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Neutrino Point Source Searches with AMANDA-II m -DAQPowerPoint Presentation

Neutrino Point Source Searches with AMANDA-II m -DAQ

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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

Jim Braun

IceCube Fall 2007 Collaboration Meeting

- 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

Improvement:

~30%

- 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

log10(p-value)

80% Chance of observing

p = 0.064 given 26 sources

Highest Significance: 3.58s

Chance Probability: 69%

Significance

12% Chance of observing

p = 0.005 given 26 sources

Highest Significance: 3.58s

Chance Probability: 84%

3.82s

Significance

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

- 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

- 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