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arxiv: 1409.3128 · v1 · submitted 2014-09-10 · 🌌 astro-ph.HE · astro-ph.IM

Recognition: unknown

Searches for Large-Scale Anisotropy in the Arrival Directions of Cosmic Rays Detected above Energy of 10¹⁹ eV at the Pierre Auger Observatory and the Telescope Array

The Pierre Auger , Telescope Array Collaborations: A.Aab , P.Abreu , M.Aglietta , E.J.Ahn , I.Al Samarai , I.F.M.Albuquerque , I.Allekotte
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J.Allen P.Allison A.Almela J.Alvarez Castillo J.Alvarez-Mu\~niz R.Alves Batista M.Ambrosio A.Aminaei L.Anchordoqui S.Andringa C.Aramo F.Arqueros H.Asorey P.Assis J.Aublin M.Ave M.Avenier G.Avila A.M.Badescu K.B.Barber J.B\"auml C.Baus J.J.Beatty K.H.Becker J.A.Bellido C.Berat X.Bertou P.L.Biermann P.Billoir M.Blanco C.Bleve H.Bl\"umer M.Boh\'a\v{c}ov\'a D.Boncioli C.Bonifazi R.Bonino N.Borodai J.Brack I.Brancus P.Brogueira W.C.Brown P.Buchholz A.Bueno S.Buitink M.Buscemi K.S.Caballero-Mora B.Caccianiga L.Caccianiga M.Candusso L.Caramete R.Caruso A.Castellina G.Cataldi L.Cazon R.Cester A.G.Chavez A.Chiavassa J.A.Chinellato J.Chudoba M.Cilmo R.W.Clay G.Cocciolo R.Colalillo A.Coleman L.Collica M.R.Coluccia R.Concei\c{c}\~ao F.Contreras M.J.Cooper A.Cordier S.Coutu C.E.Covault J.Cronin A.Curutiu R.Dallier B.Daniel S.Dasso K.Daumiller B.R.Dawson R.M.de Almeida M.De Domenico S.J.de Jong J.R.T.de Mello Neto I.De Mitri J.de Oliveira V.de Souza L.del Peral O.Deligny H.Dembinski N.Dhital C.Di Giulio A.Di Matteo J.C.Diaz M.L.D\'iaz Castro F.Diogo C.Dobrigkeit W.Docters J.C.D'Olivo A.Dorofeev Q.Dorosti Hasankiadeh M.T.Dova J.Ebr R.Engel M.Erdmann M.Erfani C.O.Escobar J.Espadanal A.Etchegoyen P.Facal San Luis H.Falcke K.Fang G.Farrar A.C.Fauth N.Fazzini A.P.Ferguson M.Fernandes B.Fick J.M.Figueira A.Filevich A.Filip\v{c}i\v{c} B.D.Fox O.Fratu U.Fr\"ohlich B.Fuchs T.Fuji R.Gaior B.Garc\'ia S.T.Garcia Roca D.Garcia-Gamez D.Garcia-Pinto G.Garilli A.Gascon Bravo F.Gate H.Gemmeke P.L.Ghia U.Giaccari M.Giammarchi M.Giller C.Glaser H.Glass M.G\'omez Berisso P.F.G\'omez Vitale P.Gon\c{c}alves J.G.Gonzalez N.Gonz\'alez B.Gookin A.Gorgi P.Gorham P.Gouffon S.Grebe N.Griffith A.F.Grillo T.D.Grubb Y.Guardincerri F.Guarino G.P.Guedes M.R.Hampel P.Hansen D.Harari T.A.Harrison S.Hartmann J.L.Harton A.Haungs T.Hebbeker D.Heck P.Heimann A.E.Herve G.C.Hill C.Hojvat N.Hollon E.Holt P.Homola J.R.H\"orandel P.Horvath M.Hrabovsk\'y D.Huber T.Huege A.Insolia P.G.Isar K.Islo I.Jandt S.Jansen C.Jarne M.Josebachuili A.K\"a\"ap\"a O.Kambeitz K.H.Kampert P.Kasper I.Katkov B.K\'egl B.Keilhauer A.Keivani E.Kemp R.M.Kieckhafer H.O.Klages M.Kleifges J.Kleinfeller R.Krause N.Krohm O.Kr\"omer