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2023.11.13

Understanding the galaxy formation and metal-enrichment in the view of gas-regulator framework

<p>Star-forming galaxies are actively accreting gas from surrounding materials during the cosmic time, while the feedback from star formation on the other hand blows the gas away as well as enriches the inter-stellar/-galactic medium. The interplay between inflow, outflow and star formation is then the key to understand the formation and evolution of star-forming galaxies, as well as the relevant...</p>

2023.11.03

Unprecedented insights into the formation and evolution of the Galactic disk.

<p>The Galactic disk contains a substantial fraction of the baryonic matter angular momentum and at least two main stellar populations. Therefore, the formation and evolution of the Galactic disk is essential for understanding how our Galaxy was formed and evolved. We used accurate photometric metallicity estimates and Gaia Early Data Release 3 astrometries and two independent techniques (velocity...</p>

2023.10.31

Surveying galaxy clusters in the X-ray Universe: New results from eROSITA

<p>The eROSITA X-ray telescope has performed four X-ray all-sky surveys since its launch in July 2019. In this talk, I will briefly overview eROSITA&#39;s early results on galaxy clusters, with an emphasis on the eFEDS PV-phase program. I will also report the latest progress on clusters and superclusters from the first eROSITA All-Sky Survey.BIODr. Ang Liu is a postdoc researcher at Max Planck Institu...</p>

2023.10.30

Cluster Intrinsic Alignment in DES Y1

<p>Clusters of galaxies trace the most non-linear peaks in the cosmic density field. The weak gravitational lensing of background galaxies by clusters can allow us to infer their masses. However, galaxies associated with the local environment of the cluster can also be intrinsically aligned due to the local tidal gradient, contaminating any cosmology derived from the lensing signal. In this talk, ...</p>

2023.10.27

First-year JWST results of high-redshift moderate-luminosity AGN

<p>I present the latest results from a JWST Cycle 1 GO program, in which 12 of the lowest-luminosity z&gt;6 quasars selected from the deep Subaru/HSC survey are observed with NIRCam imaging and NIRSpec Fixed-Slit spectroscopy. We have successfully detected stellar light of quasar host galaxies in NIRCam F150W and F356W images, which straddle the redshifted 4000 angstrom break. A self-developed image ...</p>

2023.10.24

Optimization of Cosmological Information Extraction with Minkowski Functionals

<p>Galaxy survey provides an important window for the exploration of fundamental physics by accurately mapping the large-scale structure of the Universe (LSS), which is expected to lead to great scientific discoveries. In cosmology, LSS encodes abundant key cosmological information (e.g., baryon acoustic oscillations, neutrino masses, primordial non-Gaussianities, gravity properties, and cosmologi...</p>

2023.10.26

Exploring the early Milky Way with metal-poor stars

<p>Old low-metallicity (“metal-poor”) stars provide us a unique window to explore the early evolution and formation of our Milky Way as well as the early nucleosynthesis in the universe. In this talk, I would like to introduce the art of Galactic archaeology with metal-poor stars, mainly using the joint efforts between LAMOST and Subaru in the past few years as an example. A homogeneous high-pre...</p>

2023.10.24

An Overview of Stellar Evolution and Pollution in AGN Disk (SEPAD) and their Implication on the Stellar Dynamics in the Galactic Center and around other Supermassive Black Holes

<p>Extended regions of accretion disks around supermassive black holes in bright AGNs are prone to gravitational instability, star formation and stellar dynamical evolution with feedback to the disks&#39; structure. Spectroscopic data provide vital clues on the stellar and residual black hole populations. Their dynamical interaction with each other, their natal disks, and other massive companions in a...</p>

2023.10.20

TRANSforM: stellar parameters estimated from LAMOST DR10 M dwarfs

<p>The accurate determination of stellar parameters in M-type stars holds significant importance in various astronomical studies. In our study, we employed a transfer learning method coupled with PHOENIX synthetic spectra to estimate fundamental atmospheric parameters (Teff, log g, [M/H], [α/M]) and radial velocities (RV) for an extensive dataset encompassing 581,778 M dwarfs obtained from the Lo...</p>

2023.10.17

existing tensions in ΛCDM model

<p>The concordance or standard Λ Cold Dark Matter (ΛCDM) model is a well-defined, predictive and simple cosmological model. A number of challenges of the standard ΛCDM model have been emerging during the past few years, which has been summarized by recent reviews.In this talk, I will give a brief introduction to several existing signals in cosmological and astrophysical data that appear to be i...</p>