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Understanding the multiwavelength observation of Geminga's TeV halo: the role of anisotropic diffusion of particles

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arxiv 1904.11536 v2 pith:QQVNIQEC submitted 2019-04-25 astro-ph.HE

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keywords gemingadiffusionanisotropicfieldmagneticvicinityalignedapproximately
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abstract

In this letter we propose that the X-ray and the TeV observations in the vicinity of Geminga can be understood in the framework of anisotropic diffusion of injected electrons/positrons. This interpretation only requires the turbulence in the vicinity of Geminga to be sub-Alfv\'enic with the local mean magnetic field direction approximately aligned with our line of sight towards Geminga, without invoking extreme conditions for the environment, such as an extremely small diffusion coefficient and a weak magnetic field of strength $<1\mu$G as suggested in previous literature.

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    A three-component cosmic-ray model that includes the local interstellar cloud's motion and magnetic field reproduces the energy-dependent dipole anisotropy of cosmic rays from GeV to PeV energies, but with many fitted...

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