Neta A. Bahcall, Eugene Higgins Professor of Astrophysics and Director of the Undergraduate Program in Astrophysics and Andrés Plazas Malagón, Associate Research Scholar, along with an international team, recently published a study which measured the distribution of dark matter around galaxies to redshifts of 4, corresponding to a time a mere 1.5 billion years after the Big Bang.  observes dark matter farther back than ever before.  The group measured the lensing of the Cosmic Microwave Background (CMB) by galaxies detected by the Hyper Suprime-Cam wide-field imager.  “This result gives a very consistent picture of galaxies and their evolution, as well as the dark matter in and around galaxies, and how these galaxies evolve with time,” said Bahcall.  The paper was published in Physical Review Letters on August 1, 2022 and can be read here.

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