Month: September 2022

MASSIVE BLACK HOLES. “The MMH grows by a factor of 30 over 30 Myr as it virializes. The LWH experiences two rapid growth events.” (MMH = most massive halo; LWH = Lyman–Werner radiation flux). https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn

FORMATION OF MASSIVE BLACK HOLES. “Most of the accreted matter originates from the parent filament, a major merger and several minor halo mergers. This rapid convergence of matter below the atomic-cooling limit is a prediction of the standard cold dark-matter paradigm, and in conflict with cosmologies that suppress power below the atomic-cooling limit. Nevertheless, rapid convergence is rare, occurring in only about 0.03% of haloes with similar masses and that exist in an large-scale overdense environment.” Worth the effort! https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn

BLACK HOLE MERGERS. “We find that major mergers are the dominant mechanism for preventing population III star formation in these haloes.” https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn

BLACK HOLE CRITICAL POINT. “The simulations follow the evolution of the target haloes until they reach a density of 10(-15) g cm(-3), at which point it is certain that a collapsed object will form. Both haloes form a gravitationally unstable core.” https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn

BLACK HOLE HALO. “The MMH grows gradually after its rapid growth event, which allows the system to form a rotationally supported disk that is cold (300 K) compared to the surrounding gas (10,000 K).” (MMH = most massive halo). https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn

BLACK HOLE CLUMPING. “The medium within the cold disk is turbulent, which causes numerous weak shocks. The disk then fragments into three clumps, which all of which proceed to collapse because thermal pressure and rotational forces cannot counteract the gravitational forces of the clumps.” https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn

BLACK HOLE FORMATION. “The morphology of the LWH is completely different from that of the MMH because of a recent major merger. The collision causes a sheet-like overdensity that cools to 300 K, becoming gravitationally unstable to fragmentation. A single clump fragments from the sheet and undergoes catastrophic collapse. All clumps in both target haloes have masses of around 10(3) Mʘ.” (Mʘ = solar mass; MMH = most massive halo; LWH = Lyman–Werner radiation flux). https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn

DIRECT-COLLAPSE BACK HOLES. “Given that overdense regions make up only 0.01%–0.1% of the Universe, the global number density of DCBH formation is predicted to be 10(-7) –10(-6) Mpc(-3) (co-moving), 100–1,000 times higher than previous estimates.” (DCBH = direct-collapse black holes). https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn