A $\gamma$-ray determination of the Universe's star-formation history

The Fermi-LAT Collaboration,; Ajello, M.; Helgason, K.; Paliya, V.; Finke, J.; Dominguez, A.; Desai, A.

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A $\gamma$-ray determination of the Universe's star-formation history

The Fermi-LAT Collaboration, Ajello, M., Helgason, K., Paliya, V., Finke, J., Dominguez, A., et al. (2018). A $\gamma$-ray determination of the Universe's star-formation history. Science Magazine, (362), 1031. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-380.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0003-F971-5 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0003-F972-4

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Urheber:
The Fermi-LAT Collaboration¹, Autor
Ajello, M.¹, Autor
Helgason, K.¹, Autor
Paliya, V.¹, Autor
Finke, J.¹, Autor
Dominguez, A.¹, Autor
Desai, A.¹, Autor

Affiliations:
1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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Schlagwörter: Fermi

Zusammenfassung: 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 $z\sim 6$.