Neutrino point source searches with amanda ii m daq
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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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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

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


Review sensitivity

Review: Sensitivity

Improvement:

~30%


Use of energy information

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


2005 unblinding

2005 Unblinding

log10(p-value)

80% Chance of observing

p = 0.064 given 26 sources

Highest Significance: 3.58s

Chance Probability: 69%


2006 unblinding

2006 Unblinding

Significance

12% Chance of observing

p = 0.005 given 26 sources

Highest Significance: 3.58s

Chance Probability: 84%


2005 2006

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


Plans for 2000 2006

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


The crab because everyone keeps asking

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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