科学研究
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2024.10.17
Hypervelocity stars: energetic guys “kissed” by massive black holes
The so-called Hypervelocity stars (HVSs; with velocities even greater than 1000 km/s) were first predicted from the theoretical arguments of Hills (1988), and attributed to be the result of tidal interaction between a close stellar binary system and a supermassive black hole (SMBH) in the Galactic center, commonly referred to as the “Hills mechanism”. HVSs or High-Velocity stars (HiVels) can ...
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2024.10.11
Investigating the link between the growth of SMBHs and their host galaxies with X-ray surveys
X-ray surveys have been an effective way to study growing supermassive black holes (SMBHs). Utilizing X-ray survey fields that have extensive multiwavelength data coverage, we can probe how SMBH growth links with the properties of their host galaxies, which will ultimately help to investigate the physical mechanisms behind the potential coevolution of SMBHs and their hosts. In my talk, I will p...
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2024.10.10
Probing the spacetime variation of the fine-structure constant using emission-line galaxies
The Standard Model of particle physics assumes that fundamental physical constants, including the fine-structure constant alpha, are universal and constant. On the other hand, modern theories beyond the Standard Model predict or even require the variation of the fundamental constants. Recently, we developed a new method to probe the variation in alpha using narrow and strong [O III] emitting ga...
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2024.09.27
AGN SED Modeling: AGN luminosity in the simulated universe and implications on the era of reionization
The study of the spectral energy distribution (SED) of active galactic nuclei (AGN) plays an important role in several aspects of the evolution of the galaxy. In this work, we model the black hole (BH) accretion flow for a wide range of BH mass and accretion rate. The accretion flow is divided into two regimes based on the Eddington-normalized accretion rate value - the ADAFs for low accretion ...
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2024.09.26
Quest for the origin of neutrinos
The discovery of neutrino oscillation established a non-zero mass of neutrino. The origin of neutrino and its non-zero mass is an one of the most important experimental clues to the new physics beyond the standard model. Neutrinos are ubiquitous in the universe, accompanying most of the weak-interacting physics processes. I shall review natural and artificial sources of neutrinos with an emph...
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