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We analyze the infrared (IR) spectral energy distributions (SEDs) for10micron < lambda(rest) < 100micron for ~600 galaxies at z~0.7 in the extendedChandra Deep Field South by stacking their Spitzer 24, 70 and 160micron images.We place interesting constraints on the average IR SED shape in two bins: thebrightest 25% of z~0.7 galaxies detected at 24micron, and the remaining 75% ofindividually-detected galaxies. Galaxies without individual detections at24micron were not well-detected at 70micron and 160micron even throughstacking. We find that the average IR SEDs of z~0.7 star-forming galaxies fallwithin the diversity of z~0 templates. While dust obscuration Lir/Luv seems tobe only a function of star formation rate (SFR; ~ Lir+Luv), not of redshift,the dust temperature of star-forming galaxies (with SFR ~ 10 solar mass peryear) at a given IR luminosity was lower at z~0.7 than today. We suggest aninterpretation of this phenomenology in terms of dust geometry: intenselystar-forming galaxies at z~0 are typically interacting, and host densecentrally-concentrated bursts of star formation and warm dust temperatures. Atz~0.7, the bulk of intensely star-forming galaxies are relatively undisturbedspirals and irregulars, and we postulate that they have large amounts ofwidespread lower-density star formation, yielding lower dust temperatures for agiven IR luminosity. We recommend what IR SEDs are most suitable for modelingintermediate redshift galaxies with different SFRs.

Infrared Spectral Energy Distributions of z~0.7 Star-Forming Galaxies