Measuring the Cosmic Star Formation Rate with Absorption of Gamma rays from Blazars

ORAL

Abstract

Gamma-rays from blazars interact with extragalactic background light (EBL) photons, and are absorbed. This allows one to use gamma-ray absorption to constrain the EBL, which depends strongly on the cosmic star formation rate. We combine results of gamma-ray absorption measurements from the Fermi Telescope with luminosity density measurements from galaxy surveys to provide a very tight constraint on the cosmic star formation rate and other cosmologically interesting parameters.

–

Authors

  • Justin Finke

    • United States Naval Research Laboratory

  • Marco Ajello

    • Clemson University

  • Alberto Dominguez

    • Universidad Complutense de Madrid

  • Dieter Hartmann

    • Clemson University

  • Abhishek Desai

    • University of Wisconsin-Madison

  • Lea Marcotulli

    • Clemson University

  • Vaidehi Paliya

    • DESY Zeuthen