中等质量黑洞的X射线和宽波段SED研究

中等质量黑洞，黑洞质量范围为几百到几百万太阳质量，对于研究黑洞的形成、演化和吸积物理有着非常重要的意义，但是由于目前探测数量较少，我们对于它们的认识，尤其是在X射线和光谱能量分布（SED）方面，仍然不足。在本项目中，我们将利用之前工作中得到的中等质量黑洞活动星系核样本，研究该群体的X射线和SED方面的性质。我们将对该样本进行X射线能谱和时变数据分析，获得连续谱、软X射线超、功率谱、光变幅度等观测量的参数测量；同时我们将考察这些观测量与AGN参数之间的依赖关系，并与经典AGN进行比较。除X射线之外，我们还将处理该样本的光学/紫外的图像数据，来研究中等质量黑洞AGN的SED特征。本项目旨在为理解AGN黑洞，尤其是低质量端黑洞，附近的吸积过程和物理状态提供新的启示。

Intermediate-mass black hole (IMBH) with masses in the range of a few hundreds to several millions of solar mass are important in studies of black hole seeding, evolution, and accretion physics, but little is known about IMBH as a population due to their rarity, especially in the fields of X-ray and spectral energy distribution (SED). In this project, we will study the properties and features of the X-ray and broad-band SED by making use of the IMBH AGN samples achieved in our recent work. X-ray spectroscopic and timing analyses will be conducted for this sample, measuring the continua, soft X-ray excess, power spectrum density, variability amplitude, etc.; dependence of these quantities on AGN parameters will be examined and these would be compared with those of classical AGNs. Apart from the X-ray, analysis on images in optical/UV will also be carried out to explore the SED features of AGNs in the low-mass end. The ultimate goals of this project are to shed light on the accretion processes and physical conditions near the massive black holes, especially in the low-BH-mass regime.