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The nearby face-on spiral galaxy M101 has been observed with the Far-InfraredSurveyor (FIS) onboard AKARI. The far-infrared four-band images reveal finespatial structures of M101, which include global spiral patterns, giant HIIregions embedded in outer spiral arms, and a bar-like feature crossing thecenter. The spectral energy distribution of the whole galaxy shows the presenceof the cold dust component (18 K) in addition to the warm dust component (55K). The distribution of the cold dust is mostly concentrated near the center,and exhibits smoothly distributed over the entire extent of the galaxy, whereasthe distribution of the warm dust indicates some correlation with the spiralarms, and has spotty structures such as four distinctive bright spots in theouter disk in addition to a bar-like feature near the center tracing the COintensity map. The star-formation activity of the giant HII regions thatspatially correspond to the former bright spots is found to be significantlyhigher than that of the rest of the galaxy. The latter warm dust distributionimplies that there are significant star-formation activities in the entire barfilled with molecular clouds. Unlike our Galaxy, M101 is a peculiar normalgalaxy with extraordinary active star-forming regions.

Spatial Distributions of Cold and Warm Interstellar Dust in M101 Resolved with AKARI/Far-Infrared Surveyor (FIS)