Strange Green Peas Galaxies
On a quest to find Green Peas
© Carolin Cardamone and Sloan Digital Sky Survey
Of the one million galaxies that make up Galaxy Zoo’s image bank, the team found only 250 Green Peas. “No one person could have done this on their own,” Cardamone said. “Even if we had managed to look through 10,000 of these images, we would have only come across a few Green Peas and wouldn’t have recognized them as a unique class of galaxies.”
The galaxies, which are between 1.5 billion and 5 billion light years away, are 10 times smaller than our own Milky Way galaxy and 100 times less massive. But surprisingly, given their small size, they are forming stars 10 times faster than the Milky Way.
“They’re growing at an incredible rate,” said Kevin Schawinski, a postdoctoral associate at Yale and one of Galaxy Zoo’s founders. “These galaxies would have been normal in the early universe, but we just don’t see such active galaxies today. Understanding the Green Peas may tell us something about how stars were formed in the early universe and how galaxies evolve.”