2012ApJ...757...26A

Query : 2012ApJ...757...26A

2012ApJ...757...26A - Astrophys. J., 757, 26 (2012/September-3)

Search for anisotropy of ultrahigh energy cosmic rays with the telescope array experiment.

ABU-ZAYYAD T., AIDA R., ALLEN M., ANDERSON R., AZUMA R., BARCIKOWSKI E., BELZ J.W., BERGMAN D.R., BLAKE S.A., CADY R., CHEON B.G., CHIBA J., CHIKAWA M., CHO E.J., CHO W.R., FUJII H., FUJII T., FUKUDA T., FUKUSHIMA M., HANLON W., HAYASHI K., HAYASHI Y., HAYASHIDA N., HIBINO K., HIYAMA K., HONDA K., IGUCHI T., IKEDA D., IKUTA K., INOUE N., ISHII T., ISHIMORI R., IVANOV D., IWAMOTO S., JUI C.C.H., KADOTA K., KAKIMOTO F., KALASHEV O., KANBE T., KASAHARA K., KAWAI H., KAWAKAMI S., KAWANA S., KIDO E., KIM H.B., KIM H.K., KIM J.H., KITAMOTO K., KITAMURA S., KITAMURA Y., KOBAYASHI K., KOBAYASHI Y., KONDO Y., KURAMOTO K., KUZMIN V., KWON Y.J., LIM S.I., MACHIDA S., MARTENS K., MARTINEAU J., MATSUDA T., MATSUURA T., MATSUYAMA T., MATTHEWS J.N., MINAMINO M., MIYATA K., MURANO Y., MYERS I., NAGASAWA K., NAGATAKI S., NAKAMURA T., NAM S.W., NONAKA T., OGIO S., OHNISHI M., OHOKA H., OKI K., OKU D., OKUDA T., OSHIMA A., OZAWA S., PARK I.H., PSHIRKOV M.S., RODRIGUEZ D.C., ROH S.Y., RUBTSOV G., RYU D., SAGAWA H., SAKURAI N., SAMPSON A.L., SCOTT L.M., SHAH P.D., SHIBATA F., SHIBATA T., SHIMODAIRA H., SHIN B.K., SHIN J.I., SHIRAHAMA T., SMITH J.D., SOKOLSKY P., SONLEY T.J., SPRINGER R.W., STOKES B.T., STRATTON S.R., STROMAN T., SUZUKI S., TAKAHASHI Y., TAKEDA M., TAKETA A., TAKITA M., TAMEDA Y., TANAKA H., TANAKA K., TANAKA M., THOMAS S.B., THOMSON G.B., TINYAKOV P., TKACHEV I., TOKUNO H., TOMIDA T., TROITSKY S., TSUNESADA Y., TSUTSUMI K., TSUYUGUCHI Y., UCHIHORI Y., UDO S., UKAI H., VASILOFF G., WADA Y., WONG T., WOOD M., YAMAKAWA Y., YAMANE R., YAMAOKA H., YAMAZAKI K., YANG J., YONEDA Y., YOSHIDA S., YOSHII H., ZHOU X., ZOLLINGER R. and ZUNDEL Z.

Abstract (from CDS):

We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by the Telescope Array (TA) detector in the first 40 months of operation. Following earlier studies, we examine event sets with energy thresholds of 10 EeV, 40 EeV, and 57 EeV. We find that the distributions of the events in right ascension and declination are compatible with an isotropic distribution in all three sets. We then compare with previously reported clustering of the UHECR events at small angular scales. No significant clustering is found in the TA data. We then check the events with E > 57 EeV for correlations with nearby active galactic nuclei. No significant correlation is found. Finally, we examine all three sets for correlations with the large-scale structure (LSS) of the universe. We find that the two higher-energy sets are compatible with both an isotropic distribution and the hypothesis that UHECR sources follow the matter distribution of the universe (the LSS hypothesis), while the event set with E > 10 EeV is compatible with isotropy and is not compatible with the LSS hypothesis at 95% CL unless large deflection angles are also assumed. We show that accounting for UHECR deflections in a realistic model of the Galactic magnetic field can make this set compatible with the LSS hypothesis.

Abstract Copyright: ∼

Journal keyword(s): acceleration of particles - astroparticle physics - cosmic rays - magnetic fields - methods: statistical - relativistic processes

Simbad objects: 13

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Number of rows : 13
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Psc-Per Supercluster SCG 02 33.2 +41 37           ~ 444 1
3 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
4 NAME Eridanus ClG GrG 03 38 32.00 -22 18 51.0           ~ 200 0
5 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
6 NAME UMa Region reg 11 00 +50.0           ~ 333 0
7 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
8 NAME Virgo Region reg 12 30.8 +12 23           ~ 140 1
9 NAME Norma Supercluster ClG 12 49 -38.0           ~ 24 0
10 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
12 NAME Pav-Ind GrG 21 53.4 -05 40           ~ 28 0
13 NAME CENTAURUS SUPERCL SCG ~ ~           ~ 30 0

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