Galactic Magnetic Turbulence from Radio data
arXiv:1101.5524 · doi:10.1016/j.astropartphys.2011.07.003
Abstract
Fluctuations in the Galactic synchrotron emission can be traced by the angular power spectrum of radio maps at low multipoles. At frequencies below few GHz, large-scale anisotropies are mainly induced by magnetic field turbulence. By performing an analysis of five radio maps, we extract constraints on turbulence spectral index and halo scale. Results favour a power spectrum significantly flatter than for 3D Kolmogorov-like turbulence, and a thin halo. This can be interpreted as an indication supporting non-conventional models of propagation of cosmic-ray particles in the Galaxy, or as a suggestion of a spectral-index break in the observed magnetic turbulence power spectrum.
15 pages, 3 figures. v2: discussions and references improved, to appear in Astropart.Phys.J
References in corpus (13)
- EMU: Evolutionary Map of the Universe
- Radio observational constraints on Galactic 3D-emission models
- The outer scale of turbulence in the magneto-ionized Galactic interstellar medium
- Data analysis recipes: Fitting a model to data
- All-sky Galactic radiation at 45 MHz and spectral index between 45 and 408 MHz
- Cosmic rays and the magnetic field of the nearby starburst galaxy NGC 253
- The spatial energy spectrum of magnetic fields in our Galaxy
- Structure in the Rotation Measure Sky
- The impact of Galactic synchrotron emission on CMB anisotropy measurements. I. Angular power spectrum analysis of total intensity all-sky surveys
- Magnetic structure of our Galaxy: A review of observations
- Galactic foregrounds: Spatial fluctuations and a procedure of removal
- Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission
- Global MHD Modelling of the ISM - From large towards small scale turbulence
Cited by in corpus (9)
- Mapping UHECRs deflections through the turbulent galactic magnetic field with the latest RM data
- Galactic synchrotron emission from WIMPs at radio frequencies
- Loops and spurs: The angular power spectrum of the Galactic synchrotron background
- The isotropic radio background revisited
- Cosmological Radio Emission induced by WIMP Dark Matter
- All sky angular power spectrum: I. Estimating brightness temperature fluctuations using TGSS 150 MHz survey
- Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
- Skewness and Kurtosis as Indicators of Non-Gaussianity in Galactic Foreground Maps
- Turbulent power distribution in the local interstellar medium