科学研究
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2022.12.27
Universe seen through weak gravitational lensing
We are facing an exciting era of discovering the nature of dark matter and dark energy with upcoming large-scale surveys, such as Chinese Survey Space Telescope (CSST), Rubin, and Euclid. One of the major analysis methods of the surveys, weak lensing (WL), uses the shape distortion of background sources for detecting the foreground matter distribution. It is a powerful method for studying dark ...
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2022.12.27
Observational signatures of compact objects in active galactic nuclei
The origin of stellar-mass black hole mergers discovered through gravitational waves is being widely debated. Mergers in the disks of active galactic nuclei (AGN) represent a promising source of origin. By modelling the evolution of compact objects in AGN disks, we found that several observational signatures in gravitational wave data are only explained by the AGN channel. Beyond gravitational ...
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2022.12.22
Towards kHz Gravitational Wave Astronomy
Gravitational wave has become a new window to explore our universe. Among many events detected so far, GW170817 was the first binary neutron star gravitational wave event joint with electromagnetic observations, which revolutionized our understanding of neutron star physics and the origin of kilonova. However, due to a limited detector sensitivity at the high frequency around kHz, we did not ob...
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2022.12.15
Solar coronal waves: A debate for two decades
In 1997, the EIT telescope aboard the SOHO satellite (from NASA and ESA) discovered a global-scale wave phenomenon associated with solar flares, which was then called “EIT waves” or “solar tsunamis”. The physical nature of “EIT waves” has been debated for decades. The speaker will try to provide an overview of the related research, including recent progress.BIOPeng-Fei Chen is a solar phy...
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2022.12.01
Unveiling the astrophysics of cosmic reionization in the post-reionization era
Cosmic reionization is the last major phase transition that our Universe goes through. In this milestone, the intergalactic medium transitions from primarily neutral, dark, and cold into mainly ionized, more luminous, and warmer. However, as exciting as the reionization process surely was, many aspects remain unknown, e.g. what are the sources of the ionizing photons? or what is the timeline of...
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