Based on the spectroscopic and shear catalogs for SDSS galaxies in the local Universe, we compare optically-selected active galactic nuclei (AGNs) with control star-forming and quiescent galaxies on galactic, inter-halo and larger scales. We find that AGNs are preferentially found in two specific stages of galaxy evolution: star-burst and `green valley' phases, and that the stellar population...
本次报告中我将介绍近期我们从SDSS DR14 quasar catalog中构建出的，目前为止最大的一批极端光变类星体(EVQs)样本，包括其搜寻方法、物理性质和相关物理过程的探讨。EVQs被认为是用来研究变脸(changing-look)类星体以及类星体点燃和熄灭过程(turn on/off)比较理想的样本，对这种传统模型难以解释的短时标大幅度光变源的研究也可以加深我们对星系核活动相关物理过程的认识。因此我们近期从SDSS DR14Q出发结合PAN-STARRS数据，通过谨慎的筛选，找到了14,012个类星体样本，并根据其光谱观测时的高低态进行了分类叠加，分析了不同状态下EVQs与对照组在连续谱和宽发射线上的区别。此外我们还将简要介绍目前针对该样本中个源的研究进展和计划。
Fallback in core-collapse supernovae (CCSNe) plays an important role in determining the properties of the central compact remnants, which might produce a black hole (BH) hyperaccretion system in the centre of a massive CCSN. When the accretion
rate is extremely high and neutrino cooling is dominant, the hyperaccretion should be in the phase of the neutrino-dominated accretion flows (NDAFs),...
Recently, the XENON1T experiments has reported the possible detection of an excess in the electronic recoil spectrum. We use mirror DM and plasma DM model to explain this excess and predict the possible signal in the future nuclear direct detection.
