科学研究
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2023.10.12
Formation of Merging Compact Binaries
The recent breakthrough in the detection of gravitational waves (GWs) from merging black hole (BH) and neutron star (NS) binaries by advanced LIGO/Virgo has generated renewed interest in understanding the formation mechanisms of merging compact binaries, from the evolution of massive stellar binaries and triples in the galactic fields, dynamical interactions in dense star clusters to binary mer...
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2023.10.10
Obstacles from interstellar matter and distortion for warp drive travel
We investigate obstacles of superluminal “warp drive” travels from interactions with interstellar matter and from curvature effects. The effect of collision of interstellar dust particles and photons with the spacecraft will all lead to a pressure proportional to the apparent velocity of the spaceship vs. The force exerted on the spacecraft from the curvature effect has two non-trivial compon...
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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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