(Left) PACS 100 μm to MIPS 24 μm flux density ratio as a function of the PACS 100 μm prior catalog flux density. Shaded grey regions show the space density distribution of galaxies observed in the GOODS-S field. In that field, the MIPS 24 μm and PACS 100 μm catalogs reach at 3-σ limit of 20 μJy and 1.2 mJy, respectively. Red dots and orange triangles present the evolution with redshift of the PACS-to-MIPS flux density ratio of ultra-luminous (ULIRGs) and luminous (LIRGs) infrared galaxies, respectively, predicted using the Chary & Elbaz (2001) library. Each symbol corresponds to a given redshift, in intervals of Δz = 0.5. On each track, we indicate on one point its corresponding redshift, as well as as the path followed for increasing redshifts. The dashed black line represents the limit of the parameter space reachable using the MIPS 24 μm catalog available in this field; all the PACS 100 μm sources below this line will have a MIPS 24 μm counterpart in this catalog. (Right) PACS 160 μm to MIPS 24 μm flux density ratio as function of the PACS 160 μm flux density. Symbols and lines are the same as in the left panel.
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