Large-scale Cosmic-Ray Anisotropy as a Probe of Interstellar Turbulence

被引：15
|
作者：
Giacinti, Gwenael [1 ]
Kirk, John G. [1 ]
机构：
[1] Max Planck Inst Kernphys, Postfach 103980, D-69029 Heidelberg, Germany
来源：
ASTROPHYSICAL JOURNAL | 2017年 / 835卷 / 02期
关键词：
cosmic rays; ISM: magnetic fields; BOUNDARY-EXPLORER RIBBON; GALACTIC MAGNETIC-FIELD; MAGNETOHYDRODYNAMIC TURBULENCE; ALFVENIC TURBULENCE; ARRIVAL DIRECTIONS; TEV; PROPAGATION; DIFFUSION; IBEX; SCATTERING;
D O I：
10.3847/1538-4357/835/2/258
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We calculate the large-scale cosmic-ray (CR) anisotropies predicted for a range of Goldreich-Sridhar (GS) and isotropic models of interstellar turbulence, and compare them with IceTop data. In general, the predicted CR anisotropy is not a pure dipole; the cold spots reported at 400 TeV and 2 PeV are consistent with a GS model that contains a smooth deficit of parallel-propagating waves and a broad resonance function, though some other possibilities cannot, as yet, be ruled out. In particular, isotropic fast magnetosonic wave turbulence can match the observations at high energy, but cannot accommodate an energy dependence in the shape of the CR anisotropy. Our findings suggest that improved data on the large-scale CR anisotropy could provide a valuable probe of the properties-notably the power-spectrum-of the interstellar turbulence within a few tens of parsecs from Earth.
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页数：19
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