Evidence of intermediate-scale energy spectrum anisotropy of cosmic rays E [geq] 10[sup](19.2) eV with the Telescope Array surface detector

Abstract

Evidence of an intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high energy cosmic rays of energies above 10^19.2 eV in the northern hemisphere, using 7 years of Telescope Array (TA) surface detector (SD) data. A relative energy distribution test is done comparing events inside oversampled spherical caps of equal exposure, to those outside, using the Poisson likelihood ratio. The center of maximum significance is at 139 R.A., 45 Dec., and has a deficit of events with energies 10^19.210^19.75 eV. The post-trial probability of this energy anisotropy, appearing by chance anywhere on an isotropic sky, is found by Monte Carlo (MC) simulation to be 9x10^-5 (3.74 σ_global).

Keywords

cosmic rays;UHECR;energy spectrum;anisotropy;

Data

Language:	English
Year of publishing:	2018
Typology:	1.12 - Published Scientific Conference Contribution Abstract
Organization:	UNG - University of Nova Gorica
UDC:	52
COBISS:	13026307
ISSN:	Y507-6323
Views:	2033
Downloads:	79
Average score:	0 (0 votes)
Metadata:

Other data

URN:	URN:SI:UNG
Type (COBISS):	Not categorized
Pages:	1 str.
Volume:	ǂVol. ǂ63
Issue:	ǂno. ǂ4
Chronology:	2018
ID:	11600774