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Massive Population II galaxies undergoing the first phase of vigorous starformation after the initial Population III stage should have high energydensities and silicate-rich interstellar dust. We have modeled the resultingfar-infrared spectral energy distributions (SEDs), demonstrating that they areshifted substantially to bluer (`warmer') wavelengths relative to the bestfitting ones at z ~ 3, and with strong outputs in the 10 - 40 micron range.When combined with a low level of emission by carbon dust, their SEDs matchthat of Haro 11, a local moderately-low-metallicity galaxy undergoing a veryyoung and vigorous starburst that is likely to approximate the relevantconditions in young Population II galaxies. We expect to see similar SEDs athigh redshifts (z >= 5) given the youth of galaxies at this epoch. In fact, wefind a progression with redshift in observed galaxy SEDs, from those resemblinglocal ones at 2 < z < 4 to a closer resemblance with Haro 11 at 5 < z < 7. Inaddition to the insight on conditions in high redshift galaxies, this resultimplies that estimates of the total infrared luminosities at z ~ 6 based onmeasurements near lambda ~ 1 mm can vary by factors of 2 - 4, depending on theSED template used. Currently popular modified blackbodies or local templatescan result in significant underestimates compared with the preferred templatebased on the SED of Haro 11.

The Far Infrared Emission of the First Massive Galaxies