Research
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2023.11.10
SRG/eROSITA Lockman Hole Survey: X-ray Sources Classification and Obscured AGN Candidates
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...
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2023.11.06
The binarity in massive star explosion -- A 12.4 day periodicity in a close binary system after a supernova
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...
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2023.10.31
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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2023.10.23
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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2023.10.18
TRANSforM: stellar parameters estimated from LAMOST DR10 M dwarfs
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...
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