Speaker
Description
I.F. Mirabel & L.F. Rodriguez
The existence of supermassive black holes (SMBHs) of ~10^9 solar masses in quasars at z ~7.5, when the Universe was ~700 Myr old, is an intriguing puzzle and their origin remains unconstraint. It have been proposed that those SMBHs result from rapidly growing BH seeds of stellar and/or intermediate masses BHs at redshifts z ~30. However, there is no consensus on whether such extreme rapid mass growth of BHs may be sustainable during the required 600 hundred million years. Direct detections in the mid-infrared of massive BHs in galaxies at z = 7 to 15 with the JWST, and indirect detections of radio loud BH signals in the redshifted 21cm line of HI at z~20 with radio arrays as SKA, may constrain the ultimate origin of the SMBHs observed up to z ~7.5. In this talk, I would discuss these issues along the lines of a review accepted for publication in New Astronomy Reviews, and posted in http://arxiv.org/abs/2203.12741
