Astronomers at the University of Chicago, MIT and elsewhere have used a massive cluster of galaxies as an X-ray magnifying glass to peer back in time, to nearly 9.4 billion years ago. In the process, ...
Figure 2: Summary of constraints on the size of the γ-ray emission zone of PKS 1830-211, compared to its characteristic distance scale. The measurement of the extremely compact size of the γ-ray ...
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