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2024.05.14
Gravitational radiation from oscillations of ultracompact stars
<p>By analytically solving the Teukolsky gravitational wave equation for the spacetime of an ultracompact star of constant density, we derive exact and simple formulae that completely describe weakly damped oscillations trapped inside such stars. No similar complete analytic solution was known before, despite several attempts to find it. Our solution is cast in terms of the quasi normal modes of o...</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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2023.06.12
The Power of Milky Way's Stellar Streams Enabled by Multi-Object Spectroscopic Surveys
<p>In this talk, I will discuss two ongoing spectroscopic programs to study the stellar streams in our Milky Way and highlight a few latest scientific results from these two programs. The Southern Stellar Stream Spectroscopic Survey (S5), started in 2018, is the first systematic program pursuing a complete census of known streams in the Southern Hemisphere. The science results from S5 include a ho...</p>
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2023.05.10
A dynamical model and structure decomposition of barred galaxies
<p>Galaxy structures are fossil records of their assembly history. Modern IFU spectrographs offer the ability to map the spatial distribution of the motions, ages, and chemical abundances of stars in galaxies, which provide unprecedented detailed view of galaxies structures. But the information are still blended along the line-of-sight. Decomposition of galactic structures in a physical way is cha...</p>
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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>
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2023.05.17
脉冲星自转减慢和高速中子星：中子超流涡旋体的中微子辐射及其效应
<p>1)首先介绍近年来脉冲星观测的(P-Pdot)图同国际流行的脉冲星自转减慢的磁偶极辐射理论(标准模型)预言的明显矛盾。其次介绍1982年我们提出的中子超流涡旋体的中微子辐射理论模型。2) 在1982年我们的理论基础上,我们提出了这五十年来天文观测发现的高速中子星的物理起源于我们的 “中子超流涡旋体的中微子辐射喷流模型”。Host: Tipei L</p>
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2020.12.17
Towards Precision Astrophysics for Warm Ionized Gas
The interstellar medium is the fuel for star formation and AGN, and the sink for their feedback energy. It also records the history of star formation in its elemental abundances. The warm ionized gas ...
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