14–24 Jul 2025
CICG - International Conference Centre - Geneva, Switzerland
Europe/Zurich timezone
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Observation of medium-scale anisotropy of very high-energy cosmic rays with LHAASO-KM2A

15 Jul 2025, 16:35
15m
CICG - International Conference Centre - Geneva, Switzerland

CICG - International Conference Centre - Geneva, Switzerland

17 rue de Varembé CH - 1211 Geneva Switzerland
Talk Cosmic-Ray Indirect CRI

Speaker

Dr Shiping Zhao (Purple Mountain Observatory)

Description

The intensity of Galactic cosmic rays in the arrival directions is highly isotropic, however, many cosmic ray experiments have observed weak anisotropies of various angular sizes. In this work, we report the observation of the medium-scale structures with the square kilometer array of the Large High Altitude Air Shower Observatory (LHAASO-KM2A). We have found that the positions of the excess regions, located at $\alpha\sim320^{\circ}, \delta\sim30^{\circ}$ (around 17 TeV), and $\alpha\sim120^{\circ}, \delta\sim40^{\circ}$, provide compelling evidence of energy dependence within the energy range of 10 TeV to over 100 TeV. Furthermore, the evolution behaviors of energy dependence may indicate that local complex turbulent environments play a potential role in the propagation of cosmic rays, which offers a new perspective on their origin and transport of cosmic rays.

Collaboration(s) The LHAASO Collaboration

Author

Jiayin He

Co-authors

Prof. Yi Zhang (Purple Mountain Observatory) Dr Shiping Zhao (Purple Mountain Observatory) Prof. Qiang Yuan (Purple Mountain Observatory)

Presentation materials

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