How AGN feedback drives the size growth of the first quasars

Author:

van der Vlugt Dieuwertje1ORCID,Costa Tiago12

Affiliation:

1. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands

2. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, D-85748 Garching b. München, Germany

Abstract

ABSTRACT Quasars at $z = 6$ are powered by accretion on to supermassive black holes with masses $M_{\rm BH} \sim 10^9 \rm \, M_{\odot}$. Their rapid assembly requires efficient gas inflow into the galactic nucleus, sustaining black hole accretion at a rate close to the Eddington limit, but also high central star formation rates. Using a set of cosmological ‘zoom-in’ hydrodynamic simulations performed with the moving mesh code Arepo, we show that $z = 6$ quasar host galaxies develop extremely tightly bound stellar bulges with peak circular velocities $300\!-\!500 \, \rm km \, s^{-1}$ and half-mass radii ${\approx}0.5 \, \rm kpc$. Despite their high binding energy, we find that these compact bulges expand at $z \, \lt \, 6$, with their half-mass radii reaching ${\approx}5 \, \rm kpc$ by $z = 3$. The circular velocity drops by factors of ≈2 from their initial values to $200\!-\!300 \, \rm km \, s^{-1}$ at $z \, \approx \, 3$ and the stellar profile undergoes a cusp-core transformation. By tracking individual stellar populations, we find that the gradual expansion of the stellar component is mainly driven by fluctuations in the gravitational potential induced by bursty AGN feedback. We also find that galaxy size growth and the development of a cored stellar profile does not occur if AGN feedback is ineffective. Our findings suggest that AGN-driven outflows may have profound implications for the internal structure of massive galaxies, possibly accounting for their size growth, the formation of cored ellipticals as well as for the saturation of the MBH–σ⋆ seen at high-velocity dispersions σ⋆.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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