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With appropriate spatial resolution, images of spiral galaxies in thermalinfrared (~10 micron and beyond) often reveal a bright central component,distinct from the stellar bulge, superimposed on a disk with prominent spiralarms. ISO and Spitzer studies have shown that much of the scatter in themid-infrared colors of spiral galaxies is related to changes in the relativeimportance of these two components, rather than to other modifications, such asthe morphological type or star formation rate, that affect the properties ofthe galaxy as a whole. With the Herschel imaging capability from 70 to 500micron, we revisit this two-component approach at longer wavelengths, to see ifit still provides a working description of the brightness distribution ofgalaxies, and to determine its implications on the interpretation of globalfar-infrared properties of galaxies.

The central region of spiral galaxies as seen by Herschel. M81, M99 and M100