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2023.07.03
Modelling the formation and evolution of galaxies through semi-analytic spectral fitting
<p>Obtaining physical information from the integral spectra of unresolved stellar populations is the key to investigating a galaxy's evolution, during which modelling the levels of heavy elements within the galaxy over time is fundamental but often missed. While most studies of chemical evolution tend to focus on gas and stellar metallicities separately, these quantities can – and should – be tr...</p>
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2023.06.29
Adaptive Optics Facility and MUSE at the VLT-UT4
<p>In this talk, I will present the Adaptive Optics Facility (AOF) and the MUSE instrument at VLT/UT4. AOF is the new generation cutting-edge adaptive optics system for the instruments at UT4. With the high-performance deformable secondary mirror and 4 laser guide stars system, AOF enables to correct atmospheric turbulence effects on the optical wavelength, facilitating the Multi-Unit Spectrosco...</p>
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2023.07.03
Deconstruction of galaxies: bulges, disks, and stellar halos --- insights from the IllustrisTNG Simulations
<p>In this project, we aim to understand structures in galaxies from a deconstructive perspective. In a series of papers, we have developed an accurate, efficient, and unsupervised way that extracts structures of simulated galaxies in kinematics. We successfully identify kinematically-derived bulge, disk, and halo structures that have clear physical formation mechanisms in the IllustrisTNG simulat...</p>
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2023.06.19
Deep Learning the Local Group
<p>As the witnesses of the early Universe, dwarf galaxies, especially the low-mass ones (total mass ≤ 10^9 M⊙), carry the imprint of essential physical processes, from the formation of the first stars to the formation of the first galaxies, which shaped the universe into the one we observe today. I will show the power of searching dwarf galaxy debris in the low-metallicity Milky Way, and how the...</p>
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2023.06.29
Exploring the Universe with Space Transition-edge Sensor: from Cosmic Microwave to X-ray Background
<p>One commonly accepted idea for the origin of the large-scale structure in the Universe is that the minute quantum fluctuations were stretched to macroscopic scales as a consequence of nearly exponential expansion of spacetime during the “cosmic inflation”. Cosmic inflation predicts primordial density fluctuations that are consistent with the observed CMB temperature fluctuations. It also pred...</p>
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2023.06.28
Kamioka CryoLab: A Future Low-background Underground Facility for Cryogenic Light Dark Matter Searches
<p>Dark matter — established via various cosmological and astronomical observations — is a significant constituent of our Universe and remains one of the most outstanding mysteries of modern physics. The mass range of potential dark matter candidates covers more than 30 orders of magnitude. In the past, researchers have primarily focused on searching for GeV-TeV dark matter (WIMP) via nuclear re...</p>
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2023.06.12
Cold molecular gas (cloud) properties across different types of galaxies
<p>As fuel feeding supermassive black hole and star formation, cold molecular gas is the key to many fundamental processes in galaxy evolution. In the last decade and especially with the advent of Atacama Large Millimeter/submillimeter Array (ALMA), it has become feasible to spatially resolve giant molecular clouds (GMCs) in a large number and a wide variety of galaxies. Here, I summarise my work ...</p>
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2023.06.28
Breaking bad degeneracies with Love relations: Improving gravitational-wave measurements through universal relations
<p>The distance-inclination degeneracy limits gravitational-wave parameter estimation of compact binary mergers. Such a degeneracy can be partially broken by including higher-order modes or precession when modeling the waveform of a binary that contains a black hole. But what about binary neutron stars, for which these effects are suppressed? In this talk, I will introduce a new parameterization o...</p>
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2023.06.13
Modeling realistic HII regions: Constraints from multidimensional nebular diagnostics
<p>As an important tracer of star formations and chemical enrichment in galaxies, HII regions play a fundamental role in our understanding of galaxy evolution. To infer the physical conditions of HII regions in galaxies, many diagnostic methods based on the emission-line spectra of the ionized gas have been proposed. Meanwhile, people have constructed theoretical models to describe the ionization ...</p>
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2023.06.05
The DESI Damped Lyα System Survey: Data Release 1
<p>We present the results of a Damped Lyman α (DLA) system survey in the Dark Energy Spectroscopic Instrument (DESI) Survey Data release 1. The concordance DLA catalog combines the prediction from two fully automated techniques: the convolutional neural network (CNN) model and the Gaussian Process (GP) model. For each absorber, we obtain an accurate measurement of the redshift, the HI column dens...</p>
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