科学研究
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2023.09.28
Cosmic neutrinos: a new window into the extreme Universe
In 2013, the IceCube Neutrino Observatory at the South Pole discovered an extragalactic high-energy diffuse neutrino flux, opening a new era for neutrino astronomy. However, the origin of this flux remains mostly unresolved to date. Identification of astrophysical neutrino sources would be the smoking evidence to unveil the century-long puzzle on origin of cosmic rays. Being neutral and interac...
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2023.09.26
Implication of UV variability for the abundance of bright galaxies at cosmic dawn 紫外光度波动对宇宙黎明时明亮星系丰度的影响
The JWST has uncovered a large population of UV-bright galaxies at redshifts above ~10, which surpasses the predictions from a range of theoretical models developed based on lower redshift galaxies. While various solutions have been proposed focusing on systematically increasing the UV photon yield in high-redshift galaxies, I will discuss in this talk an alternate solution from UV variability....
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2023.09.22
WALLABY detects two Polar Ring Galaxies
Polar ring galaxies (PRGs) exhibit an extendedring of material oriented perpendicular to the main disk, which provide crucialclues for galaxy evolutionand dynamics, such as galaxy interaction and gas accretion. In the WALLABY Pilot Data Release 1, we found two potential polar ring galaxies: NGC 4632 and NGC 6156. We used the iDaVIE virtual reality software todecompose gas within the disk and ri...
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2023.09.21
Thermal convection in rapidly rotating oblate spheroidal planets
Motivated by its applications to the interior dynamics of planets, the problem of thermal convection in rapidly rotating, self-gravitating fluid bodies has been widely modeled in spheres or spherical shells, which implicitly neglects the flattening effect due to the centrifugal force. However, recent Juno and Cassini missions have measured the gravitational fields of Jupiter and Saturn with ext...
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2023.09.19
Yan Liang and Ruizhe Feng
Speaker: Yan LiangTitle: Lensing, Dynamics & Mass Distribution of the Early-Type GalaxyAbstract:The mass structure, as one of the most important properties of early-type galaxy, is associated with the galactic formation and evolution. Nowadays, the gravitational lensing at the galaxy scale and dynamics information of the galaxy have been widely used to constrain the galaxy mass structure. In th...
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