Fig. 10

The luminosity map of M 33 produced by the “cool” dust grains. Luminosities fainter than 7 L⊙ pc-2 (yellow areas) are found in the outer diffuse parts of the galaxy, while higher luminosities trace the spiral arms (orange/red areas). The highest luminosity densities (>90 L⊙ pc-2; innermost contours; blue areas) are produced in the bright HII regions and the center of the galaxy.
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