2FHL J0826.1-4500: Discovery of a possible shock-cloud interaction on the Western edge of the Vela SNR. (arXiv:1811.05898v1 [astro-ph.HE])

2FHL J0826.1-4500: Discovery of a possible shock-cloud interaction on the Western edge of the Vela SNR. (arXiv:1811.05898v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Eagle_J/0/1/0/all/0/1">Jordan Eagle</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marchesi_S/0/1/0/all/0/1">Stefano Marchesi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Castro_D/0/1/0/all/0/1">Daniel Castro</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ajello_M/0/1/0/all/0/1">Marco Ajello</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Duvidovich_L/0/1/0/all/0/1">Laura Duvidovich</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tibaldo_L/0/1/0/all/0/1">Luigi Tibaldo</a>

We report on the investigation of a very high energy (VHE), Galactic
gamma-ray source recently discovered at >50GeV using the Large Area Telescope
(LAT) on board the Fermi-LAT. This object, 2FHL J0826.1-4500, displays one of
the hardest >50GeV spectra (gamma-ray photon index ~1.6) in the 2FHL catalog,
and a follow-up observation with XMM-Newton has uncovered diffuse, soft thermal
emission at the position of the gamma-ray source. A detailed analysis of the
available multi-wavelength data shows that this source is located on the
Western edge of the Vela supernova remnant (SNR): the observations and the
spectral energy distribution modelling support a scenario where this gamma-ray
source is the byproduct of the interaction between the SNR shock and a neutral
Hydrogen cloud. If confirmed, this shock-cloud interaction would make 2FHL
J0826.1-4500 a promising candidate for efficient particle acceleration.

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