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

The high-energy-peaked BL Lac H 2356-309 (z=0.165) was detected by HESS at very high energies (VHE, >100 GeV) with relatively high significance in the years 2004-2007, allowing a good determination of its gamma-ray spectrum. After correction for the interaction with the diffuse extragalactic background light (EBL), the VHE spectrum is flat (Gamma~1.9-2) over a decade in energy, locating the gamma-ray peak around or above 0.6-1 TeV. This is remarkably at odds with the interpretation and modeling provided by HESS, which do not correspond to the source properties and can be excluded with high confidence. The overall GeV-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 a single-zone SSC scenario.

preprint2012arXivOpen access

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