Report/Journal Article

PUBDB-2019-00103

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A $\gamma$-ray determination of the Universe's star-formation history

Ajello, M. (Corresponding author) ; Helgason, K. (Corresponding author) ; Paliya, V. (Corresponding author)Extern* ; Finke, J. (Corresponding author) ; Dominguez, A. ; Desai, A. (Corresponding author) ; Ackermann, M.DESY* ; Bühler, R.DESY* ; Franckowiak, A.DESY* ; Gallardo Romero, G. P.DESY* ; Fermi-LAT Collaboration (Collaboration author)

2018
Moses King Cambridge, Mass.

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Please use a persistent id in citations: doi:10.1126/science.aat8123  doi:10.3204/PUBDB-2019-00103

Report No.: arXiv:1812.01031

Abstract: 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 measure this attenuation using {739} active galaxies and one gamma-ray burst detected by the {\it Fermi} 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 $z\sim2$. Upper limits of the EBL at the epoch of re-ionization suggest a turnover in the abundance of faint galaxies at $z\sim 6$.

Note: © The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science

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Contributing Institute(s):

1. Astroteilchenphysik (ZEU-EXP/AT)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)

Experiment(s):

1. The Fermi Large Area Telescope

Appears in the scientific report 2018

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