Finding of a population of active galactic nuclei showing a significant luminosity decline in the past $\sim 10^{3-4}$ yrs

J. Pflugradt, K. Ichikawa, M. Akiyama +4

Recent observations have revealed an interesting active galactic nuclei (AGN) subclass that shows strong activity at large scales ($\sim 1$ kpc) but weaker at small scales ($<10$ pc…