# ICRC2015

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

## Galactic contribution to the IceCube astrophysical neutrino signal

Aug 1, 2015, 3:30 PM
1h
Amazon Foyer Terrace (World Forum)

### Amazon Foyer Terrace

#### World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 291
Poster contribution NU-TH

### Speaker

Andrii Neronov (University of Geneva)

### Description

Neutrino telescope IceCube has recently discovered astrophysical neutrinos with energies in the TeV-PeV range. We use the data of Fermi gamma-ray telescope to demonstrate that the neutrino signal has significant contribution from the Milky Way galaxy. Matching the gamma-ray and neutrino spectra we find that TeV-PeV Galactic cosmic rays form a powerlaw spectrum with the slope $p\simeq 2.5$. This spectral slope is harder than previously thought, but it is compatible with that of the locally observed spectra of cosmic ray nuclei in the same energy range. It is also consistent with the theoretical model of cosmic ray injection by diffusive shock acceleration followed by escape through the Galactic magnetic field with Kolmogorov turbulence. The locally observed cosmic ray proton spectrum is softer than the average Galactic cosmic ray spectrum. This could be explained by variability of injection of cosmic rays in the local interstellar medium over the past $10^7$ yr.
Collaboration -- not specified -- 205

### Primary authors

Andrii Neronov (University of Geneva) Dmitri Semikoz (APC - Paris Diderot)

### Presentation materials

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