SIMBAD references

2013A&A...554A..75S - Astronomy and Astrophysics, volume 554A, 75-75 (2013/6-1)

Evidence for a cosmological effect in γ-ray spectra of BL Lacertae.


Abstract (from CDS):

We update the list of GeV-TeV extragalactic γ-ray sources using the two-year catalog from the Fermi Large-Area Telescope (LAT) and recent results from ground-based γ-ray telescopes. Breaks in the spectra between the high-energy (100MeV<E<300GeV) and the very high-energy (E>200GeV) ranges, as well as their dependence on distance, are discussed in the context of absorption on the extragalactic background light (EBL). We calculate the size of the expected break using a model for the EBL and compare it to the data, taking into account systematic uncertainties in the measurements. We develop a novel Bayesian model to describe this dataset and use it to constrain two simple models for the EBL-induced breaks.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: general - cosmic background radiation - gamma rays: galaxies

Simbad objects: 36

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