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The seeds of the first supermassive black holes

Mar Mezcua

Institute of Space Sciences (Barcelona, Spain)

Supermassive black holes of 10^10 solar masses already existed at z~6-7, when the Universe was less than 1 Gyr old. To reach this mass in such a short time they should have started as seed intermediate-mass black holes (IMBHs) of 100-10^6 solar masses at z > 8. I will show that a population of actively accreting IMBHs exists in local dwarf galaxies and that they can be detected out to z~3 with the use of deep multiwavelength surveys. Whether these are the relics of those early seed black holes that did not grow into supermassive is still a matter of debate, since processes such as dwarf galaxy mergers and black hole feedback can have a very strong impact on black hole growth. The next generation of observational facilities such as the SKA could open a new window by detecting seed IMBHs at birth.

Date: Mardi, le 12 juillet 2022
Heure: 14:00
Lieu: Université de Montréal
  Campus MIL - B-2061

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