Fermi observations of TeV AGN

Details Fermi observations of TeV AGN Fermi observations of TeV AGN

2009-12-23

arxiv.org/abs/0912.4616v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Proceedings of the 2009 Fermi Symposium, eConf Proceedings C091122, 3 pages, 6 figures

Scientific paper

We report on observations of TeV-selected AGN made during the first 5.5 months of observations with the Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope (Fermi). In total, 28 TeV AGN were selected for study. The Fermi observations show clear detections of 21 of these TeV-selected objects. Most can be described with a power law of spectral index harder than 2, with a spectral break generally required to accommodate the TeV measurements. Evidence for systematic evolution of the gamma-ray spectrum with redshift is presented and discussed in the context of the EBL.

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