The critical radiation intensity for direct collapse black hole formation: dependence on the radiation spectral shape

  title={The critical radiation intensity for direct collapse black hole formation: dependence on the radiation spectral shape},
  author={Kazuyuki Sugimura and Kazuyuki Omukai and Akio K. Inoue},
  journal={Monthly Notices of the Royal Astronomical Society},
It has been proposed that supermassive black holes (SMBHs) are originated from direct-collapse black holes (DCBHs) that are formed at z & 10 in the primordial gas in the case that H2 cooling is suppressed by strong external radiation. In this work, we study the critical specific intensity J crit required for DCBH formation for various radiation spectral shapes by a series of one-zone calculations of a collapsing primordialgas cloud. We calculate the critical specific intensity at the Lyman… 

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