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Hemispheric Handedness in the Galactic Synchrotron Polarization Foreground

Brandenburg, Axel ; Brüggen, Marcus

Astrophysical journal. Letters, 2020-06, Vol.896 (1), p.L14 [Periódico revisado por pares]

Austin: The American Astronomical Society

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  • Título:
    Hemispheric Handedness in the Galactic Synchrotron Polarization Foreground
  • Autor: Brandenburg, Axel ; Brüggen, Marcus
  • Assuntos: Anisotropy ; Differential rotation ; Dynamo theory ; Galaxy magnetic fields ; Handedness ; Hemispheres ; Linear polarization ; Magnetic fields ; Microwave Anisotropy Probe ; Milky Way ; Parity ; Polarization ; Qualitative analysis
  • É parte de: Astrophysical journal. Letters, 2020-06, Vol.896 (1), p.L14
  • Notas: AAS23678
  • Descrição: The large-scale magnetic field of the Milky Way is thought to be created by an dynamo, which implies that it should have opposite handedness north and south of the Galactic midplane. Here we attempt to detect a variation in handedness using polarization data from the Wilkinson Microwave Anisotropy Probe. Previous analyzes of the parity-even and parity-odd parts of linear polarization of the global dust and synchrotron emission have focused on quadratic correlations in spectral space of, and between, these two components. Here, by contrast, we analyze the parity-odd polarization itself and show that it has, on average, opposite signs in northern and southern Galactic hemispheres. Comparison with a Galactic mean-field dynamo model shows broad qualitative agreement and reveals that the sign of the observed hemispheric dependence of the azimuthally averaged parity-odd polarization is not determined by the sign of , but by the sense of differential rotation.
  • Editor: Austin: The American Astronomical Society
  • Idioma: Inglês
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