English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We revisit the limits of the level of the extragalactic background light (EBL) recently reported by the MAGIC collaboration based on the observed γ‐ray spectrum of the quasar 3C 279, considering the impact of absorption of high‐energy γ‐ray photons inside the broad‐line region (BLR) of the quasar. We use the photoionization code  cloudy  to calculate the expected optical–ultraviolet radiation field inside the BLR and the optical depth for a relatively extended set of the parameters. We found that the absorption of γ‐ray photons, though important for the estimate of the true radiative output of the source, does not produce an important hardening of the spectrum of 3C 279 in the energy band accessible by MAGIC, supporting the method used to infer the upper limits to the level of the EBL.

Intrinsic absorption in 3C 279 at GeV–TeV energies and consequences for estimates of the extragalactic background light