San Han
Postdoc, IAP, CNRS
About
Hello! I am a postdoc in Institut d'Astrophysique de Paris (IAP). I'm interested in studying evolution of galaxies using numerical methods.
Current Research
Implementating cosmic ray physics
I'm working on implementing the cosmic ray physics to the hydrodynamical simulation code Dyablo.
High-resolution zoom-in simulation of a galaxy cluster
NewCluster is a zoom-in simulation of a region around a galaxy cluster with Mvir ~ 5 × 1014 M☉. It has a spatial resolution of ~70 pc and mass resolution of ~2 × 104 M☉ for stars, and ~1.3 × 106 M☉ for dark matter. This simulation provides unprecedented details for systems at this scale and is expected to become a valuable information for researchers interested in studying high-density environments in the universe. The simulation aims to realistically reproduce the evolution of the high-density region of the universe starting from the initial condition of z = 50 down to local redshift. NewCluster includes many state-of-the-art astrophysical prescriptions, such as supernovae type II and Ia, stellar winds, thermo-turbuent star formation, and dual-mode AGN feedback.
Improving astrophysical simulation code RAMSES
RAMSES uses MPI-based multiprocessing, which is inefficient at very large number of cores (~10,000). I am working on implementing OpenMP in RAMSES to construct hybrid paralleism, which greatly increases scalability of the code.
Publications
[ADS] · [ORCID] · [Google Scholar]
First Authorship (3)
RAMSES-yOMP: Performance Optimizations for the Astrophysical Hydrodynamic Simulation Code RAMSES
Han, S.; Dubois, Y.; Lee, J.; Kim, J.; Cadiou, C.; Yi, S., 2025, ApJ, 978, 96 [ADS] [DOI] [arXiv] [HTML]
On the Origin of the Variety of Velocity Dispersion Profiles of Galaxies
Han, S.; Yi, S.; Oh, S.; Pak, M.; Croom, S.; Devriendt, J.; Dubois, Y.; Kimm, T.; Kraljic, K.; Pichon, C.; Volonteri, M., 2024, ApJ, 968, 96 [ADS] [DOI] [arXiv] [HTML]
YZiCS: Preprocessing of Dark Halos in the Hydrodynamic Zoom-in Simulation of Clusters
Han, S.; Smith, R.; Choi, H.; Cortese, L.; Catinella, B.; Contini, E.; Yi, S., 2018, ApJ, 866, 78 [ADS] [DOI] [arXiv] [HTML]
Co-authorship (12)
Born to be Starless: Revisiting the Missing Satellite Problem
Jeon, S.; Yi, S.; Contini, E.; Dubois, Y.; Han, S.; Kraljic, K.; Peirani, S.; Pichon, C.; Rhee, J., 2025, ApJ, 988, 136 [ADS] [DOI] [arXiv] [HTML]
A super-Eddington-accreting black hole ~1.5 Gyr after the Big Bang observed with JWST
Suh, H.; Scharwächter, J.; Farina, E.; Loiacono, F.; Lanzuisi, G.; Hasinger, G.; Marchesi, S.; Mezcua, M.; Decarli, R.; Lemaux, B.; Volonteri, M.; Civano, F.; Yi, S.; Han, S.; Rawlings, M.; Hung, D., 2025, NatAs, 9, 271 [ADS] [DOI] [arXiv] [HTML]
On the Origin of Star Formation Quenching of Galaxies in Group Environments Using the NewHorizon Simulation
Rhee, J.; Yi, S.; Ko, J.; Contini, E.; Jang, J.; Jeon, S.; Han, S.; Pichon, C.; Dubois, Y.; Kraljic, K.; Peirani, S., 2024, ApJ, 971, 111 [ADS] [DOI] [arXiv] [HTML]
Galaxies with grains: unraveling dust evolution and extinction curves with hydrodynamical simulations
Dubois, Y.; Rodríguez Montero, F.; Guerra, C.; Trebitsch, M.; Han, S.; Beckmann, R.; Yi, S.; Lewis, J.; Jang, J., 2024, A&A, 687, A240 [ADS] [DOI] [arXiv] [HTML]
Cosmic evolution of black hole spin and galaxy orientations: Clues from the NewHorizon and Galactica simulations
Peirani, S.; Suto, Y.; Beckmann, R.; Volonteri, M.; Lin, Y.; Dubois, Y.; Yi, S.; Pichon, C.; Kraljic, K.; Park, M.; Devriendt, J.; Han, S.; Chen, W., 2024, A&A, 686, A233 [ADS] [DOI] [arXiv] [HTML]
On the Significance of the Thick Disks of Disk Galaxies
Yi, S.; Jang, J.; Devriendt, J.; Dubois, Y.; Han, S.; Kimm, T.; Kraljic, K.; Park, M.; Peirani, S.; Pichon, C.; Rhee, J., 2024, ApJS, 271, 1 [ADS] [DOI] [arXiv] [HTML]
Diffuse Light in Milky Way–like Haloes
Contini, E.; Han, S.; Jeon, S.; Rhee, J.; Yi, S., 2024, ApJL, 962, L10 [ADS] [DOI] [arXiv] [HTML]
The Connection between the Intracluster Light and its Host Halo: Formation Time and Contribution from Different Channels
Contini, E.; Rhee, J.; Han, S.; Jeon, S.; Yi, S., 2024, AJ, 167, 7 [ADS] [DOI] [arXiv] [HTML]
The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration
Contini, E.; Jeon, S.; Rhee, J.; Han, S.; Yi, S., 2023, ApJ, 958, 72 [ADS] [DOI] [arXiv] [HTML]
Star Formation History and Transition Epoch of Cluster Galaxies Based on the Horizon-AGN Simulation
Jeon, S.; Yi, S.; Dubois, Y.; Chung, A.; Devriendt, J.; Han, S.; Jackson, R.; Kimm, T.; Pichon, C.; Rhee, J., 2022, ApJ, 941, 5 [ADS] [DOI] [arXiv] [HTML]
YZiCS: On the Mass Segregation of Galaxies in Clusters
Kim, S.; Contini, E.; Choi, H.; Han, S.; Lee, J.; Oh, S.; Kang, X.; Yi, S., 2020, ApJ, 905, 12 [ADS] [DOI] [arXiv] [HTML]
YZiCS: Unveiling the Quenching History of Cluster Galaxies Using Phase-space Analysis
Rhee, J.; Smith, R.; Choi, H.; Contini, E.; Jung, S.; Han, S.; Yi, S., 2020, ApJS, 247, 45 [ADS] [DOI] [arXiv] [HTML]
Others
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Contact
san.han (at) iap.fr