Astrophysics (index)about

direct collapse black hole

(DCBH)
(theoretical means for quick formation of SMBHs)

The term direct collapse black hole (DCBH) refers to a black hole that formed through a single gravitational collapse, e.g., of a massive cloud. The term implies the collapsing material did not first live out a lifetime as a star. The concept is motivated by the existence of black holes more massive than expected, which need an explanation: supermassive black holes (SMBHs) seem larger than possible, given the age of the universe and mechanisms that should limit their accretion rate (Eddington accretion rate) and one theory is that a SMBH might form in a single event that greatly exceeds the limit for a short time, achieving nearly all their current mass at formation time. It is presumed this might have happened in the early universe and high redshift observation data is searched for evidence of already-too-massive SMBHs (e.g., active galactic nuclei) and evidence of such events.

An alternative theory of SMBHs posits the existence of some unknown, long-term way of exceeding the Eddington limit on accretion.

Intermediate-mass black holes (IMBHs) whose existence GW detections have confirmed, would also seem to be candidates for this type of scenario.


(black holes)
https://arxiv.org/abs/1703.03805
http://www.rh.gatech.edu/news/611727/looking-back-time-watch-different-kind-black-hole
http://www.astronomy.com/news/2017/03/how-do-supermassive-black-holes-form

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