Prospects on the Extragalactic Background Light, the Early Universe and Cosmology with CTA

Details Prospects on the Extragalactic Background Light, the Early Universe and Cosmology with CTA Prospects on the Extragalactic Background Light, the Early Universe and Cosmology with CTA

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0503m&link_type=abstract

American Astronomical Society, HEAD meeting #12, #5.03

Physics

Scientific paper

Very high energy (VHE, E > 50 GeV) gamma-rays are absorbed via interaction with low-energy photons from the extragalactic background light (EBL) if the involved photon energies are above the threshold for electron-positron pair creation. The VHE gamma-ray absorption, which is energy dependent and increases strongly with redshift, distorts the VHE energy spectra observed from distant objects. Detection of the hard VHE gamma-ray spectra of distant sources (z = 0.11 - 0.54) by H.E.S.S., MAGIC and VERITAS enabled setting strong upper limits on the EBL density, using certain basic assumptions about blazar physics. These assumptions are, however, under discussion. Owing to its superior flux and energy resolutions as well as a lower energy threshold, the future CTA observatory will allow studying EBL density in much more detail. In particular, redshift dependent measurements of the EBL become possible enabling insights into star formation and galaxy evolution history. Furthermore, cosmology models can be tested and constraints on exotic interactions of VHE gamma-rays can be derived. In this talk, we give an overview of the EBL constraints, their limitations and new perspectives in view of the future CTA observatory.

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