Observation of Anisotropy in the Galactic Cosmic-Ray Arrival Directions at 400 TeV with IceCube R Abbasi , Y Abdou , T Abuzayyad , M Ackermann , J Adams , J A Aguilar , M Ahlers , M M Allen , D Altmann , K Andeen , J Auffenberg , X Bai , M D Baker , S W Barwick , R Bay , J L Bazo Alba , K Beattie , J J Beatty , S Bechet , J K Becker , K H Becker , M L Benabderrahmane , S Benzvi , J Berdermann , P Berghaus , D Berley , E Bernardini , D Bertrand , D Besson , D Bindig , M Bissok , E Blaufuss , J Blumenthal , D J Boersma , Christian Bohm , D Bose , S Boeser , O Botner , A M Brown , S Buitink , K S Caballeromora , M Carson , D Chirkin , B Christy , F Clevermann , S A Cohen , C Colnard , D F Cowen , A H Cruz Silva , M V Dagostino , Matthias Danninger , J Daughhetee , J C Davis , C De Clercq , T Degner , L Demiroers , F Descamps , P Desiati , G De Vriesuiterweerd , T Deyoung , J C Diazvelez , M Dierckxsens , J Dreyer , J P Dumm , M Dunkman , J Eisch , R W Ellsworth , O Engdegard , S Euler , P A Evenson , O Fadiran , A R Fazely , A Fedynitch , J Feintzeig , T Feusels , K Filimonov , C Finley , T Fischerwasels , B D Fox , A Franckowiak , R Franke , T K Gaisser , J S Gallagher , L Gerhardt , L Gladstone , T Gluesenkamp , A Goldschmidt , J A Goodman , D Gora , David J W Grant , T Griesel , Anita Gross , S Grullon , M Gurtner , C Ha , A Haj Ismail , Allan Hallgren , F Halzen , Ke Han , K Hanson , D Heinen , K Helbing , R Hellauer , S Hickford , G Hill , K D Hoffman , B Hoffmann , A Homeier , K Hoshina , W Huelsnitz , J P Huelss , P O Hulth , K Hultqvist , S N Hussain , A Ishihara , E Jacobi , J Jacobsen , G S Japaridze , H Johansson , K H Kampert , A Kappes , T Karg , A Karle , Peter T M Kenny , J Kiryluk , F Kislat , S R Klein , J H Koehne , G Kohnen , H Kolanoski , L Koepke , S Kopper , D J Koskinen , M Kowalski , T Kowarik , M Krasberg , G Kroll , N Kurahashi , T Kuwabara , M Labare , K Laihem , H Landsman , M J Larson , R Lauer , J Luenemann , Jan Madsen , A Marotta , R Maruyama , K Mase , H S Matis , K Meagher , M Merck , P Meszaros , T Meures , S Miarecki , E Middell , N Milke , J S Miller , T Montaruli , Richard L D Morse , S M Movit , R Nahnhauer , J W Nam , U Naumann , D R Nygren , S Odrowski , A Olivas , Malini Olivo , Aongus Omurchadha , S Panknin , L Paul , Carlos Perez De Los Heros , J Petrovic , A Piegsa , D Pieloth , R Porrata , J Posselt , C Price , P B Price , G T Przybylski , K Rawlins , P Redl , E Resconi , W Rhode , M Ribordy , Michael Scott Richman , J P Rodrigues , F Rothmaier , C Rott , T Ruhe , David B Rutledge , B Ruzybayev , D Ryckbosch , H G Sander , M Santander , S Sarkar , K Schatto , Torsten C Schmidt , A Schoenwald , A Schukraft , A Schultes , O Schulz , M Schunck , D Seckel , B Semburg , S H Seo , Y Sestayo , S Seunarine , A Silvestri , G M Spiczak , C Spiering , M Stamatikos , T Stanev , T Stezelberger , R G Stokstad , A J Stoessl , E A Strahler , Rickard Strom , M Stueer , G W Sullivan , Q Swillens , H Taavola , I Taboada , A Tamburro , A Tepe , S Terantonyan , S Tilav , P A Toale , S Toscano , D Tosi , N Van Eijndhoven , J Vandenbroucke , A Van Overloop , J Van Santen , M Vehring , M Voge , C Walck , T Waldenmaier , M Wallraff , M Walter , Ch Weaver , C Wendt , S Westerhoff , N Whitehorn , K Wiebe , C H Wiebusch , D R Williams , R Wischnewski , H Wissing , Michael M Wolf , T R Wood , K Woschnagg , Changqing Xu , D L Xu , X W Xu , J P Yanez , G B Yodh , S Yoshida , P Zarzhitsky , M Zoll ASTROPHYSICAL JOURNAL（2012）
摘要
In this paper we report the first observation in the Southern hemisphere of an energy dependence in the Galactic cosmic-ray anisotropy up to a few hundred TeV. This measurement was performed using cosmic-ray-induced muons recorded by the partially deployed IceCube observatory between 2009 May and 2010 May. The data include a total of 33 x 10(9) muon events with a median angular resolution of similar to 3 degrees. A sky map of the relative intensity in arrival direction over the Southern celestial sky is presented for cosmic-ray median energies of 20 and 400 TeV. The same large-scale anisotropy observed at median energies around 20 TeV is not present at 400 TeV. Instead, the high-energy sky map shows a different anisotropy structure including a deficit with a post-trial significance of -6.3 sigma. This anisotropy reveals a new feature of the Galactic cosmic-ray distribution, which must be incorporated into theories of the origin and propagation of cosmic rays.
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astroparticle physics, cosmic rays, neutrinos
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