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Julia Becker for the IceCube collaboration August 2006

Implications of neutrino flux limits. by the AMANDA experiment. Julia Becker for the IceCube collaboration August 2006. Contents. Detection principle and detector Analysis methods and results point sources stacking of point sources diffuse signal Interpretation of the diffuse signal

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Julia Becker for the IceCube collaboration August 2006

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  1. Implications of neutrino flux limits by the AMANDA experiment Julia Becker for the IceCube collaboration August 2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  2. Contents • Detection principle and detector • Analysis methods and results • point sources • stacking of point sources • diffuse signal • Interpretation of the diffuse signal • Summary Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  3. p gD…pn...  N ...m, casc Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  4. 677 PMTs on 19 strings Cherenkov light South Pole Dome road to work AMANDA Summer camp 1500 m Amundsen-Scott South Pole Station 2000 m [not to scale] AMANDA/IceCube Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  5. Stacking strategy – sum signal of point sources of same source class Search for a diffuse signal: use complete northern hemisphere Detection strategies Point source searches – significance map ?clustering of neutrinos identified photon sources AMANDA/IceCube FoV: northern hemisphere Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  6. Other strategies Talks Doug Cowen, Ty DeYoung • Cascade analyses • Transient sources: • Flares of permanent objects • Gamma Ray Bursts  stacking approach, temporal clustering • SGR 1860-20 • Dark matter searches • WIMPs • Magnetic Monopoles • CR composition (IceTop) • Atmospheric muons, charm contribution • Acoustic detection Talk Elisa Resconi Poster Brennan Hughey Poster Juande Zornoza great but too short time! Poster Tom Gaisser Talks Stephan Hundertmark, Justin Vandenbroucke Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  7. Search for single point sources Event map – 4282 events in 5 years (2000-2004) –effective time: 1001 days No significant signal – Limit map 90% confidence levelflux upper limits for the northern hemisphere in 0.5 deg bins (15% systematic error included) preliminary! Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  8. Stacking of AGN • GeV blazars (EGRET) – GeV • Unidentified EGRET sources – unidGeV • Infrared sources – IR • HAEO-A-detected keV sources – keV(H) • ROSAT-detected keV sources – keV(R) • TeV blazars - TeV • Compact Steep Spectrum and Giga-Hertz peaked sources – CSS/GpS • FR-I galaxies including M87 – FR-I(M) • FR-I galaxies without M87 – FR-I • FR-II galaxies – FR-II • Radio-weak quasars – QSO preliminary! Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  9. Energy spectrum (2000) High energy limit (2000-2003) Hill et al., Neutrino 2006 Nellen Diffuse energy spectrum&limit Poster Jessica Hodges Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  10. X-ray AGN (I) Nellen,Mannheim&Biermann Phys.Rev.D (1993) Stecker&Salamon Space Science Rev. (1996) Limits&IceCube sensitivity Hill et al., Neutrino 2006 Limit strongly restrictive Favoring IC scenario Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  11. Not always E-2 Energy range of limits change with spectral index , E- Higher energies for flatter spectra Model-dependence of limit E-1 E-3 log(dN/dE*E2) E-2 log(E/GeV) preliminary! Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  12. X-ray AGN (II) Nellen,Mannheim&Biermann Phys.Rev.D (1993) Stecker&Salamon Space Science Rev. (1996) Limits&IceCube sensitivity Hill et al., Neutrino 2006 • Limit adjusted to model • 1 order of magnitude below flux Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  13. =  +g(TeV) =  Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  14. =  +g(TeV) z=1 ~10 =  z=0.3 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  15. TeV Blazars –  spectrum • Total diffuse  flux: • Neutrino flux up to a certain redshift: • Absorption factor: Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  16. Absorption factor conservative estimate: Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  17. Maximum contribution astro-ph/0607427 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  18. Summary • Point source analysis no significant signal • Source stacking: increase of sensitivity  limits to flux from source classes • Diffuse flux: strong constraints  • X-ray AGN: most likely X-rays from Inverse Compton • TeV-sources: limit to contribution of TeV-photon observable sources • Limits adjusted to different flux models • Very near future (9 strings working already!) Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

  19. IceCube! South Pole Station SPASE array AMANDA Geographic South Pole IceCube footprint(In-ice, IceTop) Talk Kael Hanson Skiway Posters Jon Dumm, Hagar Landsman Photograph: Forest Banks Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

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