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Post-Newtonian modelling of the dynamics of supermassive black holes in galactic-scale hydrodynamical simulations (KETJU)

Total Cost €


EC-Contrib. €






 KETJU project word cloud

Explore the words cloud of the KETJU project. It provides you a very rough idea of what is the project "KETJU" about.

ketju    separations    regions    accretion    galaxies    newtonian    simulation    resolve    unprecedented    suited    full    local       clusters    holes    realise    theoretical    body    lisa    wave    agency    particles    black    2016    first    detection    algorithmic    gws    sub    dynamical    dynamics    centres    gaseous    astronomy    chain    multiple    observatories    radii    gas    breakthrough    masses    regularisation    finnish    ideally    gadget    frequency    smbhs    binaries    structure    schwarzschild    time    predictions    supermassive    goals    prediction    code    realistic    amplitude    direct    massive    space    smbh    unusually    science    gw    surrounding    astrophysical    unable    codes    parsec    feedback    global    uh    word    accuracy    gravitational    universe    technique    friction    modelled    post    single    spectacular    interactions    picture    background    versatile    lambda    nuclear    era    simultaneously    cdm    softened    accurate    found    team    scales    borne    10    mergers    cosmological    emission    accurately    paving    extragalactic    stellar    solving    remaining    cores    galactic    grow   

Project "KETJU" data sheet

The following table provides information about the project.


Organization address
postcode: 14

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Finland [FI]
 Total cost 1˙953˙569 €
 EC max contribution 1˙953˙569 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2018-COG
 Funding Scheme ERC-COG
 Starting year 2019
 Duration (year-month-day) from 2019-07-01   to  2024-06-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

Supermassive black holes (SMBHs) with masses in the range ~10^6-10^10 M⊙ are found at the centres of all massive galaxies in the Local Universe. In the ΛCDM picture of structure formation galaxies grow bottom-up through mergers and gas accretion, leading to multiple SMBHs in the same stellar system. Current simulation codes are unable to resolve in a single simulation the full SMBH merging process, which involves dynamical friction, three-body interactions and finally gravitational wave (GW) emission. KETJU will provide a significant breakthrough in SMBH research by following for the first time accurately global galactic-scale dynamical and gaseous astrophysical processes, while simultaneously solving the dynamics of SMBHs, SMBH binaries and surrounding stellar systems at sub-parsec scales. Our code KETJU (the word for 'chain' in Finnish) is built on the GADGET-3 code and it includes regions around every SMBH in which the dynamics of SMBHs and stellar particles is modelled using a non-softened Post-Newtonian algorithmic chain regularisation technique. The remaining simulation particles far from the SMBHs are evolved using softened GADGET-3. Using KETJU we can study at unprecedented accuracy the dynamics of SMBHs to separations of ~10 Schwarzschild radii, the formation of cores in massive galaxies, the formation of nuclear stellar clusters and finally provide a realistic prediction for the amplitude and frequency distribution of the cosmological gravitational wave background. The UH theoretical extragalactic team is ideally suited for this project, as it has an unusually versatile background in modelling the dynamics, feedback and merging of SMBHs. KETJU is also particularly timely, as the spectacular direct detection of GWs in 2016 is paving the way for a new era in gravitational wave astronomy. Future space-borne GW observatories, such as the European Space Agency's LISA, require accurate global GW predictions in order to fully realise their science goals.

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The information about "KETJU" are provided by the European Opendata Portal: CORDIS opendata.

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