Discovery of Localized Regions of Excess 10-TeV Cosmic Rays

Abstract

An analysis of 7 years of Milagro data performed on a 10-degree angular scale has found two localized regions of excess of unknown origin with greater than 12 sigma significance. Both regions are inconsistent with gamma-ray emission with high confidence. One of the regions has a different energy spectrum than the isotropic cosmic-ray flux at a level of 4.6 sigma, and it is consistent with hard spectrum protons with an exponential cutoff, with the most significant excess at ~10 TeV. Potential causes of these excesses are explored, but no compelling explanations are found.

arXiv commentSubmitted to PhysRevLett

References in corpus (6)

• Pulsar rotation measures and the large-scale structure of Galactic magnetic field
• Anisotropy and Corotation of Galactic Cosmic Rays
• Discovery of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy
• Observation of TeV Gamma Rays from the Crab Nebula with Milagro Using a New Background Rejection Technique
• The Search for the Sidereal and Solar Diurnal Modulations in the Total MACRO Muon Data Set
• The puzzling MILAGRO hot spots

Cited by in corpus (87)

• Cosmic Rays from the Knee to the Highest Energies
• Sensitivity of the High Altitude Water Cherenkov Detector to Sources of Multi-TeV Gamma Rays
• The origin of Galactic cosmic rays: challenges to the standard paradigm
• The Large Scale Cosmic-Ray Anisotropy as Observed with Milagro
• Astrophysical models for the origin of the positron "excess"
• Observation of Anisotropy in the Arrival Directions of Galactic Cosmic Rays at Multiple Angular Scales with IceCube
• Turbulence, Magnetic Reconnection in Turbulent Fluids and Energetic Particle Acceleration
• Anisotropy in Cosmic-Ray Arrival Directions in the Southern Hemisphere with Six Years of Data from the IceCube Detector
• Local Magnetic Turbulence and TeV-PeV Cosmic Ray Anisotropies
• Beyond the myth of the supernova-remnant origin of cosmic rays
• Searches for Cosmic-Ray Electron Anisotropies with the Fermi Large Area Telescope
• Surveys with the Cherenkov Telescope Array
• Indirect dark matter searches in Gamma- and Cosmic Rays
• Origin of Small-Scale Anisotropies in Galactic Cosmic Rays
• Observation of Small-scale Anisotropy in the Arrival Direction Distribution of TeV Cosmic Rays with HAWC
• Magnetic reconnection as the cause of cosmic ray excess from the heliospheric tail
• 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
• Anomalous Anisotropies of Cosmic Rays from Turbulent Magnetic Fields
• The Interstellar Magnetic Field Close to the Sun II
• The puzzling MILAGRO hot spots
• All-Sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field
• Progress in high-energy cosmic ray physics
• The Sensitivity of HAWC to High-Mass Dark Matter Annihilations
• Test particle simulations of cosmic rays
• The Milagro anticenter hot spots: cosmic rays from the Geminga supernova ?
• Probing Nearby CR Accelerators and ISM Turbulence with Milagro Hot Spots
• Small-Scale Anisotropies of Cosmic Rays from Relative Diffusion
• Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC
• Observation and Spectral Measurements of the Crab Nebula with Milagro
• Anisotropic Cosmic Ray Diffusion and its Implications for Gamma-Ray Astronomy
• Neutrinos and Cosmic Rays Observed by IceCube
• Cosmic Ray Transport with Magnetic Focusing and the "Telegraph" model
• Galactic Cosmic-Ray Anisotropy in the Northern hemisphere from the ARGO-YBJ Experiment during 2008-2012
• Anisotropies of different mass compositions of cosmic rays
• The TeV Cosmic Ray Bump: a Message from Epsilon Indi or Epsilon Eridani Star?
• The local Galactic magnetic field in the direction of Geminga
