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2023.11.14
The star formation, dust, and abundance of galaxies with CIB cross-correlations
<p>The cosmic infrared background (CIB) is the accumulated infrared radiation mainly generated from dust emissions in star-forming galaxies. It bears rich information about star formation history, dust thermodynamics, and galaxy abundance in the distant Universe. The CIB auto- and cross-correlations with other large-scale structure (LSS) tracers have been used to probe the star formation, dust, an...</p>
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2023.11.21
A two-phase model of galaxy formation: the growth of galaxies and supermassive black holes
<p>I will describe a model for galaxy formation and the growth of supermassive black holes (SMBHs), based on the fact that cold dark matter halos form their gravitational potential wells through a fast phase with rapid change in the potential, and that the high universal baryon fraction makes cooled gas in halos self-gravitating and turbulent before it can form rotation-supported disks. Gas fragme...</p>
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2023.11.17
Robust detection of the hot phase WHIM emission with eRASS
<p>The highly ionized warm/hot intergalactic medium (WHIM) permeating the vast space of the cosmic filaments is one of the least explored baryon contents in the local Universe. The properties of the WHIM in long cosmic filaments with lengths reaching up to 20-100Mpc, which account for >80% of the total filament volume and 50% of the baryonic mass, remain to be explored. In this work, we examine th...</p>
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2023.11.17
SRG/eROSITA Lockman Hole Survey: X-ray Sources Classification and Obscured AGN Candidates
<p>Lockman Hole field is an area in the sky with an extremely low column density of neutral hydrogen on the line of sight (Lockman et al., 1986). This outstanding characteristic turns Lockman Hole into a perfect window to observe extragalactic sources. The SRG/eROSITA space telescope conducted a deep X-ray survey in this area during the performance verification phase in 2019.My talk will be divide...</p>
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2023.11.21
High contrast imaging science with coronagraphic instruments
<p>While high-contrast imaging surveys in the past decade have produced only a handful of self-luminous exoplanets, they opened new gates for studying the forming environments of planetary systems. With multi-epoch and multi-wavelength imaging, I will talk about our ongoing efforts on scientific expeditions using current flagship observatories. They include (1) pinpointing the orbits of hidden pla...</p>
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2023.11.10
The binarity in massive star explosion -- A 12.4 day periodicity in a close binary system after a supernova
<p>Neutron stars and stellar-mass black holes are the remnants of massive star explosions. Most massive stars reside in close binary systems, but signatures for binarity or evidence for the formation of a compact object during a supernova explosion are still lacking. In this talk, I report the discovery of a stripped-envelope supernova, SN2022jli, which shows 12.4-day periodic undulations during...</p>
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2023.11.10
Exploring galaxy dark matter with dynamical models using combined stellar and HI kinematics
<p>The dynamical modelling technique is one of the major methods to measure the dark matter distribution in galaxies. Due to the degeneracy of baryonic and dark matter and the limitation of extended tracers in galaxies, accurate measurements of dark matter distribution in large sample of galaxies are still inadequate. We introduce our method to constrain the dark matter distribution in galaxies wi...</p>
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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>
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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>
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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'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>
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