Echo Mapping of Black Hole Accretion Flows in Active Galactic Nuclei

光传播时间延迟使活动星系核中的超大质量黑洞周围的吸积盘和宽阔的发射线区域能够进行微弧秒映射。利用我们在LCOGT机器人望远镜网络上分享的时间，以及来自HST、SWIFT和开普勒卫星的数据，我们正在监测活动星系核的光谱变化，以测量黑洞质量、吸积率和光度距离。通过解码混响发射线剖面中的信息，我们制作了宽发射线区域的二维速度-延迟图，绘制了吸积流的速度场和电离结构。学生将获得并分析这些数据集，使用MCMC方法拟合参数化模型，使用Horne最大熵拟合代码MEMECHO重建图像，以及光电离代码(如Ferland‘s Cloudy)。

Light travel time delays enable micro-arcsecond mapping of accretion discs and broad emission-line regions around the super-massive black holes in the nuclei of active galaxies. Using our share of time on the LCOGT robotic telescope network, along with data from HST, Swift and Kepler satellites, we are monitoring spectral variations of Active Galactic Nuclei to measure black hole masses, accretion rates, and luminosity distances. By decoding information in the reverberating emission-line profiles, we make 2-dimensional velocity-delay maps of broad emission-line regions, mapping the velocity field and ionisation structure of the accretion flows. The student will acquire and analyse such datasets, fitting parameterised models using MCMC methods, image reconstruction using Horne maximum entropy fitting code MEMEcho, and photo-ionisation codes such as Ferland's Cloudy.