All-Sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field

Abstract

We present the first full-sky analysis of the cosmic ray arrival direction distribution with data collected by the HAWC and IceCube observatories in the Northern and Southern hemispheres at the same median primary particle energy of 10 TeV. The combined sky map and angular power spectrum largely eliminate biases that result from partial sky coverage and holds a key to probe into the propagation properties of TeV cosmic rays through our local interstellar medium and the interaction between the interstellar and heliospheric magnetic fields. From the map we determine the horizontal dipole components of the anisotropy ${\delta }_{0h}=9.16\times 10^{-4}$ and ${\delta }_{6h}=7.25\times 10^{-4}(\pm 0.04\times 10^{-4})$. In addition, we infer the direction ($229.2\pm 3.5^{\circ }$ RA , $11.4\pm 3.0^{\circ }$ Dec.) of the interstellar magnetic field from the boundary between large scale excess and deficit regions from which we estimate the missing corresponding vertical dipole component of the large scale anisotropy to be ${\delta }_N\sim -3.97_{-2.0}^{+1.0}\times 10^{-4}$.

arXiv commentAccepted by The Astrophysical Journal

References in corpus (50)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• The IceCube Neutrino Observatory: Instrumentation and Online Systems
• On the knee in the energy spectrum of cosmic rays
• Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above $8\times 10^{18}$ eV
• Observation of the Crab Nebula with the HAWC Gamma-Ray Observatory
• Anisotropy and Corotation of Galactic Cosmic Rays
• Very High Energy Gamma-ray Radiation from the Stellar-mass Black Hole Cygnus X-1
• Muon Track Reconstruction and Data Selection Techniques in AMANDA
• Myths and Truths Concerning Estimation of Power Spectra
• Discovery of Localized Regions of Excess 10-TeV Cosmic Rays
• Observation of the Anisotropy of 10 TeV Primary Cosmic Ray Nuclei Flux with the Super-Kamiokande-I Detector
• Diffusive propagation of cosmic rays from supernova remnants in the Galaxy. II: anisotropy
• Observation of TeV Gamma Rays from the Crab Nebula with Milagro Using a New Background Rejection Technique
• Cosmic Ray Anisotropy Analysis with a Full-Sky Observatory
• The Large Scale Cosmic-Ray Anisotropy as Observed with Milagro
• Observation of an Anisotropy in the Galactic Cosmic Ray arrival direction at 400 TeV with IceCube
• Measurement of the Anisotropy of Cosmic Ray Arrival Directions with IceCube
• Evolution of the cosmic ray anisotropy above 10^{14} eV
• Observation of Anisotropy in the Arrival Directions of Galactic Cosmic Rays at Multiple Angular Scales with IceCube
• Observation of Cosmic Ray Anisotropy with the IceTop Air Shower Array
• Large-Scale Sidereal Anisotropy of Galactic Cosmic-Ray Intensity Observed by the Tibet Air Shower Array
• Anisotropy in Cosmic-Ray Arrival Directions in the Southern Hemisphere with Six Years of Data from the IceCube Detector
• The Anisotropy of Galactic Cosmic Rays as a Product of Stochastic Supernova Explosions
• Local Magnetic Turbulence and TeV-PeV Cosmic Ray Anisotropies
• All-particle cosmic ray energy spectrum measured by the HAWC experiment from 10 to 500 TeV
• Northern sky Galactic Cosmic Ray anisotropy between 10-1000 TeV with the Tibet Air Shower Array
• Deciphering the Dipole Anisotropy of Galactic Cosmic Rays
• Origin of Small-Scale Anisotropies in Galactic Cosmic Rays
• The Search for the Sidereal and Solar Diurnal Modulations in the Total MACRO Muon Data Set
• Observation of Small-scale Anisotropy in the Arrival Direction Distribution of TeV Cosmic Rays with HAWC
• ARGO-YBJ Observation of the Large-scale Anisotropy During the Solar Minimum between Cycles 23 and 24
• Anisotropy of TeV Cosmic Rays and the Outer Heliospheric Boundaries
• Spectrum and Anisotropy of Cosmic Rays at TeV-PeV-energies and Contribution of Nearby Sources
• Anomalous Anisotropies of Cosmic Rays from Turbulent Magnetic Fields
• Solution to the cosmic ray anisotropy problem
• Understanding TeV-band cosmic-ray anisotropy
• Anisotropic diffusion of galactic cosmic ray protons and their steady-state azimuthal distribution
• Charting the Interstellar Magnetic Field causing the Interstellar Boundary Explorer (IBEX) Ribbon of Energetic Neutral Atoms
• Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC
• Solar cycle dependence of the diurnal anisotropy of 0.6 TeV cosmic ray intensity observed with the Matsushiro underground muon detector
• Galactic Cosmic-Ray Anisotropy in the Northern hemisphere from the ARGO-YBJ Experiment during 2008-2012
• Observation by an Air-Shower Array in Tibet of the Multi-TeV Cosmic-Ray Anisotropy due to Terrestrial Orbital Motion Around the Sun
• Cosmic Ray Small Scale Anisotropies and Local Turbulent Magnetic Fields
• Data Acquisition Architecture and Online Processing System for the HAWC gamma-ray observatory
• Large-Scale Cosmic-Ray Anisotropy as a Probe of Interstellar Turbulence
• TeV Cosmic-Ray Anisotropy from the Magnetic Field at the Heliospheric Boundary
• A New Maximum-Likelihood Technique for Reconstructing Cosmic-Ray Anisotropy at All Angular Scales
• Observations of Large Scale Sidereal Anisotropy in 1 and 11 TeV cosmic rays from the MINOS experiment

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• Practical Modeling of Large-Scale Galactic Magnetic Fields: Status and Prospects
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• Ultralight Black Holes as Sources of High-Energy Particles
• The TeV Cosmic Ray Bump: a Message from Epsilon Indi or Epsilon Eridani Star?
• The TeV Sun Rises: Discovery of Gamma rays from the Quiescent Sun with HAWC
• On the origin of observed cosmic ray spectrum below 100 TV
• LHAASO sensitivity for diffuse gamma-ray signals from the Galaxy
• A cosmic-ray database update: CRDB v4.1
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• No longer ballistic, not yet diffusive--the formation of cosmic ray small-scale anisotropies
• The Southern Wide-Field Gamma-ray Observatory (SWGO)
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• Observation of Cosmic-Ray Anisotropy in the Southern Hemisphere with 12 yr of Data Collected by the IceCube Neutrino Observatory
• Anisotropies of Diffusive Ultra-high Energy Cosmic Rays in $f(R)$ Gravity Theory
• Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande
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• Large-scale anisotropy of Galactic cosmic rays as a probe of local cosmic-ray propagation
• Galactic diffuse emission from radio to ultra-high-energy gamma rays in light of up-to-date cosmic ray measurements
• Very Local Impact on the Spectrum of Cosmic-Ray Nuclei below 100 TeV
• Magnetic Suppression of Cosmic Rays' Flux in $\mathbf{f}(\mathbf{R})$ and $\mathbf{f}(\mathbf{Q})$ Theories of Gravity
• Cosmic-ray energy reconstruction using machine learning techniques
• Analysing Ultra High Energy Cosmic Rays' Anisotropy in $\mathbf{f}(\mathbf{R},\mathbf{T})$ Gravity Theory
• Chaotic Behavior of Trapped Cosmic Rays
• Modelling Cosmic Rays Flux with Pierre Auger and Telescope Array Data in $\mathbf{f}(\mathbf{R})$ and $\mathbf{f}(\mathbf{Q})$ Theories of Gravity