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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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2023.06.28
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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2023.06.09
Radiation MagnetoHydrodynamic Simulations of Astrophysical Systems: from massive stars to black holes
<p>Evolutions of stars, black hole accretion as well as interactions between stars and black holes play an important role in various astrophysical systems, such as supernova, X-ray binaries, AGNs as well as various transient phenomena. I will discuss some long standing issues related to massive star and black hole systems. Then I will describe some examples on how we can make progress on some of ...</p>
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2023.05.23
Binaries of the first stars as progenitors of compact object mergers
<p>A grand challenge for modern astrophysics is to understand star and galaxy formation in the first billion years of cosmic history. In particular, the first generation of stars born in extremely metal-poor/free primordial gas, the so-called population III (Pop III), are believed to have distinct features compared with present-day stars: They are more likely to become massive black holes due thei...</p>
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2023.04.26
21cm Cosmology in the Post-Reionization Universe
<p>I will discuss some recent progress in 21cm line intensity mapping within the SKA cosmology science working group. In particular, we report the first direct detection of the cosmological power spectrum using 21cm line (2301.11943), derived from interferometric observations with the L-band receivers of the MeerKAT radio telescope. I review the challenges in analysing the MeerKAT data and present...</p>
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2023.04.25
Unveiling BCGs and their host clusters using the ICL and Satellite Galaxy Populations
<p>At the heart of every galaxy cluster is the brightest central galaxy (BCG). The central location of the BCG along with its unique formation history yield the underlying galaxy-dark matter halo connection. This statistical correlation allows us to enhance our understanding of the assembly and evolution of BCGs over cosmic time. However, we gain further insight into the formation and evolution of...</p>
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2023.04.19
Galaxy-Scale Strong Gravitational Lensing at High Angular Resolution
<p>Anomalous flux ratios between lensed images can provide a key test of the dark matter sub-halo population, and hence the nature of dark matter. However, the observed anomalous flux ratios at radio frequencies can also be the result of systematics associated with our lack of knowledge about the source structure, source variability, propagation effects and microlensing of compact objects within t...</p>
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2023.04.11
X-ray reflection spectroscopy on black hole X-ray binaries
<p>Black hole X-ray binaries are bright accreting systems that can undergo apparent state changes on the reasonable timescales for human. These systems are good analogy to their supermassive counterparts: active galactic nuclei. X-ray reflection spectroscopy is a powerful tool to study the accretion geometry under different regimes. In this talk, I will present how we use X-ray reflection spectros...</p>
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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>
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