A5053685371- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Astrophysics and Star Formation Studies
- Relativity and Gravitational Theory
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Advanced Clustering Algorithms Research
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- History and Developments in Astronomy
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Quantum Chromodynamics and Particle Interactions
- Adaptive optics and wavefront sensing
- High-Energy Particle Collisions Research
Leiden University
2022-2025
ABSTRACT We introduce the Virgo Consortium’s FLAMINGO suite of hydrodynamical simulations for cosmology and galaxy cluster physics. To ensure are sufficiently realistic studies large-scale structure, subgrid prescriptions stellar AGN feedback calibrated to observed low-redshift mass function gas fractions. The calibration is performed using machine learning, separately each FLAMINGO’s three resolutions. This approach enables specification model by observables which they calibrated. accounts...
To fully take advantage of the data provided by large-scale structure surveys, we need to quantify potential impact baryonic effects, such as feedback from active galactic nuclei (AGN) and star formation, on cosmological observables. In simulations, processes originate scales that remain unresolved. Therefore, they be sourced via subgrid models contain free parameters. We use machine learning calibrate AGN stellar for FLAMINGO (Fullhydro Large-scale simulations with All-sky Mapping...
Abstract Large-scale structure surveys have reported measurements of the density matter, Ωm, and amplitude clustering, σ8, that are in tension with values inferred from observations cosmic microwave background. While this may be a sign new physics slows growth at late times, strong astrophysical feedback processes could also responsible. In work, we argue not independent cosmology their coupling naturally leads to stronger baryonic cosmological models suppressed formation or when combined...
ABSTRACT A number of recent studies have found evidence for a tension between observations large-scale structure (LSS) and the predictions standard model cosmology with cosmological parameters fit to cosmic microwave background (CMB). The origin this ‘S8 tension’ remains unclear, but possibilities include new physics beyond model, unaccounted systematic errors in observational measurements and/or uncertainties role that baryons play. Here, we carefully examine latter possibility using...
ABSTRACT Active galactic nucleus (AGN) feedback from accreting supermassive black holes (SMBHs) is an essential ingredient of galaxy formation simulations. The orbital evolution SMBHs affected by dynamical friction that cannot be predicted self-consistently contemporary simulations in representative volumes. Instead, such typically use a simple ‘repositioning’ SMBHs, but the effects this approach on SMBH and properties have not yet been investigated systematically. Based suite smoothed...
We introduce the Virgo Consortium's FLAMINGO suite of hydrodynamical simulations for cosmology and galaxy cluster physics. To ensure are sufficiently realistic studies large-scale structure, subgrid prescriptions stellar AGN feedback calibrated to observed low-redshift mass function gas fractions. The calibration is performed using machine learning, separately three resolutions. This approach enables specification model by observables which they calibrated. accounts a number potential...
ABSTRACT The splashback radius, coinciding with the minimum in dark matter radial density gradient, is thought to be a universal definition of edge halo. Observational methods detect it have traced using weak gravitational lensing or galaxy number counts. Recent attempts also claimed detection similar feature Sunyaev–Zel’dovich (SZ) observations hot intracluster gas. Here, we use FLAMINGO simulations investigate whether an extremum gradient position radius predicted occur cluster gas...
ABSTRACT Motivated by the recent JWST discovery of galaxy overdensities during Epoch Reionzation, we examine physical properties high-z protoclusters and their evolution using Full-hydro Large-scale structure simulations with All-sky Mapping for Interpretation Next Generation Observations (FLAMINGO) simulation suite. We investigate impact apertures used to define protoclusters, because heterogeneous in literature have limited our understanding population. Our results are insensitive...
ABSTRACT Weak gravitational lensing convergence peaks, the local maxima in weak maps, have been shown to contain valuable cosmological information complementary commonly used two-point statistics. To exploit full power of for cosmology, we must model baryonic feedback processes because these reshape matter distribution on non-linear and mildly scales. We study impact physics number density peaks using FLAMINGO hydrodynamical simulation suite. generate ray-traced full-sky maps mimicking...
Large-scale structure surveys have reported measurements of the density matter, $\Omega_\mathrm{m}$, and amplitude clustering, $\sigma_8$, that are in tension with values inferred from observations cosmic microwave background. While this may be a sign new physics slows growth at late times, strong astrophysical feedback processes could also responsible. In work, we argue not independent cosmology their coupling naturally leads to stronger baryonic cosmological models suppressed formation or...
Abstract Galaxy cluster counts have historically been important for the measurement of cosmological parameters and upcoming surveys will greatly reduce statistical errors. To exploit potential current future surveys, theoretical uncertainties on predicted abundance must be smaller than Models used to predict typically combine a model dark matter only (DMO) halo mass function (HMF) with an observable – relation that is assumed power-law lognormal scatter. We use FLAMINGO suite hydrodynamical...
Abstract Weak gravitational lensing (WL) convergence peaks contain valuable cosmological information in the regime of non-linear collapse. Using FLAMINGO suite hydrodynamical simulations, we study physical origin and redshift distributions objects generating WL selected from a map mimicking Euclid signal. We match to individual haloes show that high signal-to-noise ratio (SNR > 5) measured by Stage IV surveys primarily trace M200c 1014 M⊙ haloes. find peak sample can compete with...
