Ginolfi, M.M.GinolfiSchneider, R.R.SchneiderVALIANTE, ROSAROSAVALIANTEPezzulli, E.E.PezzulliGraziani, L.L.GrazianiFujimoto, S.S.FujimotoMaiolino, R.R.Maiolino2021-01-052021-01-0520190035-8711http://hdl.handle.net/20.500.12386/29497Here we explore the infrared (IR) properties of the progenitors of high-z quasar host galaxies. Adopting the cosmological, data-constrained semi-analytic model GAMETE/QSOdust, we simulate several independent merger histories of a luminous quasar at z ∼ 6, following black hole growth and baryonic evolution in all its progenitor galaxies. We find that a fraction of progenitor galaxies (about 0.4 objects per single luminous quasar) at 6.5 < z < 8 has an IR luminosity of L<SUB>IR</SUB> > 10<SUP>13</SUP> L<SUB>☉</SUB> (hyper-luminous IR galaxies; HyLIRGs). HyLIRGs progenitors reside in the most massive haloes, with dark matter (DM) masses of M<SUB>DM</SUB> ∼ 10<SUP>12.5</SUP>-10<SUP>13 </SUP> M<SUB>☉</SUB>. These systems can be easily observed in their ∼1 mm-continuum emission in a few seconds of integration time with the Atacama Large Millimeter/submillimeter Array, and at least 40 per cent of them host nuclear black hole activity that is potentially observable in the soft and hard X-ray band. Our findings are in line with recent observations of exceptional massive DM haloes hosting HyLIRGs at z ∼ 7, suggesting that z ∼ 6 luminous quasars are indeed the signposts of these observed rare peaks in the high-z cosmic density field, and that massive IR-luminous galaxies at higher z are their natural ancestors.STAMPAenArticle10.1093/mnras/sty32052-s2.0-85068905930000462251000093https://academic.oup.com/mnras/article-abstract/483/1/1256/52110822019MNRAS.483.1256GFIS/05 - ASTRONOMIA E ASTROFISICA