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Neutrino Point Source Searches with AMANDA-II m -DAQ

Neutrino Point Source Searches with AMANDA-II m -DAQ. Jim Braun IceCube Fall 2007 Collaboration Meeting. Progress Since Lake Geneva. 2005 unblinded: http://www.icecube.wisc.edu/~jbraun/2005_point_source/ 2006 unblinded: http://www.icecube.wisc.edu/~jbraun/2006_point_source/

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Neutrino Point Source Searches with AMANDA-II m -DAQ

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  1. Neutrino Point Source Searches with AMANDA-II m-DAQ Jim Braun IceCube Fall 2007 Collaboration Meeting

  2. Progress Since Lake Geneva • 2005 unblinded: • http://www.icecube.wisc.edu/~jbraun/2005_point_source/ • 2006 unblinded: • http://www.icecube.wisc.edu/~jbraun/2006_point_source/ • Improvements in methodology: • http://www.icecube.wisc.edu/~jbraun/2006_point_source/sensitivity.html • Internal report on methodology coming soon

  3. Review: Sensitivity Improvement: ~30%

  4. Use of Energy Information • Mean number of signal events required to reach 5s in 50% of simulated experiments at d=42.5o • 2006 data is background • Compare unbinned search with and without using Nch • Utilizing Nch information improves discovery potential for spectral indices g < 3.3 • Effect is 30% for E-2, representing a 45% total improvement over the binned search

  5. 2005 Unblinding log10(p-value) 80% Chance of observing p = 0.064 given 26 sources Highest Significance: 3.58s Chance Probability: 69%

  6. 2006 Unblinding Significance 12% Chance of observing p = 0.005 given 26 sources Highest Significance: 3.58s Chance Probability: 84%

  7. 3.82s Significance 2005 + 2006 Sensitivity of 2005-2006 analysis near E2dF/dE = 7x10-11 TeV cm-2 s-1 5 year search: 5x10-11 TeV cm-2 s-1 * 10-11 TeV cm-2 s-1

  8. Plans for 2000-2006 • Expect to combine 2005+2006 with 2000-2004 Zeuthen five year data set • Will not reoptimize cuts for 2000-2004 • Expected sensitivity: ~3x10-11 TeV cm-2 s-1 • Finish by the end of the year • Will not include 1997-1999 B10 data as previously planned • 465 total events in most recent 1997-1999 analysis • Considering poorer angular resolution and 25% contamination, equivalent to less than 40 days AMANDA-II livetime

  9. The Crab(Because Everyone Keeps Asking) • 2000-2004: Excess (10 events, 6 expected) • 2005-2006: Slight excess • 2006 IC-9: Excess • If the excesses are indeed a signal, we would possibly observe ~3s for this source • Significance reduced to ~2s with a catalogue of 26 sources • Depends on Nch values of events observed in 2000-2004

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