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 1: Fermi/LAT light curves of PKS 1830-211 over the flaring episodes, produced with adaptive time binning. Figure 2: Summary of constraints on the size of the γ-ray emission zone of PKS 1830-211 ...