picasso: a machine learning model to paint intracluster gas on gravity-only simulations
Conference talk at APS Global Summit 2025, Anaheim, CA
CV
Research positions
- 2021 - present: Postdoctoral Scholar
- Argonne National Laboratory, High Energy Physics division
- Supervisor: Dr. Lindsey Bleem
- Research activities:
- Physics-informed AI/ML emulation of thermodynamic properties of simulated galaxy clusters
- Millimeter-wave sky maps from cosmological simulations
- Multi-wavelength studies of galaxy cluster samples
- Supervision of two post-bachelor internships (6 months to 1 year)
- Junior coordinator of galaxy cluster-related analyses in the SPT-3G collaboration
- 2018 - 2021: Ph.D Student
- Université Grenoble Alpes, Laboratoire de Physique Subatomique et Cosmologie
- Supervisor: Pr. Frédéric Mayet
- Research activities:
- Observations at the IRAM 30-m telescope
- Analysis of NIKA2 raw data
- Analysis of the thermodynamic properties of the intracluster medium
- Mass-observable scaling relations
- Responsible of the NIKA2 collaboration SZ pipeline and SZ database
Education
- Ph.D in Cosmology, Université Grenoble Alpes, 2021
- Master’s degree in Cosmology and Particle Physics, Université de Montpellier, 2018
- Bachelor’s degree in Physics and Chemistry, Université de Bordeaux, 2016
Skills
- Programming
- Python (scipy, astropy, emcee, pymc3)
- JAX ecosystem (Differentiable and GPU-enabled Python)
- IDL, R, Shell scripting, LaTeX
- Parallel computing (multithreading, MPI)
- Version control (git, svn), Documentation (Sphinx),
- Data analysis
- AI/ML: Artificial neural networks (design, training, and application)
- Statistical modelling: Hierarchical models, Forward modelling
- Inference: Bayesian analysis, Monte Carlo Markov chains, Gradient descent regression
- Pipeline design and use of supercomputers to handle large datasets
Public scientific software
- fkeruzore/picasso: Painting intracluster gas on gravity-only simulations
- Gas model combining a parameterized physical model and neural network predictions
- Implemented using JAX and flax, with fully GPU-friendly and differentiable predictions
- Documentation: picasso-cosmo.readthedocs.io
- Publication: Kéruzoré et al., The Open Journal of Astrophysics 7, 116 (2024)
- fkeruzore/panco2: Pressure profile measurements from SZ galaxy cluster maps
- Forward modeling MCMC analysis, enabling taking into account mm-wave systematics
- Tested on simulated Planck, SPT, NIKA2 maps; can be used with any mm-wave data
- Documentation: panco2.readthedocs.io
- Publication: Kéruzoré et al., The Open Journal of Astrophysics 6, 9 (2023)
Collaborations
- Member of the Dark Energy Science Collaboration (DESC) since 2022
- Member of the CMB-S4 collaboration since 2022
- Member of the South Pole Telescope (SPT) collaboration since 2022
- Member of the Galaxy Clusters working group of the SPT collaboration since 2021
- Member of the CHEX-MATE collaboration since 2019
- Member of the NIKA2 collaboration since 2018 (Core team member since 2019)
Teaching
2018-2021: 98 hours of teaching at Université Grenoble Alpes
- Electromagnetism
- 1st year biology & chemistry students
- Tutorials (online & in-person), labs (in-person)
- 56 hours
- Applied thermodynamics
- 3rd year physics students
- Tutorials (online & in-person)
- 30 hours
- Nuclear physics
- 5th year radioprotection students
- Labs (in-person)
- 12 hours
Service and responsibilities
- Junior coordinator of galaxy cluster-related analyses in the SPT-3G collaboration since 2024
- PI of a joint SPT-eROSITA project studying the statistical relations between multi-wavelength galaxy cluster observables since 2022
- Responsible of the NIKA2 collaboration SZ pipeline from 2019 to 2021
- Responsible of the NIKA2 collaboration SZ database from 2019 to 2021
Talks
picasso: a machine learning model to paint intracluster gas on gravity-only simulations
