Speaker
Pol Bordas
(Max-Planc-Institut fur Kernphysik)
Description
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 around SS433/W50 obtained with the Fermi Large Area Telescope. The spectral energy distribution displays a maximum at $\sim$250 MeV and a sharp cutoff thereafter, strongly resembling the gamma-ray spectrum of solar flares, and suggesting that gamma-rays are rendered through proton-proton interactions. If the observed gamma-ray emission is produced in the SS433/W50 interaction regions and the same mechanism is operating in other baryon-loaded microquasar jets, their collective contribution could represent a significant fraction of the total galactic cosmic-ray flux at GeV energies.
| Registration number following "ICRC2015-I/" | 540 |
|---|---|
| Collaboration | -- not specified -- |
Primary author
Pol Bordas
(Max-Planc-Institut fur Kernphysik)
