Black hole progenitors are predominantly hot and blue at pre-collapse, often Wolf-Rayet stars luminous in ultraviolet, with only a minority as red supergiants, and a direct-collapse rate of about 0.4 per century for a galaxy with 1 solar mass per year star formation.
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Hot blue progenitors of stellar-mass black holes
Black hole progenitors are predominantly hot and blue at pre-collapse, often Wolf-Rayet stars luminous in ultraviolet, with only a minority as red supergiants, and a direct-collapse rate of about 0.4 per century for a galaxy with 1 solar mass per year star formation.