D.Kruppke-Hansen D.Kuempel N.Kunka G.La Rosa D.LaHurd L.Latronico R.Lauer M.Lauscher P.Lautridou S.Le Coz M.S.A.B.Le\~ao D.Lebrun P.Lebrun M.A.Leigui de Oliveira A.Letessier-Selvon I.Lhenry-Yvon K.Link R.L\'opez A.Lopez Ag\"uera K.Louedec J.Lozano Bahilo L.Lu A.Lucero M.Ludwig M.C.Maccarone M.Malacari S.Maldera M.Mallamaci J.Maller D.Mandat P.Mantsch A.G.Mariazzi V.Marin I.C.Mari\c{s} G.Marsella D.Martello L.Martin H.Martinez O.Mart\'inez Bravo D.Martraire J.J.Mas\'ias Meza H.J.Mathes S.Mathys J.A.J.Matthews J.Matthews G.Matthiae D.Maurel D.Maurizio E.Mayotte P.O.Mazur C.Medina G.Medina-Tanco M.Melissas D.Melo E.Menichetti A.Menshikov S.Messina R.Meyhandan S.Mi\'canovi\'c M.I.Micheletti L.Middendorf I.A.Minaya L.Miramonti B.Mitrica L.Molina-Bueno S.Mollerach M.Monasor D.Monnier Ragaigne F.Montanet C.Morello M.Mostaf\'a C.A.Moura M.A.Muller G.M\"uller M.M\"unchmeyer R.Mussa G.Navarra S.Navas P.Necesal L.Nellen A.Nelles J.Neuser M.Niechciol L.Niemietz T.Niggemann D.Nitz D.Nosek V.Novotny L.No\v{z}ka L.Ochilo A.Olinto M.Oliveira N.Pacheco D.Pakk Selmi-Dei M.Palatka J.Pallotta N.Palmieri P.Papenbreer G.Parente A.Parra T.Paul M.Pech J.Pekala R.Pelayo I.M.Pepe L.Perrone R.Pesce E.Petermann C.Peters S.Petrera A.Petrolini Y.Petrov J.Phuntsok R.Piegaia T.Pierog P.Pieroni M.Pimenta V.Pirronello M.Platino M.Plum A.Porcelli C.Porowski R.R.Prado P.Privitera M.Prouza V.Purrello E.J.Quel S.Querchfeld S.Quinn J.Rautenberg O.Ravel D.Ravignani B.Revenu J.Ridky S.Riggi M.Risse P.Ristori V.Rizi J.Roberts W.Rodrigues de Carvalho I.Rodriguez Cabo G.Rodriguez Fernandez J.Rodriguez Rojo M.D.Rodr\'iguez-Fr\'ias G.Ros J.Rosado T.Rossler M.Roth E.Roulet A.C.Rovero S.J.Saffi A.Saftoiu F.Salamida H.Salazar A.Saleh F.Salesa Greus G.Salina F.S\'anchez P.Sanchez-Lucas C.E.Santo E.Santos E.M.Santos F.Sarazin B.Sarkar R.Sarmento R.Sato N.Scharf V.Scherini H.Schieler P.Schiffer O.Scholten H.Schoorlemmer P.Schov\'anek A.Schulz J.Schulz J.Schumacher S.J.Sciutto A.Segreto M.Settimo A.Shadkam R.C.Shellard I.Sidelnik G.Sigl O.Sima A.\'Smia{\l} R.\v{S}m\'ida G.R.Snow P.Sommers J.Sorokin R.Squartini Y.N.Srivastava S.Stani\v{c} J.Stapleton J.Stasielak M.Stephan A.Stutz F.Suarez T.Suomij\"arvi A.D.Supanitsky M.S.Sutherland J.Swain Z.Szadkowski M.Szuba O.A.Taborda A.Tapia M.Tartare V.M.Theodoro C.Timmermans C.J.Todero Peixoto G.Toma L.Tomankova B.Tom\'e A.Tonachini G.Torralba Elipe D.Torres Machado P.Travnicek E.Trovato M.Tueros R.Ulrich M.Unger M.Urban J.F.Vald\'es Galicia I.Vali\~no L.Valore G.van Aar A.M.van den Berg S.van Velzen A.van Vliet E.Varela B.Vargas C\'ardenas G.Varner J.R.V\'azquez R.A.V\'azquez D.Veberi\v{c} V.Verzi J.Vicha M.Videla L.Villase\~nor B.Vlcek S.Vorobiov H.Wahlberg