gravitationally collapsed objects that preclude escape from
~ 100 million solar masses
less than the solar system
the nuclei of many galaxies, both active and dormant
via the rapid motion of radiating matter tightly orbiting around
the black hole as revealed by optical, radio and X-ray spectral line features,
especially definitive with upcoming X-ray missions
|What is their origin?
The mass characteristic of the earliest gravitationally
bound "seed" objects is much too small.
A plausible solution:
initial radiationless rapid growth via the smothering accretion
of amply available ambient matter, ended by a likely X-radiating phase
of slower growth.
investigate the faintest individual sources of the presently unresolved
residual cosmic X-ray background for evidence of a large new population
signaling the birth of supermassive black hole galactic nuclei.