Research
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2023.11.03
Unprecedented insights into the formation and evolution of the Galactic disk.
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...
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2023.11.02
Feeding and Feedback of Low-luminosity AGNs
Supermassive black holes (SMBHs) spend most of their lifetime accreting at a rate well below the Eddington limit, manifesting themselves as low-luminosity active galactic nuclei (LLAGNs). The prevalence of a hot wind from LLAGNs is a generic prediction by theories and numerical simulations of black hole accretion and has recently become a crucial ingredient of AGN kinetic feedback in cosmologic...
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2023.10.31
Surveying galaxy clusters in the X-ray Universe: New results from eROSITA
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'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...
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2023.10.30
Cluster Intrinsic Alignment in DES Y1
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, ...
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2023.10.27
First-year JWST results of high-redshift moderate-luminosity AGN
I present the latest results from a JWST Cycle 1 GO program, in which 12 of the lowest-luminosity z>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 ...
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