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Unveiling the inner structure of galaxy clusters with the combination of multiple probes

Sep 14 – 18, 2026
SJTU Xuhui Campus, Withub Building (慧谷科技楼）
Asia/Shanghai timezone

Contribution List

22 out of 22 displayed
  1. 16. Galaxy evolution in clusters: review
    Benedetta Vulcani
    9/14/26, 10:30 AM
  2. 18. Cluster strong lensing: review
    Claudio Grillo
    9/14/26, 11:00 AM
  3. 19. Cluster weak lensing: review
    Raphael Gavazzi
    9/14/26, 11:30 AM
  4. 17. Cluster galaxy dynamics: review
    Michele Pizzardo
    9/14/26, 1:30 PM
  5. 9. Simulating and Modelling the strong lensing cluster in the Era of CSST
    Li Ran
    9/15/26, 9:30 AM

    The China Space Station Telescope (CSST) is China's next-generation space observatory currently under development. Featuring a 2-meter primary mirror, CSST is expected to detect hundreds of strong gravitational lensing galaxy clusters during its wide-field survey, providing a powerful probe for dark matter research. In preparation for CSST's cluster strong-lensing science goals, we have...

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  6. 20. Substructure in strong lensing and simulated clusters
    Massimo Meneghetti
    9/15/26, 10:00 AM
  7. 4. Simulation-Based Inference for Strong Lensing Clusters
    Shijiao Yin
    9/15/26, 11:00 AM

    We present an automated, pixelated parameter-inference framework for strong lensing galaxy clusters based on simulation-based inference (SBI).

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  8. 13. Hierarchical Strong Lensing Modeling: Application to MACS J1206.2−0847
    Li Cui (Shanghai Jiaotong University)
    9/15/26, 11:30 AM

    Galaxy–galaxy strong lensing (GGSL) in galaxy clusters provides a unique probe of the mass distributions of individual cluster member galaxies. However, its definition and identification can depend sensitively on the assumed properties of these galaxies. We systematically investigate how the commonly adopted GGSL criterion responds to variations in the truncation radius and velocity dispersion...

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  9. 11. Pixelated Reconstruction of the Carousel Lens: From Image Positions to Multiple Extended Sources
    XiangHao Ma
    9/15/26, 1:30 PM

    Strong-lensing models of galaxy clusters are traditionally constrained by the positions of multiply imaged sources, leaving much of the information encoded in the resolved surface brightness of extended arcs unused. This talk presents a JAX-based modelling framework that combines multiple-image constraints with pixelated source reconstruction and GPU-accelerated Bayesian inference. Three...

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  10. 8. Gravitational Shear and Flexion in Abell 2744
    jiarui sun
    9/16/26, 9:30 AM

    As the lensing signal increases near massive foreground clusters, higher-order effects become increasingly important, requiring an accurate treatment of the lens equation beyond the first-order approximation. While conventional galaxy shape estimators have been extensively studied in the perturbative regime of weak lensing, recovering large shear signals and higher-order distortions under...

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  11. 21. Extending Cluster Lensing Mass Inversion (Λ-CLUMI+): Combining Dynamics and Lensing for Accurate Galaxy Cluster Mass Reconstruction in the Infall Region
    Michele Pizzardo
    9/16/26, 10:00 AM

    Abstract.

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  12. 22. Kinematic Weak Lensing 1
    Ned Taylor
    9/16/26, 11:00 AM
  13. 23. Kinematic Weak lensing 2
    Jiachuan Xu
    9/16/26, 11:30 AM
  14. 10. The internal and external structure of clusters in the Hector Galaxy Survey
    Matt Owers
    9/16/26, 1:30 PM

    I will present a dynamical overview of the Hector Galaxy Survey clusters, based on mixture models that incorporate full dynamical modelling. This approach yields simultaneous masses for the main clusters and their subclusters, and assigns each galaxy a membership probability for every structure.

