科学研究
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2023.04.06
The environmental dependency of the stellar initial mass function
The stellar initial mass function (IMF) is one of the most important assumptions applied in astronomical studies. The stellar populations in the local universe appear to have a universal and invariant IMF which has been adopted as the standard canonical IMF since 1955. However, observations in recent decays suggest that the IMF, in fact, varies in more extreme environments. In this talk, I wil...
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2023.04.03
Complicated life of massive stars: the effect of rotation and binarity
Massive stars are crucial in our understanding of many areas of modern astrophysics. Despite considerable efforts, there remain numerous unanswered questions regarding the formation and evolution of massive stars. Young star clusters are ideal laboratories to gauge stellar theory, because they are believed to be ensembles of co-eval stars with identical initial chemical compositions. However, r...
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2023.03.24
Supercritical growth of seed BHs at cosmic dawn and co-evolution with host galaxies: a perspective regarding outflows
Supercritical growth of massive/stellar mass seed BHs at high-z universe is believed to be one of the possible solutions to grow the observed supermassive black holes (SMBHs) at z~6. We study the long-term evolution of the global structure of axisymmetric accretion flows onto a black hole (BH) at rates substantially higher than the Eddington value, performing two-dimensional radiation hydrodyna...
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2023.03.20
Models for binary-neutron-star mergers in the multi-messenger era
It has been more than half a decade since the first joint detection of gravitational wave and its electromagnetic counterparts (GW170817). The physical models on binary-neutron-star (BNS) mergers are continuously challenged by the ongoing observational facts and the progress in simulation. I will be briefly reviewing the history of models for BNS mergers and presenting the efforts we have made ...
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2023.03.13
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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