Dust emission from first luminous sources in the early Universe

BROMM, VOLKER; DE ROSSI, MARÍA EMILIA

Conferencia; The Rise of Metals and Dust in Galaxies through Cosmic Time; 2020

Luminous sources at high redshifts, such as the first galaxies, constitute promising  targets for next-generation surveys as they provide unique tools to test models of  early structure formation. We explore the possibility of detecting FIR/sub-mm signatures  of the first galaxies by implementing an analytical model of primordial dust emission.  According to our findings, primeval galaxies would contribute to the observed FIR/sub-mm EBL,  although their imprint is hidden in dominant foregrounds. Our results also suggest that  systems of a given virial mass at z>7 would exhibit larger dust luminosities at higher z,  as a consequence of the increase in dust temperature driven by the higher temperature floor set  by the CMB. In addition, high-z systems are more concentrated, which enhances the heating  efficiency associated with stellar radiation.  Although predicted fluxes of typical galaxies at z~10 are below the capabilities of current observatories, they will become a target for  next-generation telescopes. Considering the strong dependence of the predicted FIR/sub-mm radiation on the nature of primordial dust, future FIR/sub-mm campaigns could play a crucial role in exploring the nature of the ISM and star formation in the early universe.