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2023.11.27

Multi-Messenger Probes on Dark Matter Beyond WIMPs

<p>We will discuss two promising dark matter scenarios: axion-like particle dark matter and primordial black hole dark matter. We begin with radio telescope probes on axion-like dark matter. We will discuss the axion-photon conversion around neutron stars which results in the radio emission and the 21 cm probes through the effects on large scale structure formation suppression. We then turn our at...</p>

2023.11.24

Tidal Disruption Events: Probes of Accretion Physics and Black Hole Demographics

<p>Tidal disruption events (TDEs) provide unique laboratories to&nbsp;study the demographics, immediate stellar and gaseous environments, and&nbsp;accretion physics of the massive black hole population. Over the past&nbsp;few years, time domain sky surveys such as the optical Zwicky Transient&nbsp;Facility (ZTF) have led to a surge of TDE discoveries in galaxy centers.&nbsp;This talk highlights our efforts to constrain th...</p>

2023.11.21

High contrast imaging science with coronagraphic instruments

<p>While high-contrast imaging surveys in the past decade have produced only a handful of self-luminous exoplanets, they opened new gates for studying the forming environments of planetary systems. With multi-epoch and multi-wavelength imaging, I will talk about our ongoing efforts on scientific expeditions using current flagship observatories. They include (1) pinpointing the orbits of hidden pla...</p>

2023.11.10

Exploring galaxy dark matter with dynamical models using combined stellar and HI kinematics

<p>The dynamical modelling technique is one of the major methods to measure the dark matter distribution in galaxies. Due to the degeneracy of baryonic and dark matter and the limitation of extended tracers in galaxies, accurate measurements of dark matter distribution in large sample of galaxies are still inadequate. We introduce our method to constrain the dark matter distribution in galaxies wi...</p>

2023.11.13

Understanding the galaxy formation and metal-enrichment in the view of gas-regulator framework

<p>Star-forming galaxies are actively accreting gas from surrounding materials during the cosmic time, while the feedback from star formation on the other hand blows the gas away as well as enriches the inter-stellar/-galactic medium. The interplay between inflow, outflow and star formation is then the key to understand the formation and evolution of star-forming galaxies, as well as the relevant...</p>

2023.10.24

An Overview of Stellar Evolution and Pollution in AGN Disk (SEPAD) and their Implication on the Stellar Dynamics in the Galactic Center and around other Supermassive Black Holes

<p>Extended regions of accretion disks around supermassive black holes in bright AGNs are prone to gravitational instability, star formation and stellar dynamical evolution with feedback to the disks&#39; structure. Spectroscopic data provide vital clues on the stellar and residual black hole populations. Their dynamical interaction with each other, their natal disks, and other massive companions in a...</p>

2023.09.11

Stellar Object Formation and Evolution in AGN Disks

<p>Study of stellar objects embedded in AGN accretion disks around massive Black Holes have been motivated by i) the disk of stars that formed in-situ in the galactic center; ii) the redshift independence of metallicity in AGN disks, which also suggest in-situ pollution; iii) massive LIGO-Virgo gravitational wave sources that possibly evolved in a gas rich environment, and iv) quasi-periodic erupt...</p>

2023.09.07

Probing Galaxy Formation in the Cosmic Web at z~3: A View with the James Webb Space Telescope

<p>Galaxies are not isolated islands in the Universe. Across the cosmic time, they assemble and evolve while frequently interacting with the ambient cosmic gas, namely the circum- and inter-galactic media (CGM/IGM), which belongs to the large-scale structure named the cosmic web. However, specifically what roles this large-scale environment plays in galaxy formation remains as a key open question ...</p>

2023.09.08

Eruptive YSOs in the large-survey era

<p>The Pre-Main-Sequence stellar evolution is shaped by the mass accretion process, which is known for its highly unstable nature. In fact, most of the stellar mass is gathered during &quot;episodic accretion&quot; bursts, which solved the luminosity spread of young clusters. As a consequence of the accretion bursts, eruptive behaviours have been observed on Young Stellar Objects (YSO), such as the decades-...</p>

2023.09.15

AGN Feedback in Dwarfs and Giants Near and Far

<p>AGN feedback is a critical component in modern simulations of galaxy evolution. In dwarf galaxies, both observational and theoretical evidence of AGN feedback are accumulating, shedding new light on the evolution of dwarf galaxies. In massive galaxies, luminous quasars likely drive the most energetic outflows, making them the best laboratories to examine quasar feedback closely across cosmic ti...</p>