2011ApJ...740...16A


Query : 2011ApJ...740...16A

2011ApJ...740...16A - Astrophys. J., 740, 16 (2011/October-2)

Observation of anisotropy in the arrival directions of galactic cosmic rays at multiple angular scales with IceCube.

ABBASI R., ABDOU Y., ABU-ZAYYAD T., ADAMS J., AGUILAR J.A., AHLERS M., ALTMANN D., ANDEEN K., AUFFENBERG J., BAI X., BAKER M., BARWICK S.W., BAY R., BAZO ALBA J.L., BEATTIE K., BEATTY J.J., BECHET S., BECKER J.K., BECKER K.-H., BENABDERRAHMANE M.L., BENZVI S., BERDERMANN J., BERGHAUS P., BERLEY D., BERNARDINI E., BERTRAND D., BESSON D.Z., BINDIG D., BISSOK M., BLAUFUSS E., BLUMENTHAL J., BOERSMA D.J., BOHM C., BOSE D., BOSER S., BOTNER O., BROWN A.M., BUITINK S., CABALLERO-MORA K.S., CARSON M., CHIRKIN D., CHRISTY B., CLEM J., CLEVERMANN F., COHEN S., COLNARD C., COWEN D.F., D'AGOSTINO M.V., DANNINGER M., DAUGHHETEE J., DAVIS J.C., DE CLERCQ C., DEMIRORS L., DENGER T., DEPAEPE O., DESCAMPS F., DESIATI P., DE VRIES-UITERWEERD G., DEYOUNG T., DIAZ-VELEZ J.C., DIERCKXSENS M., DREYER J., DUMM J.P., EHRLICH R., EISCH J., ELLSWORTH R.W., ENGDEGARD O., EULER S., EVENSON P.A., FADIRAN O., FAZELY A.R., FEDYNITCH A., FEINTZEIG J., FEUSELS T., FILIMONOV K., FINLEY C., FISCHER-WASELS T., FOERSTER M.M., FOX B.D., FRANCKOWIAK A., FRANKE R., GAISSER T.K., GALLAGHER J., GERHARDT L., GLADSTONE L., GLUSENKAMP T., GOLDSCHMIDT A., GOODMAN J.A., GORA D., GRANT D., GRIESEL T., GROSS A., GRULLON S., GURTNER M., HA C., HAJISMAIL A., HALLGREN A., HALZEN F., HAN K., HANSON K., HEINEN D., HELBING K., HERQUET P., HICKFORD S., HILL G.C., HOFFMAN K.D., HOMEIER A., HOSHINA K., HUBERT D., HUELSNITZ W., HULSS J.-P., HULTH P.O., HULTQVIST K., HUSSAIN S., ISHIHARA A., JACOBSEN J., JAPARIDZE G.S., JOHANSSON H., JOSEPH J.M., KAMPERT K.-H., KAPPES A., KARG T., KARLE A., KENNY P., KIRYLUK J., KISLAT F., KLEIN S.R., KOHNE J.-H., KOHNEN G., KOLANOSKI H., KOPKE L., KOPPER S., KOSKINEN D.J., KOWALSKI M., KOWARIK T., KRASBERG M., KRINGS T., KROLL G., KURAHASHI N., KUWABARA T., LABARE M., LAFEBRE S., LAIHEM K., LANDSMAN H., LARSON M.J., LAUER R., LUNEMANN J., MADAJCZYK B., MADSEN J., MAJUMDAR P., MAROTTA A., MARUYAMA R., MASE K., MATIS H.S., MEAGHER K., MERCK M., MESZAROS P., MEURES T., MIDDELL E., MILKE N., MILLER J., MONTARULI T., MORSE R., MOVIT S.M., NAHNHAUER R., NAM J.W., NAUMANN U., NIESSEN P., NYGREN D.R., ODROWSKI S., OLIVAS A., OLIVO M., O'MURCHADHA A., ONO M., PANKNIN S., PAUL L., PEREZ DE LOS HEROS C., PETROVIC J., PIEGSA A., PIELOTH D., PORRATA R., POSSELT J., PRICE C.C., PRICE P.B., PRZYBYLSKI G.T., RAWLINS K., REDL P., RESCONI E., RHODE W., RIBORDY M., RIZZO A., RODRIGUES J.P., ROTH P., ROTHMAIER F., ROTT C., RUHE T., RUTLEDGE D., RUZYBAYEV B., RYCKBOSCH D., SANDER H.-G., SANTANDER M., SARKAR S., SCHATTO K., SCHMIDT T., SCHONWALD A., SCHUKRAFT A., SCHULTES A., SCHULZ O., SCHUNCK M., SECKEL D., SEMBURG B., SEO S.H., SESTAYO Y., SEUNARINE S., SILVESTRI A., SLIPAK A., SPICZAK G.M., SPIERING C., STAMATIKOS M., STANEV T., STEPHENS G., STEZELBERGER T., STOKSTAD R.G., STOSSL A., STOYANOV S., STRAHLER E.A., STRASZHEIM T., STUR M., SULLIVAN G.W., SWILLENS Q., TAAVOLA H., TABOADA I., TAMBURRO A., TEPE A., TER-ANTONYAN S., TILAV S., TOALE P.A., TOSCANO S., TOSI D., TURCAN D., VAN EIJNDHOVEN N., VANDENBROUCKE J., VAN OVERLOOP A., VAN SANTEN J., VEHRING M., VOGE M., WALCK C., WALDENMAIER T., WALLRAFF M., WALTER M., WEAVER Ch., WENDT C., WESTERHOFF S., WHITEHORN N., WIEBE K., WIEBUSCH C.H., WILLIAMS D.R., WISCHNEWSKI R., WISSING H., WOLF M., WOOD T.R., WOSCHNAGG K., XU C., XU X.W., YODH G., YOSHIDA S., ZARZHITSKY P., ZOLL M. (The IceCube Collaboration)

Abstract (from CDS):

Between 2009 May and 2010 May, the IceCube neutrino detector at the South Pole recorded 32 billion muons generated in air showers produced by cosmic rays with a median energy of 20 TeV. With a data set of this size, it is possible to probe the southern sky for per-mil anisotropy on all angular scales in the arrival direction distribution of cosmic rays. Applying a power spectrum analysis to the relative intensity map of the cosmic ray flux in the southern hemisphere, we show that the arrival direction distribution is not isotropic, but shows significant structure on several angular scales. In addition to previously reported large-scale structure in the form of a strong dipole and quadrupole, the data show small-scale structure on scales between 15° and 30°. The skymap exhibits several localized regions of significant excess and deficit in cosmic ray intensity. The relative intensity of the smaller-scale structures is about a factor of five weaker than that of the dipole and quadrupole structure. The most significant structure, an excess localized at (right ascension α = 122°.4 and declination δ = -47°.4), extends over at least 20° in right ascension and has a post-trials significance of 5.3σ. The origin of this anisotropy is still unknown.

Abstract Copyright: ∼

Journal keyword(s): astroparticle physics - cosmic rays

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 IC 22 GiG 00 29 33.1738853496 -09 04 50.614065696   15   13.99   ~ 21 0
2 IC 40 GiG 00 39 21.4250874312 +02 27 22.359006324   15.1       ~ 23 0
3 IC 59 RNe 00 57 42.40 +61 04 59.8           ~ 41 1
4 NAME Vela SNR 08 34.0 -45 50           ~ 1331 2
5 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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