2015ApJ...809...90B

Query : 2015ApJ...809...90B

2015ApJ...809...90B - Astrophys. J., 809, 90 (2015/August-8)

ARGO-YBJ observation of the large-scale cosmic ray anisotropy during the solar minimum between cycles 23 and 24.

BARTOLI B., BERNARDINI P., BI X.J., CAO Z., CATALANOTTI S., CHEN S.Z., CHEN T.L., CUI S.W., DAI B.Z., D'AMONE A., DANZENGLUOBU, DE MITRI I., D'ETTORRE PIAZZOLI B., DI GIROLAMO T., DI SCIASCIO G., FENG C.F., FENG Z., GAO W., GOU Q.B., GUO Y.Q., HE H.H., HU H., IACOVACCI M., IUPPA R., JIA H.Y., LABACIREN, LI H.J., LIU C., LIU J., LIU M.Y., LU H., MA L.L., MA X.H., MANCARELLA G., MARI S.M., MARSELLA G., MASTROIANNI S., MONTINI P., NING C.C., PERRONE L., PISTILLI P., SALVINI P., SANTONICO R., SHEN P.R., SHENG X.D., SHI F., SURDO A., TAN Y.H., VALLANIA P., VERNETTO S., VIGORITO C., WANG H., WU C.Y., WU H.R., XUE L., YANG Q.Y., YANG X.C., YAO Z.G., YUAN A.F., ZHA M., ZHANG H.M., ZHANG L., ZHANG X.Y., ZHANG Y., ZHAO J., ZHAXICIREN, ZHAXISANGZHU, ZHOU X.X., ZHU F.R., ZHU Q.Q. (The ARGO-YBJ Collaboration)

Abstract (from CDS):

This paper reports on the measurement of the large-scale anisotropy in the distribution of cosmic-ray arrival directions using the data collected by the air shower detector ARGO-YBJ from 2008 January to 2009 December, during the minimum of solar activity between cycles 23 and 24. In this period, more than 2 x 1011 showers were recorded with energies between ∼1 and 30 TeV. The observed two-dimensional distribution of cosmic rays is characterized by two wide regions of excess and deficit, respectively, both of relative intensity ∼10–3 with respect to a uniform flux, superimposed on smaller size structures. The harmonic analysis shows that the large-scale cosmic-ray relative intensity as a function of R.A. can be described by the first and second terms of a Fouries series. The high event statistics allow the study of the energy dependence of the anistropy, showing that the amplitude increases with energy, with a maximum intensity at ∼10 TeV, and then decreases while the phase slowly shifts toward lower values of R.A. with increasing energy. The ARGO-YBJ data provide accurate observations over more than a decade of energy around this feature of the anisotropy spectrum.

Abstract Copyright: © 2015. The American Astronomical Society. All rights reserved.

Journal keyword(s): cosmic rays - methods: data analysis - methods: observational

Simbad objects: 4

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Number of rows : 4
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 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 PSR J0633+1746 Psr 06 33 54.153 +17 46 12.91           ~ 1308 0
3 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
4 NAME Cyg Complex reg 20 32 +45.0           ~ 667 0

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