# ICRC2015

July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

## COSMIC RAY TRANSPORT IN THE PRESENCE OF A CR-DRIVEN GALACTIC WIND

Aug 4, 2015, 12:00 PM
15m
Yangtze 2 (World Forum)

### Yangtze 2

#### World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution CR-TH

### Speaker

sarah recchia (Gran Sasso Science Institute)

### Description

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 problem. However, a Galactic wind can be driven by the gradient in the CR pressure, and the hydrodynamics of such winds has been studied in the past. We discuss a semi-analytical kinetic calculation of CR transport in a CR driven wind, that allows one to determine the CR spectrum and spatial distribution in the Galaxy, as well as the characteristics of the wind itself. In this highly non-linear approach, diffusion is due to scattering on self-generated Alfven waves and both diffusion coefficients and slope of the B/C ratio are outputs of the problem. Moreover, no artificial boundary condition at spatial infinity is needed. We discuss the implications of this physical model for the following observables: 1) CR spatial distribution in the disc of the Galaxy; 2) CR anisotropy; 3) Spatial profile of the diffuse radiation due to CR interactions. We also discuss preliminary results of the case in which neutral hydrogen in the circum-disc region is transported by the wind due to charge exchange reactions.
Collaboration -- not specified -- 656

### Primary authors

Pasquale Blasi (INAF) sarah recchia (Gran Sasso Science Institute)

### Presentation materials

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