IceCube 40Point Source AnalysisResultsConclusions Search for neutrino point sources with the IceCube Neutrino Observatory Menlo Park, California TeVPA.

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Presentation transcript:

IceCube 40Point Source AnalysisResultsConclusions Search for neutrino point sources with the IceCube Neutrino Observatory Menlo Park, California TeVPA 2009

2 Juan A. Aguilar IceCube 40Point Source AnalysisResultsConclusions IceCube 59 (2009) IceCube 40 (2008-9) IceCube currently running with 59 strings deployed IC-40 has approx. 2 x effective area of the previous IC-22 First half (~6 months) of IC40 data has been analyzed for point sources. Completion with 80 (+ 6) strings by January 2011 IceCube 80

Juan A. Aguilar 3 IceCube 40: More fully contained strings than in IC22. Short direction: angular resolution comparable to IceCube 22. Long direction: angular resolution comparable to full IceCube 80 configuration. Long Direction Short Direction IceCube 40Point Source AnalysisResultsConclusions Top view

IceCube 40Point Source AnalysisResultsConclusions 4 Juan A. Aguilar Cumulative distribution of the Point Spread Function for different IceCube configurations. The main improvement wrt to the IC22 configuration is the different track reconstruction algorithm. 50% angular resolution

IceCube 40Point Source AnalysisResultsConclusions 5 Juan A. Aguilar Solid-angle averaged neutrino effective area for reconstructed events in 2 degrees. South Pole

6 Preliminary IceCube 40Point Source AnalysisResultsConclusions Factor of 1.1in sensitivity Factor of 1.5 in discovery potential - A comparison to the IC22 point source analysis - IC40 with only 6 months is already a slight improvement over IC22

7 Juan A. Aguilar Signal pdf: Background pdf: Likelihood ratio: A final significance is evaluated by scrambling the data in r.a. and repeating the analysis. IceCube 40Point Source AnalysisResultsConclusions Likelihood: Taken from real data.

Juan A. Aguilar 8 IceCube 40Point Source AnalysisResultsConclusions

IceCube 40Point Source AnalysisResultsConclusions Atmospheric Neutrinos Downgoing muons 9 Juan A. Aguilar  Northern sky (upgoing events): Earth is used as a filter for atmospheric muons. Atmospheric neutrinos-induced muons upgoing events. Quality cuts reject the misreconstructed muon background. PS search is sensitive over a large range in energy, >~TeV  Southern sky (downgoing events): Large amount of downgoing atmospheric muons background. Cuts based on energy cuts to reject muon background. PS search is primarily sensitive to a neutrino signals >~PeV Flux of atmospheric muons and neutrinos at a depth of IceCube: Southern Sky Northern Sky

Juan A. Aguilar 10 Final cut level IceCube 40Point Source AnalysisResultsConclusions A rate of 929 Hz at trigger level mainly due to atmospheric muons. After the final cut level events remain in the sample:  6796 in the Northern sky (Zenith > 90°)  in the Southern sky (Zenith < 90°) Trigger level

Juan A. Aguilar 11 IceCube 40Point Source AnalysisResultsConclusions The Southern sky (downgoing events) has a better angular resolution due to the strong cut requirement. Also the energy range of downgoing events (mostly atmospheric muons) is higher than the energy range of upgoing atmospheric neutrinos. Southern skyNorthern sky

Juan A. Aguilar string Differential 5  Discovery Potentials Northern Sky  = +6°  = +30°  = +60° Arbitrary Scaling (E 2 d ϕ /dE) IceCube 40Point Source AnalysisResultsConclusions Northern sky

Juan A. Aguilar string Differential 5  Discovery Potentials Northern and Southern Sky  = +6°  = +60°  = -8°  = -30°  = -60° Arbitrary Scaling (E 2 d ϕ /dE) IceCube 40Point Source AnalysisResultsConclusions  = +30° Southern skyNorthern sky

Paper accepted by ApJL Juan A. Aguilar 14 IceCube 40Point Source AnalysisResultsConclusions 24h +30° +15° +45° +60° +75° -log 10 p Atm. neutrinos Last year: 22-string all-sky results

0h 24h +30° +15° +45° +60° +75° -15° -30° -45° -log 10 p Last year: 22-string all-sky results Analysis extended to -50° dec R. Lauer, Heidelberg Workshop, Jan09 arXiv: First IceCube search for point sources above the horizon optimized for higher energies Atm. neutrinos Atm. muons Juan A. Aguilar 15 IceCube 40Point Source AnalysisResultsConclusions

IceCube 40Point Source AnalysisResultsConclusions 16 Juan A. Aguilar Atm. neutrinos Atm. muons

IceCube 40Point Source AnalysisResultsConclusions 17 Juan A. Aguilar Hottest location in the all-sky search is: r.a.=114.95°, dec.=15.35° Pre-trial -log 10 (p-value) = 4.43 Atm. neutrinos Atm. muons

Juan A. Aguilar 18 IceCube 40Point Source AnalysisResultsConclusions The distribution of results for 1000 scrambled skymaps. 611 out of 1000 scrambled experiments had a p-value lower than that of the data (61%). All-sky p-value = 61% Number of trials

Juan A. Aguilar 19 IceCube 40Point Source AnalysisResultsConclusions The distribution of results for 1000 scrambled skymaps. 611 out of 1000 scrambled experiments had a p-value lower than that of the data (61%). All-sky p-value = 61% Number of trials No excess found!

