Theoretical status of high energy cosmic rays and neutrinos

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Presentation transcript:

Theoretical status of high energy cosmic rays and neutrinos Dmitri Semikoz APC, Paris

Overview: Astrophysical neutrinos Galactic to extragalactic transition of cosmic rays Extragalactic UHECR sources Minimal model combining astrophysical neutrinos and UHECR Conclusions

Astrophysical neutrinos

IceCube 5160 PMs in 1 km3 From F.Halzen

interaction muon neutrino shielded and optically transparent medium muon travels from 50 m to 50 km through the water at the speed of light emitting blue light along its track interaction muon neutrino lattice of photomultipliers From F.Halzen

tracks and showers PeV ne and nt showers: 10 m long volume ~ 5 m3 isotropic after 25~ 50m From F.Halzen

muon neutrinos through the Earth  6 sigma From F.Halzen, Paris 2016

Neutrino astrophysics IceCube detected first astrophysical neutrinos. New field started: neutrino astrophysics. Best flux for cascades 1/E^(2.46+-0.14) Flux 1/E^2 disfavored with more then 3 sigma significance Muon neutrino data favors 1/E^2.06+-0.13 flux ! Flavor ratio consistent with 1:1:1 as expected Cosmogenic neutrinos best constrained by IceCube, but in case of nuclei primaries bigger detector needed to find flux Bigger detectors needed for next step

IceCube neutrino sky map 4 years E> 100 TeV and Fermi E>100 GeV 5 degree smoothed

IceCube + Fermi LAT all sky: protons 1/E^2.5 A.Neronov, D.S. arXiv:1412.1690

Evidence of Galactic component in 4 year IceCube data E>100 TeV A. Neronov & D.S. arXiv: 1509.03522

Post-trial probability is 1.7*10-3 A. Neronov & D.S. arXiv: 1509.03522

From F.Halzen, Paris 2016

up-going nm From F.Halzen, Paris 2016

6 years of IceCube data: sensitivity to Galactic plane IceCube collabortion, arXiv: 1607.08006

North and South sky: IceCube A. Neronov & D.S. arXiv: 1603.06733

First galactic diffuse sources A. Neronov & D.S. arXiv: 1603.06733

Transition from galactic to extragalactic cosmic rays

Dip model: Protons can fit UHECR data V.Berezinsky , astro-ph/0509069

Mixed composition model D.Allard, E.Parizot and A.Olinto, astro-ph/0512345

Detection techniques

Pierre Auger Observatory South site in Argentina almost finished North site – project The picture shows the southern site of the Auger Observatory. The surface array will have 1600 spaced 1.5 km (one mile) apart on a regular grid. The array will cover 3000 square kilometers. At the edges of the array there will be four enclosures each with six fixed telescopes. These telescopes together cover the whole sky above the array. Note the town of Malargüe in the south west corner of the array. The Auger campus is located on the edge of Malargüe. More about that later. Surface Array 1600 detector stations 1.5 Km spacing 3000 Km2 (30xAGASA) Fluorescence Detectors 4 Telescope enclosures 6 Telescopes per enclosure 24 Telescopes total

Tanks aligned seen from Los Leones

Auger composition 2009: nuclei!

Mixed composition model D.Allard, E.Parizot and A.Olinto, astro-ph/0512345

UHECR sources

UHECR sources with mixed composition From D.Allard et al

Anisotropy dipole Pierre Auger Collaboration, arXiv:1103.2721

Galactic sources: dipole calculation Turb. Magn. Field spectrum Kolmogorov/Kraichnan Lmax = 100-300 pc G.Giacinti, M.Kachelriess, D.S. and G.Gigl, arXiv:1112.5599

Auger cosmposition measurements Auger Collaboration, arXiv:1409.5083

Auger limit on Fe fraction

Extragalactic proton sources G.Giacinti et al,1502.01608

UHECR sources p-gamma interaction with tau>1 for nuclei D.Allard et al, 1505.1377 M.Unger et al, 1505.02153

Idea: nuclei interact with photon background and neutrinos escape M.Unger et al, 1505.02153

UHECR sources with tau>1 for nuclei D.Allard et al, 1505.1377

UHECR sources with tau>1 for nuclei M.Unger et al, 1505.02153

Problem: does not explain IceCube M.Unger et al, 1505.02153

UHECR, neutrino and gamma-ray sources

UHECR proton flux from Star Burst galaxies

Neutrinos not from GRB IceCube collaboration:1601.06484

Miltimessenger signal from BL Lacs: dependence on escape energy 0.3 TeV 100 TeV G.Giacinti, M.Kachelriess, O.Kalashev, A.Neronov and D.S., arXiv: 1507.07534

Fermi blazars and IceCube neutrinos A.Neronov et al, arXiv:1611.06338

Neutrinos not from blazars A.Neronov et al, arXiv:1611.06338

AGNs: Proton-proton interactions in the source region Kachelriess et al, 1704.06893

AGN’s: P-gamma + Proton-proton interactions in the source region Kachelriess et al, 1704.06893

Summary First diffuse neutrino flux measurements contain both galactic and extragalactic components. Evidence of Galactic component come in 4 years of IceCube cascade data Galactic component give at least 50% of total flux, but can be as low as 10% in the north sky Galactic to extragalactic transition is around 10 PeV in protons, i.e. one expects both contributions for 1 PeV neutrinos

Summary Extragalactic component was measured with 6 years of muon neutrino data. It has flux 1/E^2.1 above 200 TeV and unknown origin One can explain UHECR data with p-gamma interaction in UHECR sources Sources of UHECR can give main contribution to extragalactic astrophysical neutrinos if after p-gamma protons come through p-p interactions