A New Model of the Galactic Magnetic Field

Abstract

A new, much improved model of the Galactic Magnetic Field (GMF) is presented. We use the WMAP7 Galactic Synchrotron Emission map and more than forty thousand extragalactic rotation measures to constrain the parameters of the GMF model, which is substantially generalized compared to earlier work to now include an out-of-plane component (as suggested by observations of external galaxies) and striated-random fields (motivated by theoretical considerations). The new model provides a greatly improved fit to observations. Consistent with our earlier analyses, the best-fit model has a disk field and an extended halo field. Our new analysis reveals the presence of a large, out-of-plane component of the GMF; as a result, the polarized synchrotron emission of our Galaxy seen by an edge-on observer is predicted to look intriguingly similar to what has been observed in external edge-on galaxies. We find evidence that the cosmic ray electron density is significantly larger than given by GALPROP, or else that there is a widespread striated component to the GMF.

14 pages, 11 figures. Submitted to ApJ

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• Effects of Depolarizing Intervening Galaxies on Background Radio Emission I. Global Disk Magnetic Field
• Some Aspects of Rotation and Magnetic Field Morphology in the Infrared Dark Cloud G34.43+00.24
• X-ray polarimetric features of Gamma-ray Bursts across varied redshifts and hints for Axion-Like-Particles
• Reconstructing the Magnetic Field in an Arbitrary Domain via Data-driven Bayesian Methods and Numerical Simulations
• Polarized synchrotron data and the structure of the Galactic magnetic field
• Long, depolarising H$\alpha$-filament towards the Monogem ring
• The traveling-PWN modeling attempt on the enigmatic LHAASO dumbbell-like structure
• Imprints of Dark Photons on Gravitational Wave Polarizations
• The influence of the 3D Galactic gas structure on cosmic-ray transport and $\gamma$-ray emission
• A refined model of secondary photon emission from heavy WIMP annihilations in the Galactic Centre
• Extragalactic Sources and Propagation of UHECRs
• Explaining the UHECR spectrum, composition and large-scale anisotropies with radio galaxies
• Axion-like Particles and their Possible Impact on the Very High-Energy Spectrum of M87 Observed by LHAASO
• Search of extended emission from HESS J1702-420 with eROSITA
• Displacement of ultra-high-energy cosmic ray source images by the intergalactic magnetic field: the cases of Cen A and M83
• Using low-frequency pulsar observations to study the 3-D structure of the Galactic magnetic field
• Momentum deposition of supernovae with cosmic rays
• Results from the Pierre Auger Observatory
• Towards extracting cosmic magnetic field structures from cosmic-ray arrival directions
• Probing the magneto-ionic medium of the Milky Way using pulsars
• Forecast constraints on the axion-photon coupling from interstellar medium heating
• TRIShUL: Technique for Reconstructing magnetic Interstellar Structure Using starLight polarization
• Anisotropic diffusion modeling of cosmic-ray lepton propagation
• High-Energy Cosmic Rays from Radio Galaxies
• Projected sensitivity of CTAO to axion-like particles from blazars with a machine learning approach
• Impact of the EPOS.LHC-R hadronic interaction model on the Centaurus A ultrahigh-energy cosmic-ray scenario
• The Cosmic-ray Knee as a Local Signature of Nearby PeVatrons
• Observational constraints on accelerators of ultra-high energy cosmic rays
• Hadronic origin of gamma rays and neutrinos from blazars: Multi-messenger implications and observational constraints
• Unveiling axion signals in galactic supernovae with future MeV telescopes
• UHECRs Propagation and their Multimessengers: Upper limits and the Impact of the Extragalactic Magnetic Field