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Desai, A. ; Helgason, K. ; Ajello, M. ; Paliya, V. ; Domínguez, A. ; Finke, J. ; Hartmann, D. ( , The Astrophysical Journal)
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The Fermi-LAT Collaboration ( , Science)
The light emitted by all galaxies over the history of the Universe produces the extragalactic background light (EBL) at ultraviolet, optical, and infrared wavelengths. The EBL is a source of opacity for gamma rays via photon-photon interactions, leaving an imprint in the spectra of distant gamma-ray sources. We measured this attenuation using 739 active galaxies and one gamma-ray burst detected by the Fermi Large Area Telescope. This allowed us to reconstruct the evolution of the EBL and determine the star formation history of the Universe over 90% of cosmic time. Our star formation history is consistent with independent measurements from galaxy surveys, peaking at redshift
z ~ 2. Upper limits of the EBL at the epoch of reionization suggest a turnover in the abundance of faint galaxies atz ~ 6. -
Desai, A. ; Ajello, M. ; Omodei, N. ; Hartmann, D. H. ; Domínguez, A. ; Paliya, V. S. ; Helgason, K. ; Finke, J. ; Meyer, M. ( , The Astrophysical Journal)