 Aug. The survey in the far-infrared waveband covers 50 ?m - 180 ?m with four bands centered at 65 ?m, 90 ?m, 140 ?m, and 160 ?m and spatial resolution of 30" - 40" (FWHM).This survey has allowed us to make a revolutionary improvement compared to the IRAS survey that was conducted in 1983 in both spatial resolution and sensitivity after more than a quarter of a century. Additionally, it will provide us the first all-sky survey data with high-spatial resolution beyond 100 ?m. Considering the extreme importance of the AKARI far-infrared diffuse emission map, we are now investigating carefully the quality of the data for possible release of the archival data. Critical subjects in making an image of diffuse emission from the detected signal are the transient response and the long-term stability of the farinfrared detectors. Quantitative evaluation of these characteristics is the key to achieve sensitivity comparable to or better than that for point sources (< 20 - 95 [MJy/sr]). We describe current activities and progress that are focused on making high quality all-sky survey images of the diffuse far-infrared emission.

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