Galaxy Zoo Green Peas: discovery of a class of compact extremely star-forming galaxies

@article{Cardamone2009GalaxyZG,
  title={Galaxy Zoo Green Peas: discovery of a class of compact extremely star-forming galaxies},
  author={Carolin Cardamone and Kevin Schawinski and Marc Sarzi and Steven Bamford and Nicola Bennert and Claudia Megan Urry and Chris J. Lintott and William C. Keel and John K. Parejko and Robert C. Nichol and Daniel Thomas and Daniel Andreescu and P. G. Murray and M. Jordan Raddick and An{\vz}e Slosar and Alexander S. Szalay and Jan vandenBerg},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2009},
  volume={399},
  pages={1191-1205}
}
We investigate a class of rapidly growing emission line galaxies, known as “Green Peas,” first noted by volunteers in the Galaxy Zoo project because of their peculiar bright green colour and small size, unresolved in SDSS imaging. Their appearance is due to very strong optical emission lines, namely [O III] �5007 ˚ A, with an unusually large equivalent width of up to �1000 ˚ A. We discuss a well-defined sample of 251 colour-selected ob jects, most of which are strongly star forming, although… 

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