Seminar at Cosmic Physics Center Seminar, Fermi National Accelerator Laboratory, Battavia, IL
picasso: a machine learning model to paint intracluster gas on gravity-only simulations
Conference talk at Cosmology and galaxy astrophysics with simulations and machine learning 2024, Center for Computational Astrophysics/Flatiron Institute, NYC
picasso: a machine learning model to paint intracluster gas on gravity-only simulations
Seminar at KICP Seminar, Kavli Institute for Cosmological Physics/University of Chicago, Chicago, IL
picasso: a machine learning model to paint intracluster gas on gravity-only simulations
Seminar at LPSC Webinar, Laboratoire de Physique Subatomique et Cosmologie, Grenoble, France
picasso: Painting intra-cluster gas on gravity-only simulations
Junior scientist talk at CMB-S4 2023 Summer Collaboration meeting, National Center for Supercomputing Applications/University of Illinois Urbana-Champaign, Urbana, Illinois
Optimization and Quality Assessment of Baryon Pasting for Intracluster Gas using the Borg Cube Simulation
Junior scientist talk at CMB-S4 2023 Summer Collaboration meeting, SLAC National Accelerator Laboratory, Menlo Park, California
Optimization and Quality Assessment of Baryon Pasting for Intracluster Gas using the Borg Cube Simulation
Conference talk at Observing the Universe at millimeter wavelengths, Laboratoire de Physique Subatomique et Cosmologie, Grenoble, France
panco2: pressure profile measurement from tSZ observations in Python
Conference talk at Observing the Universe at millimeter wavelengths, Laboratoire de Physique Subatomique et Cosmologie, Grenoble, France
Mass calibration systematics in Sunyaev-Zeldovich galaxy cluster cosmology
Talk at Argonne HEP Young Scientists Symposium Series, Argonne National Laboratory, Lemont, Illinois
High-resolution NIKA2 SZ observations for cluster cosmology
Seminar at University of Michigan, Ann Arbor, Michigan
Cosmologie à partir des observations Sunyaev-Zeldovich d’amas de galaxies avec NIKA2
Thesis defense at Laboratoire de Physique Subatomique et Cosmologie, Grenoble, France
The Y500-M500 scaling relation from the NIKA2 SZ Large Program
Conference talk at Observing the Universe at millimeter wavelengths, Sapienza University, Rome, Italy
A new software to measure pressure profiles from SZ observations
Conference talk at Observing the Universe at millimeter wavelengths, Sapienza University, Rome, Italy
High-resolution SZ observations for cluster cosmology with NIKA2
Talk at French national colloquim 'Action Dark Energy', Online
High resolution SZ observations for cluster cosmology with NIKA2
Seminar at Institut de Planétologie et d'Astrophysique de Grenoble, Grenoble, France
High resolution SZ observations for cluster cosmology with NIKA2
Seminar at Laboratoire de Physique Subatomique et Cosmologie, Grenoble, France
High resolution SZ observations with the NIKA2 camera
Conference talk at CosmoGold IAP, Institut d'Astrophysique de Paris, Paris, France
ACT-CL J0215.4+0030: a test case for faint galaxy clusters within the NIKA2 SZ Large Program
Conference talk at Observing the Universe at millimeter wavelengths, Laboratoire de Physique Subatomique et Cosmologie, Grenoble, France
Publications
77 publications; 626 citations; h-index: 13 (Source: NASA ADS)
Journal Articles
The picasso gas model: Painting intracluster gas on gravity-only simulations
Kéruzoré, F., Bleem, L. E., Frontiere, N., et al. (2024), The Open Journal of Astrophysics, 7, 116. Link
Optimization and Quality Assessment of Baryon Pasting for Intracluster Gas using the Borg Cube Simulation
Kéruzoré, F., Bleem, L. E., Buehlmann, M., et al. (2023), The Open Journal of Astrophysics, 6, 43. Link
panco2: a Python library to measure intracluster medium pressure profiles from Sunyaev-Zeldovich observations
Kéruzoré, F., Mayet, F., Artis, E., et al. (2023), The Open Journal of Astrophysics, 6, 9. Link
