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≳5 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.
@article{arxiv.2001.04303,
title = {Dust emission from the first massive galaxies},
author = {Maria Emilia De Rossi and George H. Rieke and Irene Shivaei and Volker Bromm and Jianwei Lyu},
journal= {arXiv preprint arXiv:2001.04303},
year = {2020}
}
Comments
3 pages, 2 figures. Accepted for publication in BAAA, Vol. 61B, 2020