scholarly journals Nonaxisymmetric Effects in Black Hole Accretion Inviscid Hydrodynamics: Formation and Evolution of a Tilted Torus

2008 ◽  
Vol 681 (1) ◽  
pp. 58-72 ◽  
Author(s):  
Agnieszka Janiuk ◽  
Daniel Proga ◽  
Ryuichi Kurosawa
Keyword(s):  
Black Hole ◽  
Black Hole Accretion ◽  
Inviscid Hydrodynamics ◽  
Formation And Evolution ◽  
Hole Accretion

scholarly journals Do Current X-Ray Observations Capture Most of the Black-hole Accretion at High Redshifts?

2021 ◽  
Vol 921 (2) ◽  
pp. 170
Author(s):  
Guang Yang ◽  
Vicente Estrada-Carpenter ◽  
Casey Papovich ◽  
Fabio Vito ◽  
Jonelle L. Walsh ◽  
...  
Keyword(s):  
Black Hole ◽  
Star Formation ◽  
Formation Rate ◽  
X Ray ◽  
Black Hole Accretion ◽  
Formation And Evolution ◽  
Predicted Values ◽  
Gas Accretion ◽  
Star Formation Histories ◽  
Hole Accretion

Abstract The cosmic black hole accretion density (BHAD) is critical for our understanding of the formation and evolution of supermassive black holes (BHs). However, at high redshifts (z > 3), X-ray observations report BHADs significantly (∼10 times) lower than those predicted by cosmological simulations. It is therefore paramount to constrain the high-z BHAD using independent methods other than direct X-ray detections. The recently established relation between star formation rate and BH accretion rate among bulge-dominated galaxies provides such a chance, as it enables an estimate of the BHAD from the star formation histories (SFHs) of lower-redshift objects. Using the CANDELS Lyα Emission At Reionization (CLEAR) survey, we model the SFHs for a sample of 108 bulge-dominated galaxies at z = 0.7–1.5, and further estimate the BHAD contributed by their high-z progenitors. The predicted BHAD at z ≈ 4–5 is consistent with the simulation-predicted values, but higher than the X-ray measurements (by ≈3–10 times at z = 4–5). Our result suggests that the current X-ray surveys could be missing many heavily obscured Compton-thick active galactic nuclei (AGNs) at high redshifts. However, this BHAD estimation assumes that the high-z progenitors of our z = 0.7–1.5 sample remain bulge-dominated where star formation is correlated with BH cold-gas accretion. Alternatively, our prediction could signify a stark decline in the fraction of bulges in high-z galaxies (with an associated drop in BH accretion). JWST and Origins will resolve the discrepancy between our predicted BHAD and the X-ray results by constraining Compton-thick AGN and bulge evolution at high redshifts.

The relationship between black hole accretion rate and gas properties at the Bondi radius

2019 ◽  
Vol 15 (S356) ◽  
pp. 214-217
Author(s):  
De-Fu Bu
Keyword(s):  
Black Hole ◽  
Galaxy Formation ◽  
Large Scale ◽  
Accretion Rate ◽  
Black Hole Accretion ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
The Relationship ◽  
Large Scale Simulations ◽  
Hole Accretion

AbstractThe mass accretion rate determines the black hole accretion mode and the corresponding efficiency of active galactic nuclei (AGNs) feedback. In large-scale simulations studying galaxy formation and evolution, the Bondi radius can be at most marginally resolved. In these simulations, the Bondi accretion formula is always used to estimate the black hole accretion rate. The Bondi solution can not represent the real accretion process. We perform 77 simulations with varying density and temperature at Bondi radius. We find a formula to calculate the black hole accretion rate based on gas density and temperature at Bondi radius. We find that the formula can accurately predict the luminosity of observed low-luminosity AGNs. This formula can be used in sub-grid models in large-scale simulations with AGNs feedback.

Iron Fluorescence from within the Innermost Stable Orbit of Black Hole Accretion Disks

1997 ◽  
Vol 488 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Christopher S. Reynolds ◽  
Mitchell C. Begelman
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Stable Orbit ◽  
Black Hole Accretion ◽  
Hole Accretion

Hydrodynamics of Black Hole–Accretion Disk Collision

1998 ◽  
Vol 507 (1) ◽  
pp. 131-144 ◽  
Author(s):  
Pavel B. Ivanov ◽  
Igor V. Igumenshchev ◽  
Igor D. Novikov
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Black Hole Accretion ◽  
Black Hole Accretion Disk ◽  
Hole Accretion

The magnetohydrodynamics of black hole accretion

1986 ◽  
Vol 126 (1) ◽  
pp. 99-104 ◽  
Author(s):  
U. S. Pandey ◽  
G. S. Dubey
Keyword(s):  
Black Hole ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals The Galaxy Zoo survey for giant AGN-ionized clouds: past and present black hole accretion events

2011 ◽  
Vol 420 (1) ◽  
pp. 878-900 ◽  
Author(s):  
William C. Keel ◽  
S. Drew Chojnowski ◽  
Vardha N. Bennert ◽  
Kevin Schawinski ◽  
Chris J. Lintott ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Accretion ◽  
The Galaxy ◽  
Hole Accretion
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