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  15. 3. Unveiling Faint Photometric Satellites in Galaxy Groups and Clusters
    Wenting Wang (SJTU)
    9/17/26, 9:30 AM

    I will present our measurements of faint photometric satellite luminosity and stellar mass functions in galaxy groups/clusters through a cross-correlation technique. The measurement can reach -7 in r-band absolute magnitude or 10^5.5 msun in the latest DESI data, which has a low-mass end slope consistent with CDM predictions. We will also show that MW satellite LF function is typical in the...

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  16. 15. Past and Present of Cluster Halo Assembly: the Central Galaxy’s Stellar Profile and its Satellite Population
    Shuo Xu (Department of Astronomy, Tsinghua University)
    9/17/26, 10:00 AM

    Deep wide-field imaging (e.g., HSC, Euclid) now reveals the low-surface-brightness outskirts of massive central galaxies and intra-cluster light, while cluster spectroscopic surveys (e.g., JUST) can better probe their satellite populations. Together, these two stellar components preserve complementary records of the host halo’s assembly history.  Using a halo-mass-complete sample of massive...

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  17. 14. The Initial Mass Function and Stellar Populations in Massive Early-Type Galaxies
    Meng Gu (Tsinghua University)
    9/17/26, 11:00 AM

    Understanding how galaxies form and assemble is one of the central goals of astrophysics. By extracting detailed elemental abundance patterns and constraining the stellar initial mass function (IMF) from the integrated light of distant galaxies, we gain new insights into their star formation histories, stellar mass distributions, and dark matter content. In this talk, I will present results...

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  18. 5. Probing the Mass Distribution of M87 with Multiple Discrete Tracers
    Qimin Zhang
    9/17/26, 11:30 AM

    We present a dynamical study of M87 using globular clusters (GCs) and ultra-compact dwarfs (UCDs) as discrete kinematic tracers. We construct separate axisymmetric Jeans anisotropic models (JAM) for different tracer populations, including blue GCs, red GCs, and UCDs. For each tracer population, we derive the enclosed mass at its characteristic radius and compare the independent mass...

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  19. 6. Forward modeling galaxy infall kinematics around clusters
    Yunzhe Gu (Shanghai Jiao Tong University)
    9/17/26, 1:30 PM

    Galaxy infall kinematics (GIK) around clusters provide a valuable probe of dynamical mass profiles, particularly the characteristic infall velocity. Building on Zu & Weinberg (2013), we propose an improved forward modeling methodology for the redshift-space distortions of galaxies around central clusters. Specifically, we will calibrate a parametric GIK model using the FLAMINGO simulation. By...

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  20. 12. The depletion radius of DM halos traced by luminous objects in TNG300
    Mingtao Yang
    9/17/26, 2:00 PM

    Please schedule my talk during the first few days if that is possible. Thanks!

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  21. 2. Direct Measurement of Galaxy Assembly Bias from Galaxy-Cluster Cross-correlations
    Zhiwei Shao (Shanghai Jiao Tong University)
    9/18/26, 9:30 AM

    Understanding galaxy assembly bias is crucial for deriving unbiased cosmological constraints from Stage
    IV surveys such as the Dark Energy Spectroscopic Instrument (DESI). Taking advantage of the state-of-the-art
    DESI group catalog, we develop a robust method to directly measure galaxy assembly bias, parametrized by
    $Q_{\rm env}$, for a volume-limited galaxy sample at redshift...

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  22. 7. First Observational Evidence for Split Infall Flow of Cosmic Filaments into Clusters
    Ji Yao (Shanghai Astronomical Observatory)
    9/18/26, 10:00 AM

    Velocity fields in the cosmic web are fundamental to structure formation but remain difficult to observe directly beyond the linear regime. Here we present observational evidence that galaxy filaments connecting pairs of galaxy clusters undergo a split infall, with opposite velocity flows toward the two clusters. Using spectroscopic galaxies from the Sloan Digital Sky Survey, we isolate the...

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