  Axion dark matter thermalizes by gravitational self-interactions and forms a
Bose-Einstein condensate. We show that the rethermalization of the axion fluid
during the initial collapse of large scale overdensities near cosmic dawn
transports angular momentum outward sufficientlly fast that black holes form
with masses ranging from approximately $10^5$ to a few times $10^{10}~M_\odot$.
