Carlo Romoli (DIAS)
8/1/15, 11:00 AM
An extended observation campaign of the gamma-ray binary system PSR B1259-63 has been conducted with the H.E.S.S.II 5-telescope system during the source’s periastron passage in 2014. Here we report on the outcome of this campaign, which consists of more than 85 h of observations covering both pre/post-periastron orbital phases and, for the first time, very-high-energy (VHE, E > 100 GeV)...
Christian Mariaud (LLR - Ecole Polytechnique)
8/1/15, 11:15 AM
LS 5039 is a gamma-ray binary system observed in a broad energy range, from radio to TeV energies, which exhibits both flux and spectral modulation folded on its orbital period of $\sim 3.9$~d. The X-ray and very-high-energy (VHE, E > 100 GeV) gamma-ray fluxes display a maximum/minimum at inferior/superior conjunction, with spectra becoming respectively harder/softer, a behavior which is...
Alba Fernandez-Barral (Institut de Fisica d'Altes Energies (IFAE))
8/1/15, 11:30 AM
Transient and variable stellar objects provide a proper environment for particle acceleration and radiation of GeV-TeV gamma-rays. MAGIC Collaboration has carried out deep observations of different transient and variable stellar objects. Here we highlight 5 of them: LS I +61 303, MWC 656, SS 433, Cygnus X-1 and SN 2014J. We present the results of those observations, including long-term...
Pol Bordas (Max-Planc-Institut fur Kernphysik)
8/1/15, 11:45 AM
SS433 features the most energetic jets known in our Galaxy. A large fraction of the jet kinetic power is delivered to the surrounding W50 nebula at the jet termination shock, from which high-energy emission and cosmic-ray production have been anticipated. Here we report on the possible detection of a persistent gamma-ray signal from a source located within the 99.9 % confidence level contours...
Dr Olaf Reimer (Innsbruck University)
8/1/15, 12:00 PM
Eta Carinae, the so-far only colliding wind binary detected at high-energy gamma-rays, has been observed over its first complete orbit since launch of the Fermi Gamma-ray Space Telescope. Different emission scenarios are proposed to explain the temporal and spectro-temporal features, by either postulating strong dominance of hadronic particle populations, a single emitting particle population...
Victor Zabalza (University of Leicester)
8/1/15, 12:15 PM
Eta Carina is the only colliding-wind binary for which non-thermal emission is detected from hard X-rays to high-energy gamma rays. Although the physical conditions in the shock region change on timescales of hours to days, the variability seen at GeV energies is quite weak and on significantly longer timescales. The gamma-ray spectrum exhibits two spectral features that can be...