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This paper presents galaxy source counts at 24 microns in the six SpitzerWide-field InfraRed Extragalactic (SWIRE) fields. The source counts arecompared to counts in other fields, and to model predictions that have beenupdated since the launch of Spitzer. This analysis confirms a very steep risein the Euclidean-normalized differential number counts between 2 mJy and 0.3mJy. Variations in the counts between fields show the effects of samplevariance in the flux range 0.5-10 mJy, up to 100% larger than Poisson errors.Nonetheless, a "shoulder" in the normalized counts persists at around 3 mJy.The peak of the normalized counts at 0.3 mJy is higher and narrower than mostmodels predict. In the ELAIS N1 field, the 24 micron data are combined withSpitzer-IRAC data and five-band optical imaging, and these bandmerged data arefit with photometric redshift templates. Above 1 mJy the counts are dominatedby galaxies at z less than 0.3. By 300 microJy, about 25% are between z ~0.3-0.8, and a significant fraction are at z ~ 1.3-2. At low redshifts thecounts are dominated by spirals, and starbursts rise in number density tooutnumber the spirals' contribution to the counts below 1 mJy.

Galaxy Counts at 24 Microns in the SWIRE Fields