Dust emission from the early Universe

BROMM, VOLKER; DE ROSSI, MARÍA EMILIA

Congreso; 60a Reunión Anual de la Asociación Argentina de Astronomía; 2017

We constructed analytical models for studying dust emission from the first galaxies, exploring different grain size distributions and chemical compositions. In order to be detectable by current observationalfacilities, model galaxies at z ∼ 10 should exhibit virial masses of M_vir >10**14 M_sun , which is a few  orders of magnitude higher compared to the masses of typical dwarf galaxies at similar redshifts. Our model predicts a significant dependence of observed far-infrared/sub-millimeter (FIR/sub-mm) fluxes on the dust-to-metal ratios, gas metallicities and star formation of the given sources. Thus, measurements of the FIR/sub-mm extragalactic background light produced by galaxy populations at very high z could help to constrain these quantities at early times.