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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 redshiftz~ 2. Upper limits of the EBL at the epoch of reionization suggest a turnover in the abundance of faint galaxies atz~ 6.more » « less
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Desai, A.; Ajello, M.; Omodei, N.; Hartmann, D. H.; Domínguez, A.; Paliya, V. S.; Helgason, K.; Finke, J.; Meyer, M. (, The Astrophysical Journal)
