Spectral candles to measure the Extragalactic Background Light

Mankuzhiyil, N. and Persic, M. and Tavecchio, F. (2011) Spectral candles to measure the Extragalactic Background Light. Il nuovo cimento C, 34 (3). pp. 247-251. ISSN 1826-9885

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Extragalactic Background Light (EBL) is the integrated light from all stars that have ever formed, and spans in a range of Infrared (IR) to Ultraviolet (UV). The interaction of very-high-energy (VHE: E > 100 GeV) γ-rays emitted by Active Galactic Nuclei (AGN) at cosmological distances with the EBL results in electron-positron pair production that leads to an energy-dependent attenuation of the observed VHE flux. Here we introduce a method based on the attenuation to measure the EBL photon number density. We then apply this method on simultaneous blazar data—PKS 2155-304—to determine the optical density at z = 0.12 and compare it with the optical densities predicted by popular EBL models.

Item Type: Article
Uncontrolled Keywords: Background radiations ; Active and peculiar galaxies and related systems (including BL Lacertae objects, blazars, Seyfert galaxies, Markarian galaxies, and active galactic nuclei)
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 06 Apr 2020 18:45
Last Modified: 06 Apr 2020 18:45
URI: http://eprints.bice.rm.cnr.it/id/eprint/17278

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