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KETJU SIGNED

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

Total Cost €

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EC-Contrib. €

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Partnership

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 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.

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

Project "KETJU" data sheet

The following table provides information about the project.

Coordinator
HELSINGIN YLIOPISTO 

Organization address
address: YLIOPISTONKATU 3
city: HELSINGIN YLIOPISTO
postcode: 14
website: www.helsinki.fi

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

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    HELSINGIN YLIOPISTO FI (HELSINGIN YLIOPISTO) coordinator 1˙953˙569.00

Map

 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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