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Area of Science:

  • Astrophysics
  • High-energy astrophysics
  • Cosmic ray physics

Background:

  • Extended gamma-ray sources are typically modeled with symmetric cosmic ray diffusion.
  • Recent observations show multiple sources near pulsars and significant offsets between TeV halo centroids and their parent pulsars.
  • The assumption of symmetric diffusion may be an oversimplification.

Purpose of the Study:

  • To investigate the impact of asymmetric cosmic ray propagation on the morphology of extended gamma-ray sources.
  • To explain the observed multiple sources and large offsets near pulsars.
  • To provide an alternative interpretation for perplexing detected sources without invoking new physics.

Main Methods:

  • Theoretical modeling of cosmic ray propagation.
  • Simulations of asymmetric diffusion from pulsar accelerators.
  • Comparison of model predictions with observational data of TeV halos.

Main Results:

  • Asymmetric cosmic ray propagation naturally produces multiple TeV sources instead of a single symmetric one.
  • This mechanism explains the significant offsets observed between TeV halo centroids and their parent pulsars.
  • Several previously perplexing sources are explained without requiring additional invisible accelerators.

Conclusions:

  • Cosmic ray diffusion is not always symmetric, especially near accelerators like pulsars.
  • Asymmetric propagation is a viable mechanism to explain complex gamma-ray source distributions.
  • This finding simplifies the interpretation of observed TeV halos and their parent pulsars.