2020/01/13 by M. E. De Rossi, De Rossi, Maria Emilia, G. H. Rieke +7
Physics and Astronomy · Engineering · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #CCD and CMOS Imaging Sensors
paper · pdf · doi:10.48550/arxiv.2001.04303
We compare observed far-infrared (FIR) galaxy spectral energy distributions (SEDs) at z∼6 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∼3. 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.