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Gems of the Galaxy Zoos—A Wide-ranging Hubble Space Telescope Gap-filler Program*

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  • William C. Keel
  • Jean Tate
  • O. Ivy Wong
  • Julie K. Banfield
  • Chris J. Lintott
  • Karen L. Masters
  • Brooke D. Simmons
  • Claudia Scarlata
  • Carolin Cardamone
  • Rebecca Smethurst
  • Lucy Fortson
  • Jesse Shanahan
  • Sandor Kruk
  • Izzy L. Garland
  • Colin Hancock
  • David O’Ryan
Article number150
<mark>Journal publication date</mark>1/04/2022
<mark>Journal</mark>The Astronomical Journal
Issue number4
Publication StatusPublished
Early online date7/03/22
<mark>Original language</mark>English


We describe the Gems of the Galaxy Zoos (Zoo Gems) project, a gap-filler project using short windows in the Hubble Space Telescope's schedule. As with previous snapshot programs, targets are taken from a pool based on position; we combine objects selected by volunteers in both the Galaxy Zoo and Radio Galaxy Zoo citizen-science projects. Zoo Gems uses exposures with the Advanced Camera for Surveys to address a broad range of topics in galaxy morphology, interstellar-medium content, host galaxies of active galactic nuclei, and galaxy evolution. Science cases include studying galaxy interactions, backlit dust in galaxies, post-starburst systems, rings and peculiar spiral patterns, outliers from the usual color–morphology relation, Green Pea compact starburst systems, double radio sources with spiral host galaxies, and extended emission-line regions around active galactic nuclei. For many of these science categories, final selection of targets from a larger list used public input via a voting process. Highlights to date include the prevalence of tightly wound spiral structure in blue, apparently early-type galaxies, a nearly complete Einstein ring from a group lens, redder components at lower surface brightness surrounding compact Green Pea starbursts, and high-probability examples of spiral galaxies hosting large double radio sources.