Kavli Affiliate: Debora Sijacki
| First 5 Authors: Rosie Y. Talbot, Debora Sijacki, Martin A. Bourne, ,
| Summary:
In this work, we use hydrodynamical simulations to explore the effects of
kinetic AGN jet feedback on the progression and outcome of the major merger of
two isolated, gas-rich galaxies. We present simulations that use the
moving-mesh code AREPO to follow the progression of the merger through first
passage and up to the final coalescence, modelling the black holes at the
centres of both of the merging galaxies using our prescription for black hole
accretion via an $alpha$-disc and feedback in the form of a spin-driven jet.
We find that the jets drive large-scale, multiphase outflows which launch large
quantities of cold gas out to distances greater than 100 kpc and with
velocities that reach $sim 2500 , {rm km , s^{-1}}$. Gas in the outflows
that decelerates, cools and falls back on the galaxies can provide a rich
source of fuel for the black hole, leading to intense episodes of jet activity
in which the jet can become significantly misaligned. The presence of AGN jets
affects the growth of the stellar component: star formation is moderately
suppressed at all times during the merger and the peak of the star formation
rate, attained during the final coalescence of the galaxies, is reduced by a
factor of $sim 2$. Analysis of simulations such as these will play a central
role in making precise predictions for multimessenger investigations of dual
radio-AGN, which next-generation observational facilities such as LISA, Athena
and SKA will make possible.
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