O.Wainberg D.Walz A.A.Watson M.Weber K.Weidenhaupt A.Weindl F.Werner A.Widom L.Wiencke B.Wilczy\'nska H.Wilczy\'nski M.Will C.Williams T.Winchen D.Wittkowski B.Wundheiler S.Wykes T.Yamamoto T.Yapici P.Younk G.Yuan A.Yushkov B.Zamorano E.Zas D.Zavrtanik M.Zavrtanik I.Zaw A.Zepeda J.Zhou Y.Zhu M.Zimbres Silva M.Ziolkowski R.U.Abbasi M.Abe T.Abu-Zayyad M.Allen R.Anderson R.Azuma E.Barcikowski J.W.Belz D.R.Bergman S.A.Blake R.Cady M.J.Chae B.G.Cheon J.Chiba M.Chikawa W.R.Cho T.Fujii M.Fukushima T.Goto W.Hanlon Y.Hayashi N.Hayashida K.Hibino K.Honda D.Ikeda N.Inoue T.Ishii R.Ishimori H.Ito D.Ivanov C.C.H.Jui K.Kadota F.Kakimoto O.Kalashev K.kasahara H.Kawai S.Kawakami S.Kawana K.Kawata E.Kido H.B.Kim J.H.Kim S.Kitamura Y.Kitamura V.Kuzmin Y.J.Kwon J.Lan S.I.Lim J.P.Lundquist K.Machida K.Martens T.Matsuda T.Matsuyama J.N.Matthews M.Minamino K.Mukai I.Myers K.Nagasawa S.Nagataki T.Nakamura T.Nonaka A.Nozato S.Ogio J.Ogura M.Ohnishi H.Ohoka K.Oki T.Okuda M.Ono A.Oshima S.Ozawa I.H.Park M.S.Pshirkov D.C.Rodriguez G.Rubtsov D.Ryu H.Sagawa N.Sakurai A.L.Sampson L.M.Scott P.D.Shah F.Shibata T.Shibata H.Shimodaira B.K.Shin J.D.Smith P.Sokolsky R.W.Springer B.T.Stokes S.R.Stratton T.A.Stroman T.Suzawa M.Takamura M.Takeda R.Takeishi A.Taketa M.Takita Y.Tameda H.Tanaka K.Tanaka M.Tanaka S.B.Thomas G.B.Thomson P.Tinyakov I.Tkachev H.Tokuno T.Tomida S.Troitsky Y.Tsunesada K.Tsutsumi Y.Uchihori S.Udo F.Urban G.Vasiloff T.Wong R.Yamane H.Yamaoka K.Yamazaki J.Yang K.Yashiro Y.Yoneda S.Yoshida H.Yoshii R.Zollinger Z.Zundel
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classification 🌌 astro-ph.HE astro-ph.IM
keywords cosmicraysaboveanisotropyarrayaugerdatadipole
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Spherical harmonic moments are well-suited for capturing anisotropy at any scale in the flux of cosmic rays. An unambiguous measurement of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the northern and southern hemispheres. To this end, a joint analysis using data recorded at the Telescope Array and the Pierre Auger Observatory above $10^{19}$ eV is presented in this work. The resulting multipolar expansion of the flux of cosmic rays allows us to perform a series of anisotropy searches, and in particular to report on the angular power spectrum of cosmic rays above $10^{19}$ eV. No significant deviation from isotropic expectations is found throughout the analyses performed. Upper limits on the amplitudes of the dipole and quadrupole moments are derived as a function of the direction in the sky, varying between 7% and 13% for the dipole and between 7% and 10% for a symmetric quadrupole.

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