IR SED broadening in high-z galaxies is driven primarily by luminosity density, requiring ~1.6–1.7 (up to ~2) corrections to modified-blackbody total infrared luminosities.
Dust emission from the first massive galaxies
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abstract
We compare observed far-infrared (FIR) galaxy spectral energy distributions (SEDs) at $z\sim6$ and theoretical predictions for first massive population II (Pop II) galaxies. Observed FIR SEDs at $z\gtrsim5$ are broad and shifted to bluer wavelengths when compared to galaxies at $z\sim3$. By implementing an analytical model for dust emission from Pop II massive galaxies,we were able to reproduce the observed behaviour as a consequence of the high energy densities and silicate-rich dust composition of high-$z$ model galaxies. As noted in a previous work, the non-blackbody nature of galaxy SEDs at $z \sim 6$ should be taken into account when interpreting measurements of FIR luminosities to avoid underestimating star formation rates.
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Determining Total Infrared Luminosities from Submm Measurements of High Redshift Galaxies
IR SED broadening in high-z galaxies is driven primarily by luminosity density, requiring ~1.6–1.7 (up to ~2) corrections to modified-blackbody total infrared luminosities.