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2026.05.21

Yongquan Xue's talk

Host: Junjie Ma

2026.05.14

AGN Feedback Across Scales using MACER: From Cooling Flows to X-ray Profiles

AGN feedback is widely invoked to regulate hot gas in galaxies and clusters, yet most existing models remain phenomenological and lack predictive power. I will present results from the MACER framework, a physically grounded model that self-consistently links black hole accretion to radiative and mechanical feedback. Across both cluster and galactic scales, MACER achieves predictive, parameter-f...

2026.05.07

Searching for Wandering Worlds -- Discovering Isolated Black Holes and Free-Floating Planets with Microlensing

Galactic microlensing is the only known method for detecting dark objects ranging from isolated stellar-mass black holes (BHs) to low-mass free-floating planets (FFPs). Our success in the interferometric resolution of microlensed images with the VLTI has opened a new avenue for identifying isolated stellar remnants. I will discuss how VLTI-GRAVITY+ can potentially discover a large sample of BHs...

2026.04.23

Closeby Habitable Exoplanet Survey (CHES): An Astrometry Mission to Explore Nearby Habitable Worlds

The detection and study of potentially habitable exoplanets is a cutting-edge topic in contemporary astronomy. The National Medium- and Long-Term Development Plan for Space Science (2024–2050) has been officially released, identifying “Nearby Habitable Exoplanets” as one of its key scientific frontiers. The Closeby Habitable Exoplanet Survey (CHES) (http://www.ps.pmo.cas.cn/CHES/)) aims to s...

2026.04.16

Atoms, Grains, Infinity: Consistent update the understandings of dust grain physics in diffuse matter astrophysics

Dust grains are fundamental constituents of diffuse matter throughout the universe, mediating key processes from interstellar chemistry to planet formation. Yet their microscopic behaviors, presumably governed by interactions at surfaces, has traditionally been treated through empirical and semi-quantitative prescriptions in most astrophysical models. In this report, we present a series of bott...

2026.04.09

Evolution of Globular Cluster Systems from High Redshift to the Present

Globular clusters are massive star clusters that formed in high-redshift galaxies and remained gravitationally bound until the present. They serve as tracers of most active episodes of galactic star formation and allow us to reconstruct the assembly history of the Milky Way and nearby galaxies. I will describe a long-term program to model the formation and disruption of globular clusters throug...

2026.04.02

一颗持续活跃的快速射电暴 A Persistently Active Repeating Fast Radio Burst

Fast Radio Bursts (FRBs) are millisecond-duration, high-energy radio transients of unknown origin, whose large dispersion measures indicate extragalactic, and possibly cosmological, distances. With the rapid advancement of radio telescope capabilities, the number of detected FRBs has increased dramatically, greatly advancing studies of their physical origins and cosmological applications. Howev...

2026.03.26

Gas cycling processes in nearby galaxies

Galaxies evolve via internal and external processes. Kinematically misaligned galaxies, primarily stemming from external gas acquisition, are ideal probes of this process. From final data release of MaNGA, we selected ~700 misaligned galaxies (gas-gas, gas-star, star-star) and systematically investigated their origin and physical properties. Key findings: (1) Misaligned gas, often perpendicular...

2026.03.19

Resolving small-scale dynamics of supermassive black holes in galaxy formation simulations

Supermassive black hole (SMBH) binaries, formed during galaxy mergers, are the primary targets for low-frequency gravitational wave (GW) observatories. Understanding the coalescence process of SMBH binaries in a cosmological galaxy formation context is crucial for accurate GW predictions. However, this has been a long-standing challenge: traditional galaxy formation simulations lack the force r...

2026.03.10

Cosmic Dance: Angular Momentum Transfer from Large-scale to Small-scale

Angular momentum is a key quantity linking the formation of galaxies to the dynamics of the cosmic web. Building on a series of recent observational and theoretical works, this talk will present a picture of how angular momentum is generated, transported and reprocessedacross scales—from megaparsec-scale filaments, through galaxy clusters, down to individual galaxies. I will first show how lar...