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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The high-energy-peaked BL Lac H 2356-309 (z=0.165) was detected by HESS atvery high energies (VHE, >100 GeV) with relatively high significance in theyears 2004-2007, allowing a good determination of its gamma-ray spectrum. Aftercorrection for the interaction with the diffuse extragalactic background light(EBL), the VHE spectrum is flat (Gamma~1.9-2) over a decade in energy, locatingthe gamma-ray peak around or above 0.6-1 TeV. This is remarkably at odds withthe interpretation and modeling provided by HESS, which do not correspond tothe source properties and can be excluded with high confidence. The overallGeV-to-TeV characteristics of H 2356-309 seem intermediate between the"TeV-peaked" (Fermi-faint) and "100 GeV-peaked" (Fermi-bright) BL Lac objects,and difficult to reconcile with the shape of the synchrotron emission in asingle-zone SSC scenario.

On the correct intrinsic VHE properties of the BL Lac H 2356-309