2.5k citations · 6.5k across the 51 of their papers we have counts for
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astro-ph.CO2012★ 100 cited
The History and Environment of a Faded Quasar: Hubble Space Telescope observations of Hanny's Voorwerp and IC 2497
William C. Keel, Chris J. Lintott, Kevin Schawinski +6
We present Hubble Space Telescope imaging and spectroscopy for the extended high-ionization cloud known as Hanny's Voorwerp, near the spiral galaxy IC 2497. WFC3 images show comple…
astro-ph.CO2011★ 161 cited
The Galaxy Zoo survey for giant AGN-ionized clouds: past and present black-hole accretion events
William C. Keel, S. Drew Chojnowski, Vardha N. Bennert +8
Some active galactic nuclei (AGN) are surrounded by extended emission-line regions (EELRs), which trace both the illumination pattern of escaping radiation and its history over the…