Dr
Lara Nava
(HUJI)
04/08/2015, 11:00
CR-TH
Oral contribution
Recent advances on gamma-ray observations from SuperNova Remnants and Molecular Clouds offer the possibility to study in detail the properties of the propagation of escaping Cosmic Rays (CR). However, a complete theory for CR transport outside the acceleration site has not been developed yet. Two physical processes are thought to be relevant to regulate the diffusion: the growth of waves...
Simon Michael Kunz
(KIT - Karlsruhe Institute of Technology (DE))
04/08/2015, 11:15
CR-TH
Oral contribution
Transport models for galactic cosmic rays depend on a large number of
parameters which are poorly known and can be constrained only through
derived quantities by comparison with the observed spectra of various
cosmic ray species. Numerical models as implemented in the DRAGON or
GALPROP code describe a multitude of observations. However, degenerate
solutions limit the predictive power of...
Dr
Gwenael Giacinti
(Oxford U.)
04/08/2015, 11:30
CR-TH
Oral contribution
We show that the cosmic ray (CR) knee can be entirely explained by energy-dependent CR
leakage from the Milky Way, with an excellent fit to all existing data. We test this hypothesis
calculating the trajectories of individual CRs in the Galactic magnetic field. We find that the CR
escape time t(E) exhibits a knee-like structure around E/Z = few × PeV for small coherence
lengths and...
Dr
Dario Grasso
(INFN, Pisa)
04/08/2015, 11:45
CR-TH
Oral contribution
As recently shown, Fermi-LAT measurements of the diffuse gamma-ray emission of the Galaxy favor the presence of a smooth softening of the primary cosmic-ray spectrum with the Galactocentric distance. This result can be interpreted in terms of a spatial dependent rigidity scaling of the diffusion coefficient. The DRAGON code has been used to build a model which implements such feature...
sarah recchia
(Gran Sasso Science Institute)
04/08/2015, 12:00
CR-TH
Oral contribution
The transport of cosmic rays (CRs) in the Galaxy is known to be
affected by the presence of winds launched from the Galactic disc.
When these winds are pre-assigned, it is easy to check that the
effects on transport are limited to energies below $\sim 10$ GeV.
Moreover a boundary condition needs to be imposed at large distances
(above and below the disc) to ensure the stationarity of the...
Dr
Alexandre Marcowith
(LUPM)
04/08/2015, 12:15
CR-TH
Oral contribution
During their journey in the Galaxy, Cosmic Rays (CRs) are scattered by magnetic perturbations that can be well described by the magneto-hydrodynamic (MHD) theory. The very nature of the interaction still however remains largely unknown. In this work we investigate by the mean of direct numerical calculations the CR propagation in large scale driven turbulence. The MHD fluctuations are...
