Oct 15 – 20, 2017
Congress Center Garmisch-Partenkirchen
Europe/Berlin timezone
The proceedings of the 7th Fermi Symposium are available at https://pos.sissa.it/312/

Measuring the Galaxy Luminosity Density out to z~6 with Fermi-LAT

Oct 19, 2017, 2:30 PM
GaPa/1-1 - Olympiasaal (Garmisch-Partenkirchen)

GaPa/1-1 - Olympiasaal


Contributed talk Extragalactic Diffuse & EBL Extragalactic diffuse & EBL II


Kari Helgason (Max Planck Institute for Astrophysics)


The Extragalactic Background Light (EBL) absorbs gamma-rays (γγ->e-e+) and leaves a characteristic imprint in the spectra of high energy blazars. Utilizing the new Fermi-LAT measurement of the gamma-ray optical depth at 0<z<3, we reconstruct the detailed build-up of the EBL over cosmic time in a model-independent way. We use an MCMC approach to determine the instantaneous luminosity density of galaxy populations from the UV to the near-IR out to z~6. This allows us to constrain both the cosmic star formation rate density and the build-up of stellar mass over 90% of cosmic time. We also present limits on the amount light from faint undetected galaxies during the epoch of reionization.

Primary author

Kari Helgason (Max Planck Institute for Astrophysics)


Abhishek Desai (Clemson University) Alberto Dominguez (Universidad Complutense de Madrid) Justin Finke (US Naval Research Laboratory) Prof. Marco Ajello (Clemson University) Vaidehi Sharan Paliya` (Clemson University)

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