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Swift discoveries of new populations of extremely long duration high energy transient
Levan, A. J.
Recent observations with Swift have begun to uncover γ-ray transients whose total energies are comparable to those of gamma-ray bursts (GRB), but have a duration an order of magnitude or more longer than the bulk of the GRB population. Some are suggested to form a new population of ultra-long GRBs, with a mean duration around 104 s, whi…
Estimating Galactic gas content using different tracers: Compatibility of results, dark gas, and unidentified TeV sources
Torres, Diego F.; de Oña Wilhelmi, Emma; Natale, Giovanni +1 more
A large fraction of Galactic very-high energy (VHE; E ≳ 100 GeV) γ-ray sources is cataloged as unidentified. In this work we explore the possibility that these unidentified sources are located in environment particularly rich in material content unaccounted by traditional tracers. In a scenario where the VHE emission is due to the interaction of t…