The $AKARI$ Far-Infrared All-Sky Survey Maps

Abstract

We present a far-infrared all-sky atlas from a sensitive all-sky survey using the Japanese $AKARI$ satellite. The survey covers $>99$% of the sky in four photometric bands centred at 65 $\hat{I}¼$m, 90 $\hat{I}¼$m, 140 $\hat{I}¼$m, and 160 $\hat{I}¼$m with spatial resolutions ranging from 1 to 1.5 arcmin. These data provide crucial information for the investigation and characterisation of the properties of dusty material in the Interstellar Medium (ISM), since significant portion of its energy is emitted between $\sim$50 and 200 $\hat{I}¼$m. The large-scale distribution of interstellar clouds, their thermal dust temperatures and column densities, can be investigated with the improved spatial resolution compared to earlier all-sky survey observations. In addition to the point source distribution, the large-scale distribution of ISM cirrus emission, and its filamentary structure, are well traced. We have made the first public release of the full-sky data to provide a legacy data set for use by the astronomical community.

22 pages, 18 figures, accepted to PASJ