科学研究
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2023.03.23
Active Galactic Nuclei: Monsters to Scale or Puzzles to Solve?
Active Galactic Nuclei (AGNs) are the brightest sources of electromagnetic radiation in the universe, enabling us to observe them across the cosmos. AGNs are the central parts of galaxies.Most of their brightness results from the accretion of matter by a supermassive black hole (SMBH) at their center. Studying the AGNs informs us about the role of SMBHs in the formation and evolution of galaxie...
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2023.03.17
Changing-look AGNs in the Dark Energy Spectroscopic Instrument (DESI)
Changing-look (CL) phenomenon can be generally confirmed by the emergence or disappearance of Broad Emission Line, which challenge the understanding of AGN unification paradigm and accretion disk model. Dark Energy Spectroscopic Instrument (DESI) provides a unique opportunity to systematical study CL-AGNs, which enable us to investigate it by cross-matching the spectra of DESI early data and SD...
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2023.03.16
Microphysical and non-thermal processes in the circumgalactic medium: turbulence, magnetic fields and cosmic rays
Multiphase gas structure is ubiquitous in our universe. Recent observations suggest that large quantities of cool (10^4 K) gas are detected in the circumgalactic medium (CGM) of galaxy halos, which extends up to a few times of galactic virial radius. In addition, warm gas at a few 10^5 K is found to be tightly associated with the star-forming galaxies, but not the quenched ones. However, the or...
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2023.03.10
Strong magnetic field impact on the neutrino process inside the SNe explosion
Strong magnetic fields such as MHD-Jet SNe could exist in the inner region of the explosive astrophysical site. The phase space of the electrons is quantized inside the magnetic field so that the weak interaction rates deviate from the field-free case. This talk focuses on the (anti)neutrinos absorption process. This process is essential since it determines the opacity of the neutrino and the p...
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2023.03.09
Re-investigating A Puzzle in Kepler Planets
super-Earths and mini-Neptunes (shortened as 'kepler planets') are the most abundant type of planets known to us. Currently, their formation channel is under debate.In this talk, I will discuss our attempt to solve a small puzzle in the observations of these planets. We were led to claim that, after formation, each of these planets have scattered and digested a few Mars-massed objects. The smal...
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