Context:
But at a meeting of the American Physical Society in Washington DC on 16 February, the Auger team began to backpedal on its original conclusions. The group revealed new data that weaken the link between the high-energy particles and the AGN.
Compounding the mystery, the team has found evidence that these highest-energy cosmic rays might be iron nuclei, rather than the protons that make up most cosmic rays. "There are some puzzles," says Paul Sommers, co-spokesperson for the Auger collaboration at Pennsylvania State University in University Park. "We're not close to writing the final chapter."
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http://www.nature.com/news/2010/100222/full/4631011a.html
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