Chr. Science Monitor, Nat’l Geo, Sci News etc: Big time astronomers turn amateurs loose in their data. The hobbyists find green peas, lots of them
Wednesday, July 29th, 2009
The human brain is eerily adept at spotting patterns and repetitions in imagery. Astronomers assembling huge surveys of the visible universe are overwhelmed with data. Recently they found a solution: find ordinary folks with the stick-to-itiveness to pore through sky images by the hour. Who better than amateur astronomers? Many such are among the 230,000 volunteers signed up to look at and classify images of more than one million galaxies.
The latter, now giving themselves such names as the Peas Corp. and the Peas Brigade, found in the vast archives of a project of the Sloan Digital Sky Survey called Galaxy Zoo several hundred little green dots that they called green peas. No ordinary team of professiional astronomers, not even post-docs and grad students strapped to their chairs, could have done it. Perhaps no robot scanner could plausibly have been programmed to notice them as somehow odd. But the volunteers, comparing notes, did. Somewhat starlike in a naive and fast glance, the green peas turn out on close examination to be small galaxies far away that are, for their size, churning out stars much faster than do typical galaxies. The results are in a paper – its lead author a Yale grad student working with the volunteers - due for publication in Monthly Notices of the Royal Astronomical Society.
Stories:
- Christian Science Monitor – Pete Spotts: New class of galaxies: small, green, and bursting with new stars; A feather in the cap, he writes, for ‘citizen science’. The green color, he explains further, arises from highly energized oxygen atoms churned to frenzy by the high concentration of new stars.
- Science News – Ron Cowen : Galaxies Going Green ; Nice job getting into the mystery of the little galaxies’ relative close distance combined with a behavior more typical of an earlier epoch in the universe. He also provides some context, via separate, new reports on more distant “Lyman-break” galaxies also forming stars fast.
- National Geographic – Rachel Kaufman: ‘Green Pea” Pictures: New Galaxy Class Discovered ;
Grist for the Mill:
Yale University Press Release ; arXiv Article Galaxy Zoo Green Peas: Discovery of A Class of Comparct Extremely Star-Forming Galaxies ;
-CP