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2023.04.20

The gas environment of galaxies across 10 billion years

<p>The evolution of galaxies is closely connected to the gas environment in which galaxies reside. Traditionally, this tenuous gas that cycles in and out of galaxies has been studied primarily in absorption using quasar spectroscopy. The deployment of large integral field spectrographs at 8 meter telescopes, and in particular MUSE at VLT, has transformed our view of the interplay between the ambie...</p>

2023.05.10

cosmological tests on fundamental physics

<p>The precision measurements from current observational cosmology have established the Lambda-Cold-Dark-Matter (LCDM) model as the standard cosmological model. However, the LCDM model as a pure phenomenological model with six base parameters still calls for a theoretical understanding of underlying mechanisms for the early and late accelerations as well as the nature of dark matter. In this talk,...</p>

2023.05.24

Toward Accurate Metallicity Measurements in ISM and Distribution of HI in CGM from 3D Spectroscopy

<p>Galaxies in the universe are intricately connected to the gas in and around galaxies. Accurately measuring the statistical properties of this gas is crucial for testing modern theories of galaxy formation and evolution. In this talk, I will present our recent efforts to characterize interstellar and circumgalactic media using integral field spectroscopy with high sensitivity in two aspects. 1) ...</p>

2023.04.21

Turbulence in outer protoplanetary disks

<p>Turbulence is essential to many fundamental processes in protoplanetary disks, including angular momentum transport, dust evolution, and planet migration. I will focus on two instabilities that can drive turbulent motions in outer disks. In the first part of this talk, a series of global 3D non-ideal MHD simulations via Athena++ code will be presented. The outer disk is found to be weakly MRI t...</p>

2023.04.13

Coronal magnetic field Measurements

<p>Coronal magnetic fields are at the heart of most of the unsolved problems in solar physics and of the solar–terrestrial relationship. However, no routine measurements have been carried out for the magnetic field measurement in the solar corona, due to the weakness of its signature. In the past several decades, a number of techniques have been developed for coronal magnetic field diagnostics. I...</p>

2023.03.31

Supercritical growth of seed BHs at cosmic dawn and co-evolution with host galaxies: a perspective regarding outflows

<p>Supercritical growth of massive/stellar mass seed BHs at high-z universe is believed to be one of the possible solutions to grow the observed supermassive black holes (SMBHs) at z~6. We study the long-term evolution of the global structure of axisymmetric accretion flows onto a black hole (BH) at rates substantially higher than the Eddington value, performing two-dimensional radiation hydrodyna...</p>

2023.04.06

Solving the Mystery of Small Exoplanets through Holistic Characterization

<p>The first detection of another planet around a Sun-like star marked the beginning of a new era in which our understanding of how planets typically form and the uniqueness of our Solar System were radically upended. We now know that planet formation is incredibly resilient, and produces a diverse myriad of planets around a wide range of stellar types. These remarkable findings tell us that the S...</p>

2023.03.24

Models for binary-neutron-star mergers in the multi-messenger era

<p>It has been more than half a decade since the first joint detection of gravitational wave and its electromagnetic counterparts (GW170817). The physical models on binary-neutron-star (BNS) mergers are continuously challenged by the ongoing observational facts and the progress in simulation. I will be briefly reviewing the history of models for BNS mergers and presenting the efforts we have made ...</p>

2023.03.17

Changing-look AGNs in the Dark Energy Spectroscopic Instrument (DESI)

<p>Changing-look (CL) phenomenon can be generally confirmed by the emergence or disappearance of Broad Emission Line, which challenge the understanding of AGN unification paradigm and accretion disk model. Dark Energy Spectroscopic Instrument (DESI) provides a unique opportunity to systematical study CL-AGNs, which enable us to investigate it by cross-matching the spectra of DESI early data and SD...</p>

2023.03.30

Not only astrophysics: fundamental physics studies with high energy missions

<p>There are no doubts that high energy astrophysics has opened new views on the Universe and on the many classes of sources that populates the hot and energetic sky. However, in the near future, spectral, timing, and polarimetric observations at high energies are expected to address key scientific questions in fundamental physics.In this seminar, I will first briefly summarise the potential of hi...</p>