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We report the discovery of a ~100 kpc ionized nebula associated with theradio quiet type 2 quasar (QSO2) nicknamed the "Teacup" (z=0.085). The giantnebula is among the largest known around active galaxies at any z. We proposethat it is part of the circumgalactic medium (CGM) of the QSO2 host, which hasbeen populated with tidal debris by galactic interactions. This rich gaseousmedium has been rendered visible due to the illumination by the powerful activenucleus (AGN). Subsolar abundances (~0.5Z(sun)) are tentatively favored by AGNphotoionization models. We also report the detection of coronal emission (Fe+6)from the NE bubble, at ~9 kpc from the AGN. The detection of coronal lines atsuch large distances from the AGN and the [NII]/Halpha, [SII]/Halpha,[OI]/Halpha optical emission line ratios of the giant nebula are consistentwith the fading quasar scenario proposed by Gagne et al. (2014). The fadingrate appears to have been faster in the last ~46,000 yr. Deep wide fieldintegral field spectroscopy of giant nebulae around powerful AGN such as the"Teacup's" with instruments such as MUSE on VLT opens up a way to detect andstudy the elusive material from the CGM around massive active galaxies thanksto the illumination by the luminous AGN.

A 100 kpc nebula associated with the "Teacup" fading quasar