Abstract Energetic feedback processes associated with accreting supermassive black holes can expel gas from massive haloes and significantly alter various measures of clustering on ∼Mpc scales, potentially biasing the values cosmological parameters inferred analyses large-scale structure (LSS) if not modelled accurately. Here we use state-of-the-art FLAMINGO suite hydrodynamical simulations to gauge impact by comparing Planck + ACT stacking measurements kinetic Sunyaev-Zel’dovich (kSZ)...
ABSTRACT Galaxy clusters are important probes for both cosmology and galaxy formation physics. We test the cosmological, hydrodynamical FLAMINGO (Full-hydro large-scale structure simulations with all-sky mapping interpretation of next generation observations) by comparing to observations gaseous properties measured from X-ray observations. contains unprecedented numbers massive groups ($\gt 10^6$) 10^5$) includes variations in predict evolution cluster scaling relations as well radial...
Abstract The resonant conversion, within the inter-galactic medium, of regular photons into dark amplifies anisotropy observed in CMB, thereby imposing stringent constraints on existence light photons. In this study, we investigate impact photons, with masses range 3 × 10 -15 eV < m A ' -12 power spectrum temperature anisotropies cosmic microwave background (CMB) radiation utilizing state-of-the-art large-volume FLAMINGO cosmological simulations. Our results show that using full Planck...
Cosmological simulations are essential for inferring cosmological and galaxy population properties based on forward-modelling, but this typically requires finding the of (sub)haloes galaxies that they contain. The said populations vary depending algorithm used to find them, which is concerning as it may bias key statistics. We compare how predicted (sub)halo mass functions, satellite radial distributions correlation functions across algorithms in dark-matter-only hydrodynamical versions...
Abstract The effect of baryon physics associated with galaxy formation onto the large-scale matter distribution Universe is a key uncertainty in theoretical modelling required for interpretation Stage IV cosmology surveys. We use Flamingo suite simulations to study response due total power spectrum. find that it only well converged simulation volumes excess 2003 Mpc3. report results varying feedback intensity, which either match X-ray inferred gas fractions clusters and z = 0 stellar mass...
To fully take advantage of the data provided by large-scale structure surveys, we need to quantify potential impact baryonic effects, such as feedback from active galactic nuclei (AGN) and star formation, on cosmological observables. In simulations, processes originate scales that remain unresolved. Therefore, they be sourced via subgrid models contain free parameters. We use machine learning calibrate AGN stellar for FLAMINGO hydrodynamical simulations. Using Gaussian process emulators...
ABSTRACT Weak lensing of the cosmic microwave background is rapidly emerging as a powerful probe neutrinos, dark energy, and new physics. We present fast computation non-linear CMB power spectrum that combines perturbation theory at early times with emulation using cosmological simulations late times. Comparing our calculation light-cones from FLAMINGO 5.6 Gpc cube dark-matter-only simulation, we confirm its accuracy to $1{{\ \rm per\ cent}}$ ($2{{\ cent}}$) up multipoles L = 3000 (L 5000)...
swift-emulator is a Python toolkit for using Gaussian processes machine learning to emulate scaling relations from cosmological simulations.swift-emulator focusses on implementing clear, easy use design and API remove the barrier entry emulator techniques.swift-emulator provides tools every step: of parameter sampling, training process model, validating anaylsing trained emulators.By making these techniques easier use, in particular combination with SWIFT code (Borrow & Borrisov,...
Motivated by the recent JWST discovery of galaxy overdensities during Epoch Reionzation, we examine physical properties high-$z$ protoclusters and their evolution using FLAMINGO simulation suite. We investigate impact apertures used to define protoclusters, because heterogeneous in literature have limited our understanding population. Our results are insensitive uncertainties subgrid models at a given resolution, whereas further investigation into dependence on numerical resolution is...
The effect of baryon physics associated with galaxy formation onto the large-scale matter distribution Universe is a key uncertainty in theoretical modelling required for interpretation Stage IV cosmology surveys. We use FLAMINGO suite simulations to study response due total power spectrum. find that it only well converged simulation volumes excess $(200~Mpc)^3$. report results varying feedback intensity, which either match X-ray inferred gas fractions clusters and z=0 stellar mass function,...
Weak lensing of the cosmic microwave background is rapidly emerging as a powerful probe neutrinos, dark energy, and new physics. We present fast computation non-linear CMB power spectrum which combines perturbation theory at early times with emulation using cosmological simulations late times. Comparing our calculation lightcones from FLAMINGO 5.6 Gpc cube dark-matter-only simulation, we confirm its accuracy to 1% (2%) up multipoles L = 3000 (L 5000) for nuLambdaCDM cosmology consistent...
Galaxy clusters are important probes for both cosmology and galaxy formation physics. We test the cosmological, hydrodynamical FLAMINGO simulations by comparing to observations of gaseous properties measured from X-ray observations. contains unprecedented numbers massive groups ($>10^6$) ($>10^5$) includes variations in predict evolution cluster scaling relations as well radial profiles temperature, density, pressure, entropy, metallicity different masses redshifts. show that differences...
Weak gravitational lensing convergence peaks, the local maxima in weak maps, have been shown to contain valuable cosmological information complementary commonly used two-point statistics. To exploit full power of for cosmology, we must model baryonic feedback processes because these reshape matter distribution on non-linear and mildly scales. We study impact physics number density peaks using FLAMINGO hydrodynamical simulation suite. generate ray-traced full-sky maps mimicking...