Black holes have been the unifying theme of my astrophysical research, and in particular the interface between galaxies and supermassive black holes is where I spend most of my research time. I have spent a lot of time studying the relation between supermassive black holes and their host galaxies. Lately, I have been focussing on pairs of supermassive black holes, wether gravitationally bound (and thus binary black holes) or unbound (and possibly observable as dual active galactic nuclei). I am especially excited about gravitational wave astrophysics and synergies with electromagnetic astrophysics. Below are individual research projects that have come to some sort of completion and therefore worthy of sharing. I am working my way back to try to get everything in the last 10 years on here.
![Three-dimensional view of fundamental plane of black hole accretion. A cube is labeled with the following orthogonal axes and limits. X-axis: Radio [erg/s] 30–45; Y-axis: X-ray [erg/s] 30–45; Z-axis: Mass [solar] 0–15. A light blue plane cuts through data points which are clustered as red spheres at the high-mass end and blue cubes and cones at the low mass end.](https://kayhan.astro.lsa.umich.edu/wp-content/uploads/2019/01/x3d_3dfp_1.png)
