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venice. XIII. francis halzen University of Wisconsin http://icecube.wisc.edu. it’s the technology ! cosmic accelerators neutrinos associated with Galactic cosmic rays extragalactic cosmic rays status of neutrino astronomy to lower energies to higher energies conclusions. menu.

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venice

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  1. venice XIII francis halzen University of Wisconsin http://icecube.wisc.edu

  2. it’s the technology ! cosmic accelerators neutrinos associated with Galactic cosmic rays extragalactic cosmic rays status of neutrino astronomy to lower energies to higher energies conclusions menu

  3. 1960

  4. M. Markov B. Pontecorvo M.Markov : we propose to install detectors deep in a lake or in the sea and to determine the direction of charged particles with the help of Cherenkov radiation.

  5. shielded and optically • transparent medium m n • lattice of photomultipliers

  6. F. Reines K. Greissen Requires Kilometer-Scale Neutrino Detectors

  7. kilometer-scale neutrino detectors

  8. 1987: DUMAND test string

  9. Lake Baikal ice as a natural deployment platform neutrinos! Camp

  10. 1993 AMANDAdeconstructingn astronomy

  11. Antares Nestor March 17, 2003 2 strings connected 2400 m deep start 2006 March 29, 2003 1 of 12 floors deployed 4000 m deep mediterranean detectors Nemo towards KM3NeT

  12. 2008BaikalANTARESAMANDAIceCube59 out of 86 strings

  13. 2006-2007: 13 Strings 2007-2008: 18 Strings 2004-2005 : 1 String 2008-2009: 18+1 Strings 2005-2006: 8 Strings 1450 m 2450 m since jan 09  59 out of 86

  14. IceCube Neutrino Observatory South Pole Drilling Seasons 1996/2000 Seasons -AMANDA2008/2009 Season - 18 Strings 2005/2006 Season - First String 2009/2010 Season - 16 to 19 Strings 2006/2007 Season - 8 Strings 2010/2011 Season - 18 to 20 Strings 2007/2008 Season - 13 Strings 2011/2012 Season - Remaining 6 to 15 Strings • Avg. time to deep drill hole 41hrs • Avg. hole depth 2452 m • Avg. drilling rate 1.7 m/min • Avg. fuel per hole 5 ,520 gal • Drill thermal power output 4.7 MW • Avg. string deployment time 8 hrs

  15. IceCube then and now simple 8-fold majority trigger neutrino area predicted performance level 2 (red) Astroparticle Physics 20, 507 (2004) deep core

  16. back to neutrinos…50 years later • we have detected neutrinos, in ice and in water • we know how to build kilometer-scale detectors • an impressive achievement

  17. separate neutrinos (filtered by the Earth) from down- going cosmic ray muons at a level of much less than one per million  the challenge: p  atm p

  18. IceCube 22

  19. one in 106 muon tracks is produced by a neutrino

  20. within trigger time window down down down up

  21. IceCube background: downgoing cosmic ray muons ~ 2000 per second signal: upgoing muons initiated by neutrinos ~ 10 per hour

  22. IceCube (40) turns the corner at the horizon

  23. ANTARES EVENTDISPLAY EXAMPLE OF NEUTRINO CANDIDATE Neutrino Astronomy ANTARES Height of hit OM Analysis of the5Line data 26 Time of hit Example of a reconstructed up-going muon (i.e. a neutrino candidate) detected in 5/12 detector lines.

  24. Dornic, Moriond 2009 ANTARES

  25. is the background more interesting ? the muon sky is not isotropic Tibet array: northern hemisphere

  26. the 100 TeV cosmic ray sky is not isotropicIceCube4x109 muons of 14TeV

  27. Milagro cosmic ray sky between a few and 30 degrees 3 degree point source

  28. 50 years later • we have detected neutrinos, in ice and in water • we know how to build kilometer-scale detectors • an impressive achievement, but after 10,000 n’s • we have still not detected a cosmic neutrino after early 1990’s days of irrational exhuberance the predictions have been stable and the goals defined

  29. it’s the technology ! cosmic accelerators neutrinos associated with Galactic cosmic rays extragalactic cosmic rays status of neutrino astronomy to lower energies to higher energies conclusions menu

  30. nature’s accelerators ? protons > 108 TeV photons > 102 TeV neutrinos > 102 TeV

  31. shock acceleration (solar flare) coronal mass ejection  10 GeV particles

  32. cassiopeia A supernova remnant in X-rays shock fronts acceleration when particles cross high B-fields

  33. large magnetic field inyoung supernova remnants

  34. and when the star collapses to a black hole …

  35. collapse of massive star produces a gamma ray burst spinning black hole g’s and protons (cosmic rays) coexist  produce n’s

  36. active galaxyparticle flowspowered by thegravity ofsupermassiveblack hole

  37. Neutrino Beams: Heaven & Earth n and g beams : heaven and earth NEUTRINO BEAMS: HEAVEN & EARTH Black Hole Radiation Enveloping Black Hole p + g n + p+ ~ cosmic ray + neutrino p + p0 ~ cosmic ray + gamma

  38. it’s the technology ! cosmic accelerators neutrinos associated with cosmic rays Galactic cosmic rays extragalactic cosmic rays status of neutrino astronomy to lower energies to higher energies conclusions menu

  39. galactic and extragalactic cosmic rays galactic extragalactic

  40. galactic cosmic rays 10-41 erg/cm3 energy (eV) galactic cosmic rays 10-12 erg/cm3 / / / / / / / / / / / / / / / / / CMB Radio Visible extragalactic cosmic rays 10-19 erg/cm3 flux 410 photons of 2.7 K or 10-12 erg/cm3 GeV g-rays

  41. energy in extra-galactic cosmic raysis~ 3x10-19 erg/cm3 3x1044 erg/s per active galaxy 2x1052 erg per gamma ray burst energy in cosmic rays ~ photons ~ neutrinos

  42. neutrinos associated with extragalactic cosmic rays AMANDA IceCube

  43. active galaxy Centaurus A M87 Fornax A … supermassive supermassive black hole black hole • accretion disk jet •

  44. Auger : the sources revealed ?

  45. centaurus A (variability !)

  46. neutrino astronomy kilometer scale detectors have the capability of detecting astrophysical neutrinos from cosmic sources with an energy density in neutrinos comparable to their energy density in the observed cosmic rays • this is the case for gamma ray bursts if they are the • sources of the extragalactic cosmic rays • for active galaxies it is also the case but the uncertain- • ties are very large because of the variability of the • sources • it is definitely the case for galactic supernova remnants

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