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/ Improvements in methodology: http://www.icecube.wisc.edu/~jbraun/2006_point_source/sensitivity.html Internal report on methodology coming soon

Review: Sensitivity Improvement: ~30%

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 NGC 1275 0.064 Object P-value MGRO J2019+37 0.152 Mrk 501 0.184 Mrk 421 ~1 NGC 1275 0.064 Crab Nebula Cyg X-3 0.458 GRS 1915+105 0.581 log10(p-value) 80% Chance of observing p = 0.064 given 26 sources Highest Significance: 3.58s Chance Probability: 69%

2006 Unblinding GRS 1915+105 0.005 Object P-value MGRO J2019+37 0.064 Mrk 501 ~1 Mrk 421 0.227 NGC 1275 Crab Nebula 0.456 Cyg X-3 0.012 GRS 1915+105 0.005 Significance 12% Chance of observing p = 0.005 given 26 sources Highest Significance: 3.58s Chance Probability: 84%

2005 + 2006 3.82s * 10-11 TeV cm-2 s-1 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 Object P-value m90* MGRO J2019+37 0.065 12.83 Mrk 501 0.228 8.83 Mrk 421 ~1 5.71 NGC 1275 0.106 10.98 Crab Nebula 0.438 6.67 Cyg X-3 0.033 13.37 GRS 1915+105 0.031 14.12 Significance 3.82s * 10-11 TeV cm-2 s-1

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) 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