Research
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2023.05.23
Binaries of the first stars as progenitors of compact object mergers
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...
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2023.05.24
Toward Accurate Metallicity Measurements in ISM and Distribution of HI in CGM from 3D Spectroscopy
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) ...
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2023.05.25
Identification of exotic binaries in globular clusters
I will present my work on identifying faint X-ray sources in multiple Galactic globular clusters (GCs). These X-ray sources could be close binaries hosting compact stellar remnants (white dwarfs, black holes, and neutron stars) and magnetically active binaries. For some GCs, we incorporate deep radio imaging data in our analyses to reveal potential candidates of millisecond pulsars and accretin...
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2023.06.09
Radiation MagnetoHydrodynamic Simulations of Astrophysical Systems: from massive stars to black holes
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 ...
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2023.06.13
Modeling realistic HII regions: Constraints from multidimensional nebular diagnostics
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 ...
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