• Cosmic Ray Small Scale Anisotropies and Local Turbulent Magnetic Fields
• The Vela and Geminga pulsars in the mid-infrared
• Strangelets and the TeV-PeV cosmic-ray anisotropies
• Galactic magnetic fields and the large-scale anisotropy at MILAGRO
• Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger Observatory
• TeV Cosmic-Ray Anisotropy from the Magnetic Field at the Heliospheric Boundary
• Magnetic fields and cosmic ray anisotropies at TeV energies
• A New Maximum-Likelihood Technique for Reconstructing Cosmic-Ray Anisotropy at All Angular Scales
• Dark matter electron anisotropy: a universal upper limit
• Explaining TeV Cosmic-Ray Anisotropies with Non-Diffusive Cosmic-Ray Propagation
• Statistically study the optimal local sources for cosmic ray nuclei and electron
• The sensitivity of Cherenkov telescopes to dark matter and astrophysical anisotropies in the diffuse gamma-ray background
• Cosmic Rays and Stochastic Magnetic Reconnection in the Heliotail
• Understanding the phase reversals of Galactic cosmic ray anisotropies
• Measurements and implications of cosmic ray anisotropies from TeV to trans-EeV energies
• Anisotropy in Cosmic rays from internal transitions in neutron stars
• Two Numerical Methods for the 3D Anisotropic Propagation of Galactic Cosmic Rays
• Selected Topics in Cosmic Ray Physics
• Cosmic Magnetic Lenses
• The gamma-ray spectrum of Geminga and the inverse Compton model of pulsar high energy emission
• Ultra-High Energy Cosmic Rays: Results and Prospects
• Measurement of Cosmic Ray Spectrum and Anisotropy with the ARGO-YBJ experiment
• Gamma-ray Astronomy with Muons: Sensitivity of IceCube to PeVatrons in the Southern Sky
• Cosmic Ray Confinement and Transport Models for Probing their Putative Sources
• Regions of Excessive Flux of PeV Cosmic Rays
• Observation of TeV-PeV cosmic ray anisotropy with IceCube, IceTop and AMANDA
• Observation of CR Anisotropy with ARGO-YBJ
• Large-scale anisotropy of Galactic cosmic rays as a probe of local cosmic-ray propagation
• A Search for Small-Scale Anisotropy of PeV Cosmic Rays
• Pulsar Wind Nebulae and Cosmic Rays: A Bedtime Story
• Anisotropy of TeV and PeV cosmic rays with IceCube and IceTop
• Time variability of TeV cosmic ray sky map
• Galactic Cosmic Rays - Theory and Interpretation
• Very Local Impact on the Spectrum of Cosmic-Ray Nuclei below 100 TeV
• One of Everything: The Breakthrough Listen Exotica Catalog
• Snowmass 2021 LoI: Determination of cosmic ray properties in the local interstellar medium with all-sky anisotropy observations
• Cosmic Ray transport in mixed magnetic fields and their role on the observed anisotropies
• Sky-maps of the sidereal anisotropy of galactic cosmic ray intensity and its energy dependence
• TeV-PeV Cosmic-Ray Anisotropy and Local Interstellar Turbulence
• Observation of the anisotropy in arrival direction of Cosmic Rays with IceCube
• Three Regions of Excessive Flux of PeV Cosmic Rays
• Detection of Cosmic Rays from ground: an Introduction
• Cosmic ray propagation in the interstellar magnetic fields
• Estimation of the TeV gamma-ray duty cycle of Mrk 421 with the Milagro observatory
• Experimental biases on the heliospheric contribution to the observed TeV cosmic ray anisotropy
• Observation of Anisotropy in the Arrival Direction Distribution of Cosmic Rays above TeV Energies with Icecube
• Regions of an excessive flux of cosmic rays according to data of the FIAN and MSU arrays
• Measurement of Cosmic Ray spectrum and Anisotropy with ARGO-YBJ
• Experimental Summary: Very High Energy Cosmic Rays and their Interactions
• A search for small and medium scale anisotropy of cosmic rays above 1 PeV registered at the Tunka-133 array