FIR/sub-mm signatures of the first galaxies

DE ROSSI, MARÍA EMILIA; BROMM, VOLKER

Encuentro; 8th FRIENDS OF FRIENDS MEETING; 2018

We construct analytical models for studying dust emission from the first galaxies, exploring different grain size distributions and chemical compositions. For typical dwarf-size galaxies at redshifts z~10, the peak of dust emission occurs at an observed wavelength of ~ 500 micrometers. The predicted flux from these sources is below the capabilities of current and upcoming observatories, but is a target for next-generation telescopes. Our results suggest that primeval galactic systems would contribute to the observed FIR/sub-mm extragalactic background light(EBL), although their imprint is hidden in dominant foregrounds.Considering the strong dependence of our model EBL on the dust-to-metal ratio, we infer that estimates of the FIR/sub-mm EBL could provide important constraints on the amount of dust in the early Universe.p { margin-bottom: 0.08in; }