S. McAlpine
The link between galaxy and black hole growth in the eagle simulation
McAlpine, S.; Bower, R.G.; Harrison, C.M.; Crain, R.A.; Schaller, M.; Schaye, J.; Theuns, T.
Authors
R.G. Bower
C.M. Harrison
R.A. Crain
M. Schaller
J. Schaye
Professor Tom Theuns tom.theuns@durham.ac.uk
Professor
Abstract
We investigate the connection between the star formation rate (SFR) of galaxies and their central black hole accretion rate (BHAR) using the EAGLE cosmological hydrodynamical simulation. We find, in striking concurrence with recent observational studies, that the 〈SFR〉–BHAR relation for an active galactic nucleus (AGN)-selected sample produces a relatively flat trend, whilst the 〈BHAR〉–SFR relation for an SFR-selected sample yields an approximately linear trend. These trends remain consistent with their instantaneous equivalents even when both SFR and BHAR are time averaged over a period of 100 Myr. There is no universal relationship between the two growth rates. Instead, SFR and BHAR evolve through distinct paths that depend strongly on the mass of the host dark matter halo. The galaxies hosted by haloes of mass M200 ≲ 1011.5 M⊙ grow steadily, yet black holes (BHs) in these systems hardly grow, yielding a lack of correlation between SFR and BHAR. As haloes grow through the mass range 1011.5 ≲ M200 ≲ 1012.5 M⊙ BHs undergo a rapid phase of non-linear growth. These systems yield a highly non-linear correlation between the SFR and BHAR, which are non-causally connected via the mass of the host halo. In massive haloes (M200 ≳ 1012.5 M⊙), both SFR and BHAR decline on average with a roughly constant scaling of SFR/BHAR ∼ 103. Given the complexity of the full SFR–BHAR plane built from multiple behaviours, and from the large dynamic range of BHARs, we find the primary driver of the different observed trends in the 〈SFR〉–BHAR and 〈BHAR〉–SFR relationships are due to sampling considerably different regions of this plane.
Citation
McAlpine, S., Bower, R., Harrison, C., Crain, R., Schaller, M., Schaye, J., & Theuns, T. (2017). The link between galaxy and black hole growth in the eagle simulation. Monthly Notices of the Royal Astronomical Society, 468(3), 3395-3407. https://doi.org/10.1093/mnras/stx658
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 14, 2017 |
Online Publication Date | Mar 16, 2017 |
Publication Date | Jul 1, 2017 |
Deposit Date | Jul 18, 2017 |
Publicly Available Date | Jul 18, 2017 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 468 |
Issue | 3 |
Pages | 3395-3407 |
DOI | https://doi.org/10.1093/mnras/stx658 |
Public URL | https://durham-repository.worktribe.com/output/1373764 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
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