Far-infrared observations provide crucial data for the investigation and characterisation of the properties of dusty material in the Interstellar Medium (ISM), since most of its energy is emitted between ~ 100 and 200 μm . We present the first all-sky image from a sensitive all-sky survey using the Japanese AKARI satellite, in the wavelength range 50 − 180 μm . Covering > 99% of the sky in four photometric bands with four filters centred at 65 μm , 90 μm , 140 μm , and 160 μ m wavelengths, this achieved spatial resolutions from 1 to 2 arcmin and a detection limit of < 10 MJy s r − 1 , with absolute and relative photometric accuracies of < 20%. All-sky images of the Galactic dust continuum emission enable astronomers to map the large-scale distribution of the diffuse ISM cirrus, to study its thermal dust temperature, emissivity and column density, and to measure the interaction of the Galactic radiation field and embedded objects with the surrounding ISM. In addition to the point source population of stars, protostars, star-forming regions, and galaxies, the high Galactic latitude sky is shown to be covered with a diffuse filamentary-web of dusty emission that traces the potential sites of high latitude star formation. We show that the temperature of dust particles in thermal equilibrium with the ambient interstellar radiation field can be estimated by using 90 μm , 140 μm , and 160 μm data. The FIR AKARI full-sky maps provide a rich new data set within which astronomers can investigate the distribution of interstellar matter throughout our Galaxy, and beyond.

ABSTRACT
1. INTRODUCTION
2. OBSERVATION AND DATA REDUCTION
3. RESULTS
4. DISCUSSION
    4.1. Spatial Power Spectra
    4.2. Spectral Energy Distribution
5. CONCLUSION
REFERENCES

• YASUO DOI(Department of Earth Science and Astronomy, the University of Tokyo)
• SHINYA KOMUGI(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• MITSUNOBU KAWADA(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• SATOSHI TAKITA(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• KO ARIMATSU(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• NORIO IKEDA(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• DAISUKE KATO(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• YOSHIMI KITAMURA(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• TAKAO NAKAGAWA(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• TAKAFUMI OOTSUBO(Astronomical Institute, Tohoku University)
• TAKAHIRO MORISHIMA(Astronomical Institute, Tohoku University)
• MAKOTO HATTORI(Astronomical Institute, Tohoku University)
• MASAHIRO TANAKA(Center for Computational Sciences, University of Tsukuba)
• GLENN H. WHITE(Department of Physical Sciences, The Open University, RALSpace, The Rutherford Appleton Laboratory)
• MIREYA ETXALUZE(Department of Physical Sciences, The Open University, RALSpace, The Rutherford Appleton Laboratory, Centro de Astrobiología (CSIC/INTA), Instituto Nacional de Técnica Aeroespacial)
• HIROSHI SHIBAI(Department of Earth and Space Science, Osaka University)