Regan, John, Downes, Turlough P., Volonteri, Marta, Beckmann, Ricarda, Lupi, Alessandro, Trebitsch, Maxime and Dubois, Yohan (2019) Super-Eddington accretion and feedback from the first massive seed black holes. Monthly Notices of the Royal Astronomical Society, 486 (3). pp. 3892-3906. ISSN 1365-2966
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Abstract
Super-Eddington accretion onto massive black hole seeds may be commonplace in the early
Universe, where the conditions exist for rapid accretion. Direct collapse black holes are often
invoked as a possible solution to the observation of super massive black holes (SMBHs) in the
pre-reionisation Universe. We investigate here how feedback, mainly in the form of bipolar
jets, from super-Eddington accreting seed black holes will affect their subsequent growth. We
find that, nearly independent of the mass loading of the bipolar jets, the violent outflows generated by the jets evacuate a region of approximately 0.1 pc surrounding the black hole seed.
However, the jet outflows are unable to break free of the halo and their impact is limited to the
immediate vicinity of the black hole. The outflows suppress any accretion for approximately
a dynamical time. The gas then cools, recombines and falls back to the centre where high
accretion rates are again observed. The overall effect is to create an effective accretion rate
with values of between 0.1 and 0.5 times the Eddington rate. If this episodic accretion rate is
maintained for order 500 million years then the black hole will increase in mass by a factor
of between 3 and 300 but far short of the factor of 104
required for the seeds to become the
SMBHs observed at z > 6. Therefore, direct collapse black holes born into atomic cooling
haloes and which experience strong negative mechanical feedback will require external influences (e.g. rapid major mergers with other haloes) to promote efficient accretion and reach
SMBH masses within a few hundred million years.
Item Type: | Article |
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Additional Information: | Cite as: John A Regan, Turlough P Downes, Marta Volonteri, Ricarda Beckmann, Alessandro Lupi, Maxime Trebitsch, Yohan Dubois, Super-Eddington accretion and feedback from the first massive seed black holes, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 3, July 2019, Pages 3892–3906, https://doi.org/10.1093/mnras/stz1045 |
Keywords: | Cosmology; theory; large-scale structure; first stars; methods: numerical; large-scale structure of Universe, cosmology: theory; |
Academic Unit: | Faculty of Science and Engineering > Research Institutes > Hamilton Institute Faculty of Science and Engineering > Theoretical Physics |
Item ID: | 13802 |
Identification Number: | 10.1093/mnras/stz1045 |
Depositing User: | John Regan |
Date Deposited: | 12 Jan 2021 17:37 |
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society |
Publisher: | Oxford University Press |
Refereed: | Yes |
Related URLs: | |
URI: | https://mural.maynoothuniversity.ie/id/eprint/13802 |
Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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