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We study the far-infrared emission from the nearby spiral galaxy M33 in orderto investigate the dust physical properties such as the temperature and theluminosity density across the galaxy. Taking advantage of the unique wavelengthcoverage (100, 160, 250, 350 and 500 micron) of the Herschel Space Observatoryand complementing our dataset with Spitzer-IRAC 5.8 and 8 micron andSpitzer-MIPS 24 and 70 micron data, we construct temperature and luminositydensity maps by fitting two modified blackbodies of a fixed emissivity index of1.5. We find that the 'cool' dust grains are heated at temperatures between 11and 28 K with the lowest temperatures found in the outskirts of the galaxy andthe highest ones in the center and in the bright HII regions. Theinfrared/submillimeter total luminosity (5 - 1000 micron) is estimated to be1.9x10^9 Lsun. 59% of the total luminosity of the galaxy is produced by the'cool' dust grains (~15 K) while the rest 41% is produced by 'warm' dust grains(~55 K). The ratio of the cool-to-warm dust luminosity is close to unity(within the computed uncertainties), throughout the galaxy, with the luminosityof the cool dust being slightly enhanced in the center of the galaxy.Decomposing the emission of the dust into two components (one emitted by thediffuse disk of the galaxy and one emitted by the spiral arms) we find that thefraction of the emission in the disk in the mid-infrared (24 micron) is 21%,while it gradually rises up to 57% in the submillimeter (500 micron). We findthat the bulk of the luminosity comes from the spiral arm network that produces70% of the total luminosity of the galaxy with the rest coming from the diffusedust disk. The 'cool' dust inside the disk is heated at a narrow range oftemperatures between 18 and 15 K (going from the center to the outer parts ofthe galaxy).

Cool and warm dust emission from M33 (HerM33es)