Exploiting NIKA2/XMM-Newton imaging synergy for intermediate-mass high-z galaxy clusters within the NIKA2 SZ large program. Observations of ACT-CL J0215.4+0030 at z ∼ 0.9
Kéruzoré, F., Mayet, F., Pratt, G. W., et al. (2020), Astronomy and Astrophysics, 644, A93. Link
Constraints on Non-Thermal Pressure at galaxy cluster outskirts from a Joint SPT and XMM-Newton Analysis
Sarkar, A., McDonald, M., Bleem, L., et al. (2025), arXiv e-prints, arXiv:2504.00113. Link
The SPT-Deep Cluster Catalog: Sunyaev-Zel'dovich Selected Clusters from Combined SPT-3G and SPTpol Measurements over 100 Square Degrees
Kornoelje, K., Bleem, L. E., Rykoff, E. S., et al. (2025), arXiv e-prints, arXiv:2503.17271. Link
A panchromatic view of N2CLS GOODS-N: the evolution of the dust cosmic density since z~7
Berta, S., Lagache, G., Beelen, A., et al. (2025), arXiv e-prints, arXiv:2503.07706. Link
Multiprobe cosmology from the abundance of SPT clusters and DES galaxy clustering and weak lensing
Bocquet, S., Grandis, S., Krause, E., et al. (2025), Physical Review D, 111, 063533. Link
Measurement and Modeling of Polarized Atmosphere at the South Pole with SPT-3G
Coerver, A., Zebrowski, J. A., Takakura, S., et al. (2025), The Astrophysical Journal, 982, 15. Link
Interpreting millimeter emission from IMEGIN galaxies NGC 2146 and NGC 2976
Ejlali, G., Tabatabaei, F. S., Roussel, H., et al. (2025), Astronomy and Astrophysics, 693, A88. Link
Pointing Accuracy Improvements for the South Pole Telescope with Machine Learning
Chichura, P. M., Rahlin, A., Anderson, A. J., et al. (2024), arXiv e-prints, arXiv:2412.15167. Link
Cosmology From CMB Lensing and Delensed EE Power Spectra Using 2019-2020 SPT-3G Polarization Data
Ge, F., Millea, M., Camphuis, E., et al. (2024), arXiv e-prints, arXiv:2411.06000. Link
Detection of Thermal Emission at Millimeter Wavelengths from Low-Earth Orbit Satellites
Foster, A., Chokshi, A., Anderson, A. J., et al. (2024), arXiv e-prints, arXiv:2411.03374. Link
Exploiting the high-resolution NIKA2 data to study the intracluster medium and dynamical state of ACT-CL J0240.0+0116
Paliwal, A., De Petris, M., Ferragamo, A., et al. (2024), arXiv e-prints, arXiv:2410.11668. Link
SPT clusters with DES and HST weak lensing. II. Cosmological constraints from the abundance of massive halos
Bocquet, S., Grandis, S., Bleem, L. E., et al. (2024), Physical Review D, 110, 083510. Link
SPT clusters with DES and HST weak lensing. I. Cluster lensing and Bayesian population modeling of multiwavelength cluster datasets
Bocquet, S., Grandis, S., Bleem, L. E., et al. (2024), Physical Review D, 110, 083509. Link
First Constraints on the Epoch of Reionization Using the Non-Gaussianity of the Kinematic Sunyaev-Zel'dovich Effect from the South Pole Telescope and Herschel-SPIRE Observations
Raghunathan, S., Ade, P. A. R., Anderson, A. J., et al. (2024), Physical Review Letters, 133, 121004. Link
Testing the ΛCDM Cosmological Model with Forthcoming Measurements of the Cosmic Microwave Background with SPT-3G
Prabhu, K., Raghunathan, S., Millea, M., et al. (2024), The Astrophysical Journal, 973, 4. Link
Flaring Stars in a Nontargeted Millimeter-wave Survey with SPT-3G
Tandoi, C., Guns, S., Foster, A., et al. (2024), The Astrophysical Journal, 972, 6. Link
SPT-SZ MCMF: an extension of the SPT-SZ catalogue over the DES region
Klein, M., Mohr, J. J., Bocquet, S., et al. (2024), Monthly Notices of the Royal Astronomical Society, 531, 3973. Link
Mass calibration of DES Year-3 clusters via SPT-3G CMB cluster lensing
Ansarinejad, B., Raghunathan, S., Abbott, T. M. C., et al. (2024), Journal of Cosmology and Astroparticle Physics, 2024, 024. Link
Reducing Model Error Using Optimised Galaxy Selection: Weak Lensing Cluster Mass Estimation
Rau, M. M., Kéruzoré, F., Ramachandra, N., & Bleem, L. (2024), arXiv e-prints, arXiv:2406.11950. Link
The XXL Survey. LI. Pressure profile and YSZ − M scaling relation in three low-mass galaxy clusters at z ∼ 1 observed with NIKA2
