The History and Environment of a Faded Quasar: Hubble Space Telescope observations of Hanny's Voorwerp and IC 2497 Tekijä Keel, W, Lintott, C, Schawinski, K, Bennert, V, Thomas, D, Manning, A, Chojnowski, S, Arkel, H, Lynn, S

The Galaxy Zoo survey for giant AGN-ionized clouds: Past and present black hole accretion events Tekijä Keel, W, Chojnowski, S, Bennert, V, Schawinski, K, Lintott, C, Lynn, S, Pancoast, A, Harris, C, Nierenberg, A, Sonnenfeld, A, Proctor, R

The Galaxy Zoo survey for giant AGN-ionized clouds: past and present black-hole accretion events Tekijä Keel, W, Chojnowski, S, Bennert, V, Schawinski, K, Lintott, C, Lynn, S, Pancoast, A, Harris, C, Nierenberg, A, Sonnenfeld, A, Proctor, R

HST Imaging of Fading AGN Candidates I: Host-Galaxy Properties and Origin of the Extended Gas Tekijä Keel, W, Maksym, W, Bennert, V, Lintott, C, Chojnowski, S, Moiseev, A, Smirnova, A, Schawinski, K, Urry, C, Evans, D, Pancoast, A, Scott, B, Showley, C, Flatland, K