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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>

2023.03.10

Strong magnetic field impact on the neutrino process inside the SNe explosion

<p>Strong magnetic fields such as MHD-Jet SNe could exist in the inner region of the explosive astrophysical site. The phase space of the electrons is quantized inside the magnetic field so that the weak interaction rates deviate from the field-free case. This talk focuses on the (anti)neutrinos absorption process. This process is essential since it determines the opacity of the neutrino and the p...</p>

2023.03.23

Active Galactic Nuclei: Monsters to Scale or Puzzles to Solve?

<p>Active Galactic Nuclei (AGNs) are the brightest sources of electromagnetic radiation in the&nbsp;universe, enabling us to observe them across the cosmos. AGNs are the central parts of galaxies.Most of their brightness results from the accretion of matter by a supermassive black hole&nbsp;(SMBH) at their center. Studying the AGNs informs us about the role of SMBHs in the&nbsp;formation and evolution of galaxie...</p>