A Possible Shutting-Down Event of Mass Accretion in An Active Galactic Nucleus at z~1.8

Tomoki Morokuma, Malte Schramm, Toshihiro Kawaguchi +11

We present the discovery of a large gradual apparent fading event in optical and near-infrared wavelengths in a quasar at z=1.767 by a factor of 20-30 (in optical) over a period of…