Research
-
2023.06.28
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...
More -
2023.06.19
Deep Learning the Local Group
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...
More -
2023.06.09
Cold molecular gas (cloud) properties across different types of galaxies
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 ...
More -
2023.06.02
The DESI Damped Lyα System Survey: Data Release 1
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...
More -
2023.05.26
Galaxy/Quasar-Dark-Matter-Halo Connection of DESI: A Generalized Subhalo Abundance Matching Approach for Multiple Tracers
LCDM is the standard model of modern cosmology with two dark components, dark matter and dark energy. The nature of dark energy and the dark matter structure growth rate can be probed via the large-scale structure (LSS). For this purpose, we observe millions of spectra of galaxies and quasars (QSOs) with spectroscopic galaxy surveys to explore the 3D map of the Universe. Meanwhile, high-resolut...
More