%0 Journal Article
%A Ajello, M.
%A Helgason, K.
%A Paliya, V.
%A Finke, J.
%A Dominguez, A.
%A Desai, A.
%A Ackermann, Markus
%A Bühler, Rolf
%A Franckowiak, Anna
%A Gallardo Romero, Galo Patricio
%T A γ-ray determination of the Universe's star-formation history
%J Science
%V 362
%N 6418
%@ 0036-8075
%C Cambridge, Mass.
%I Moses King
%M PUBDB-2019-00103
%M arXiv:1812.01031
%P 1031 - 1034
%D 2018
%Z © The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science
%X 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 γ rays via photon-photon interactions, leaving an imprint in the spectra of distant γ-ray sources. We measure this attenuation using 739 active galaxies and one gamma-ray burst detected by the <i>Fermi</i> Large Area Telescope. This allows 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 re-ionization suggest a turnover in the abundance of faint galaxies at z ∼ 6.
%F PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
%9 ReportJournal Article
%$ pmid:30498122
%U <Go to ISI:>//WOS:000451609000039
%R 10.1126/science.aat8123
%U https://bib-pubdb1.desy.de/record/417975