Adam, R., Ricci, M., Eckert, D., et al. (2024), Astronomy and Astrophysics, 684, A18. Link
Faint mm NIKA2 dusty star-forming galaxies: Finding the high-redshift population
Bing, L.-J., Beelen, A., Lagache, G., et al. (2024), Astronomy and Astrophysics, 683, A232. Link
Galaxy Clusters Discovered via the Thermal Sunyaev-Zel'dovich Effect in the 500-square-degree SPTpol Survey
Bleem, L. E., Klein, M., Abbot, T. M. C., et al. (2024), The Open Journal of Astrophysics, 7, 13. Link
The hydrostatic-to-lensing mass bias from resolved X-ray and optical-IR data
Muñoz-Echeverría, M., Macías-Pérez, J. F., Pratt, G. W., et al. (2024), Astronomy and Astrophysics, 682, A147. Link
Measurement of gravitational lensing of the cosmic microwave background using SPT-3G 2018 data
Pan, Z., Bianchini, F., Wu, W. L. K., et al. (2023), Physical Review D, 108, 122005. Link
The stratification of ISM properties in the edge-on galaxy NGC 891 revealed by NIKA2
Katsioli, S., Xilouris, E. M., Kramer, C., et al. (2023), Astronomy and Astrophysics, 679, A7. Link
NIKA2 Cosmological Legacy Survey. Survey description and galaxy number counts
Bing, L., Béthermin, M., Lagache, G., et al. (2023), Astronomy and Astrophysics, 677, A66. Link
Multi-probe analysis of the galaxy cluster CL J1226.9+3332. Hydrostatic mass and hydrostatic-to-lensing bias
Muñoz-Echeverría, M., Macías-Pérez, J. F., Pratt, G. W., et al. (2023), Astronomy and Astrophysics, 671, A28. Link
Candidate cosmic filament in the GJ526 field, mapped with the NIKA2 camera
Lestrade, J.-F., Désert, F.-X., Lagache, G., et al. (2022), Astronomy and Astrophysics, 667, A23. Link
The Cluster HEritage project with XMM-Newton: Mass Assembly and Thermodynamics at the Endpoint of structure formation. I. Programme overview
CHEX-MATE Collaboration, Arnaud, M., Ettori, S., et al. (2021), Astronomy and Astrophysics, 650, A104. Link
Exploring the hydrostatic mass bias in MUSIC clusters: application to the NIKA2 mock sample
Gianfagna, G., De Petris, M., Yepes, G., et al. (2021), Monthly Notices of the Royal Astronomical Society, 502, 5115. Link
GASTON: Galactic Star Formation with NIKA2 - evidence for the mass growth of star-forming clumps
Rigby, A. J., Peretto, N., Adam, R., et al. (2021), Monthly Notices of the Royal Astronomical Society, 502, 4576. Link
The XXL Survey. XLIV. Sunyaev-Zel'dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach
Ricci, M., Adam, R., Eckert, D., et al. (2020), Astronomy and Astrophysics, 642, A126. Link
Calibration and performance of the NIKA2 camera at the IRAM 30-m Telescope
Perotto, L., Ponthieu, N., Macías-Pérez, J. F., et al. (2020), Astronomy and Astrophysics, 637, A71. Link
Unveiling the Merger Dynamics of the Most Massive MaDCoWS Cluster at z = 1.2 from a Multiwavelength Mapping of Its Intracluster Medium Properties
Ruppin, F., McDonald, M., Brodwin, M., et al. (2020), The Astrophysical Journal, 893, 74. Link
Conference Proceedings
Forecasting the Y500 - M500 scaling relation from the NIKA2 SZ Large Program
Kéruzoré, F., Artis, E., Macías-Pérez, J.-F., et al. (2022), mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 Camera, 257, 00025. Link
PANCO2: A new software to measure pressure profiles from resolved thermal SZ observations
Kéruzoré, F., Artis, E., Macías-Pérez, J.-F., et al. (2022), mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 Camera, 257, 00024. Link
A low-mass galaxy cluster as a test-case study for the NIKA2 SZ Large Program
Kéruzoré, F., Adam, R., Ade, P., et al. (2020), mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 Camera, 228, 00012. Link
Plus 37 conference proceedings as a co-author – see the dedicated Publications page for the complete list.
PhD Thesis
Cosmologie à partir des observations Sunyaev-Zeldovich d’amas de galaxies avec NIKA2
F. Kéruzoré (2021), PhD thesis, Université Grenoble Alpes (in French) Link