科学研究
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2023.07.04
GASTRO library: studying substructures of the Milky Way stellar halo with SPH + N-body single merger models
The Milky Way experienced several merger events which left their imprints on the stellar halo. In particular, it is known that a major merger happened during the Galaxy’s first Gyrs and, likely, perturbed its disc-shape structure. In order to fully understand the effects of such an event, we need to know the chemical and dynamical characteristics of the young Milky Way, i.e. before the major m...
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2023.07.04
JWST/NIRCam Wide-Field Slitless Spectroscopy: Current Status and Prospects as a Powerful Redshift Machine
I will present an overview of the JWST NIRCam wide-field slitless spectroscopy (WFSS). This observing mode is highly efficient in spectroscopically confirming galaxies in the Epoch of Reionization through rest-frame optical emission lines (e.g., [OIII] and Hα). With NIRCam WFSS, galaxies at z>6 can be easily detected and confirmed with ~10-min integration. The following studies will be highlig...
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2023.07.03
Deconstruction of galaxies: bulges, disks, and stellar halos --- insights from the IllustrisTNG Simulations
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...
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2023.07.03
Modelling the formation and evolution of galaxies through semi-analytic spectral fitting
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...
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2023.07.03
Structural evolution of galaxies since cosmic noon
In this talk I will discuss the geometry, structure and morphological transformation of star-forming and quiescent galaxies from the peak of cosmic star formation to the present day. Resolved observations from multiple wavelengths and tracers enable us to reconstruct where stars form within galaxies and how stellar distributions are assembled, while simultaneously revealing insights into the e...
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