Dust emission from the first massive galaxies
Abstract
We compare observed far-infrared (FIR) galaxy spectral energy distributions (SEDs) at z6 and theoretical predictions for first massive population II (Pop II) galaxies. Observed FIR SEDs at z5 are broad and shifted to bluer wavelengths when compared to galaxies at z3. 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 6 should be taken into account when interpreting measurements of FIR luminosities to avoid underestimating star formation rates.
0