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ISOCAM mapping of the Whirlpool galaxy M 51

We have obtained the first images of the 6.75 and 15 m continuum emission in the Whirlpool galaxy with ISO- CAM, the infrared camera of the ISO 1 . These data reveal the well-developed, spiral arms of the galaxy, in addition to diffuse emission between arms and in the outer regions of the disk. There is a striking correspondence with the 15 m emission and the H emission over the galaxy. We tighten this link by looking at the properties of the individual HII regions and show that the 15 m emission traces massive star formation and is not affected by extinction as is H. The data show systematic mid-infrared color variations perpendicular to the arms, which we interpret as two distinct dust components contributing to the mid-infrared emission. We examine the implication of these color variations in light of our current understanding of dust at these wavelength.