Juan A. Aguilar 20 Source Name Cyg_OB2 MGRO_J MGRO_J Cas_A IC443 Geminga Crab_Nebula 1ES_ ES_ C66A H_ BL_Lac Mrk_501 Mrk_421 W_Comae 1ES_ M87 S5_ M82 3C_ C_ C_38.41 PKS_ PKS_ PKS_ C_273 NGC_1275 Cyg_A IC-22_maximum Ra, Dec (deg) ( ,41.510): ( ,36.830): ( , 6.269): ( ,58.815): ( ,22.529): ( ,17.770): ( ,22.014): ( ,65.149): ( , ): ( ,43.043): ( ,42.672): ( ,42.278): ( ,39.760): ( ,38.209): ( ,28.233): ( ,20.287): ( ,12.391): ( ,71.343): ( ,69.680): ( ,29.671): ( ,16.148): ( ,38.135): ( ,16.620): ( ,13.532): ( ,10.494): ( ,2.052): ( ,41.512): ( ,40.734): ( ,11.375): p-value Northern Sky Sources: 22-string hottest spot is now a under-fluctuation IceCube 40Point Source AnalysisResultsConclusions P-values ≥ 0.5 (under- fluctuations) are given as “---” Probability of 27 under- fluctuations in 39 sources is 10%

21 Source Name Sgr_A* PKS_ Cen_A PKS_ PKS_ PKS_ QSO_ PKS_ QSO_ C279 Ra, Dec (deg) ( , ) : ( , ) : ( , ) : ( , ) : ( , ) : ( , ) : ( ,-13.08): ( ,-7.874): ( ,-7.640): ( ,-5.790): p-value Highest significance from list of 39 sources comes from PKS  Pretrial p-value of 5.2% or less for any of the 39 sources happens in 618/1000 scrambled skymaps  Source list final p-value is 62%, not significant Jon Dumm, ICRC 2009 IceCube 40Point Source AnalysisResultsConclusions p-value = 62% Southern Sky Sources: Number of trials

22 Source Name Sgr_A* PKS_ Cen_A PKS_ PKS_ PKS_ QSO_ PKS_ QSO_ C279 Ra, Dec (deg) ( , ) : ( , ) : ( , ) : ( , ) : ( , ) : ( , ) : ( ,-13.08): ( ,-7.874): ( ,-7.640): ( ,-5.790): p-value Highest significance from list of 39 sources comes from PKS  Pretrial p-value of 5.2% or less for any of the 39 sources happens in 618/1000 scrambled skymaps  Source list final p-value is 62%, not significant Jon Dumm, ICRC 2009 IceCube 40Point Source AnalysisResultsConclusions p-value = 62% Southern Sky Sources: Number of trials No excess found!

Juan A. Aguilar 23 IceCube 40Point Source AnalysisResultsConclusions  Cosmic rays blocked by the moon lead to a point-like deficit in the distribution of down-going muons in the detector.  Moon shadow observed as a deficit in CR muon rate using 8 months of IC40 data.  Deficit of 5σ (~900 events of ~28000) consistent with expectation.  Important verification of angular resolution and absolute pointing. Lee & Ma significance

Juan A. Aguilar 24 IceCube 40Point Source AnalysisResultsConclusions  Cosmic rays blocked by the moon lead to a point-like deficit in the distribution of down-going muons in the detector.  Moon shadow observed as a deficit in CR muon rate using 8 months of IC40 data.  Deficit of 5σ (~900 events of ~28000) consistent with expectation.  Important verification of angular resolution and absolute pointing. Lee & Ma significance

Juan A. Aguilar 25 IceCube 40Point Source AnalysisResultsConclusions

Juan A. Aguilar 26

27 Juan A. Aguilar MGRO J at dec = +0.5° E -2 up to 40 TeV Gonzalez-Garcia, Halzen, Mohapatra, arXiv: discovery x 21, exclusion x 6 IceCube 40Point Source AnalysisResultsConclusions Preliminary

28 - There will still be a substantial improvement when the remainder of the 40-string dataset is added Preliminary

Juan A. Aguilar 29

AMANDA-II 7 yr arXiv: string Discovery Potential: 5σ in 50% of trials 40-string Sensitivity: Flux excluded at 90%cl ANTARES IC22 SK MACRO 80-string Sensitivity: Based on 40-string analysis Preliminary 30 Juan A. Aguilar IceCube 40Point Source AnalysisResultsConclusions

IceCube 40Point Source AnalysisResultsConclusions 31 Juan A. Aguilar Solid-angle averaged neutrino effective area for reconstructed events in 2 degrees.

Juan A. Aguilar 32