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    Super-Eddington accretion and feedback from the first massive seed black holes


    Regan, John and Downes, Turlough P. and Volonteri, Marta and Beckmann, Ricarda and Lupi, Alessandro and Trebitsch, Maxime and Dubois, Yohan (2018) 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
    Additional Information: This is the preprint version available at arXiv:1811.04953 . The published version is available at: 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;
    Academic Unit: Faculty of Science and Engineering > Theoretical Physics
    Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 13802
    Identification Number: https://doi.org/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: The Royal Astronomical Society
    Refereed: Yes
    URI:

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