Ultra-High-Energy Gamma-Ray Astronomy

Abstract

Ultra-High Energy (UHE, $>$0.1\,PeV) $\gamma$-ray Astronomy is rapidly evolving into an expanding branch of the $\gamma$-ray astronomy with the surprising discovery of 12 PeVatrons and the detection of a handful of photons above 1 PeV. Nearly all known celestial object types that have emissions in the TeV band are found also emitting UHE photons. UHE $\gamma$-rays have a well-defined horizon inside our galaxy due to the absorption of infrared and cosmic microwave backgrounds in the universe. With the last 30 years, traditional cosmic ray (CR) detection techniques allow the detection of UHE $\gamma$-rays, and opened up the last observation window. For leptonic sources, UHE radiation is in the deep Klein-Nishina regime which is largely suppressed. Therefore UHE $\gamma$-ray detection will help to locate and identify hadronic radiation sources, tracing the historic pursuit for the origin of CRs around the knee of the spectrum. The Crab Nebula is again the focus of attention with measured photon emissions above 1\,PeV. In the absence of hadronic processes, this may indicate the existence of an extreme accelerator of e${}^{+}$/e${}^{-}$. Utilization of the CR extensive air shower detection techniques broadens the field of view of the source observations, enabling the measurement of UHE radiation surrounding the sources. These observations can probe the particle propagation inside and outside the accelerators and the subsequent injection/escape into the interstellar medium.

arXiv comment23 pages, 6 figures, to appear in Annual Review of Nuclear and Particle Science

References in corpus (100)

• Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
• The extragalactic optical-infrared background radiations, their time evolution and the cosmic photon-photon opacity
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• The Evolution and Structure of Pulsar Wind Nebulae
• Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium
• The Origin of Galactic Cosmic Rays
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Acceleration of petaelectronvolt protons in the Galactic Centre
• Discovery of Very-High-Energy Gamma-Rays from the Galactic Centre Ridge
• On astrophysical solution to ultra high energy cosmic rays
• Primary particle acceleration above 100 TeV in the shell-type Supernova Remnant RX J1713.7-3946 with deep H.E.S.S. observations
• Teraelectronvolt Astronomy
• TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro
• Analytical solutions for energy spectra of electrons accelerated by nonrelativistic shock-waves in shell type supernova remnants
• Fitting Pulsar Wind Tori
• Multiple Galactic Sources with Emission Above 56 TeV Detected by HAWC
• Monte Carlo design studies for the Cherenkov Telescope Array
• First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies
• Neutral pion emission from accelerated protons in the supernova remnant W44
• The Crab pulsar in the 0.75-30 MeV range as seen by CGRO COMPTEL
• 3HWC: The Third HAWC Catalog of Very-High-Energy Gamma-ray Sources
• Sensitivity of the High Altitude Water Cherenkov Detector to Sources of Multi-TeV Gamma Rays
• First Detection of Photons with Energy Beyond 100 TeV from an Astrophysical Source
• Measurement of the Cosmic Ray Energy Spectrum and Composition from 10^{17} to 10^{18.3} eV Using a Hybrid Fluorescence Technique
• Attenuation of VHE gamma rays by the Milky Way interstellar radiation field
• An unidentified TeV source in the vicinity of Cygnus OB2
• First detection of VHE gamma-rays from SN 1006 by H.E.S.S
• Cosmic Ray Transport in the Galaxy: a Review
• A Measurement of the Spatial Distribution of Diffuse TeV Gamma Ray Emission from the Galactic Plane with Milagro
• A radiation transfer model for the Milky-Way: I. Radiation fields and application to High Energy Astrophysics
• Eight gamma-ray pulsars discovered in blind frequency searches of Fermi LAT data
• Very high energy particle acceleration powered by the jets of the microquasar SS 433
• Measurement of the Crab Nebula Spectrum Past 100 TeV with HAWC
• The observation of the Crab Nebula with LHAASO-KM2A for the performance study
• Radial distribution of the diffuse gamma-ray emissivity in the galactic disk
• Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622 + 3749 Observed by LHAASO-KM2A
• The Knee of the Cosmic Hydrogen and Helium Spectrum below 1 PeV Measured by ARGO-YBJ and a Cherenkov Telescope of LHAASO
• Using HAWC to Discover Invisible Pulsars
• Discovery of extended VHE γ-ray emission from the vicinity of the young massive stellar cluster Westerlund 1
• On the TeV Halo Fraction in gamma-ray bright Pulsar Wind Nebulae
• Self-Generated Cosmic-Ray Confinement in TeV Halos: Implications for TeV Gamma-Ray Emission and the Positron Excess
• HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon
• Detection of a $\gamma$-ray halo around Geminga with the Fermi-LAT and implications for the positron flux
• Diffuse Galactic gamma-ray emission with H.E.S.S
• Space- and Ground-Based Gamma-Ray Astrophysics
• Identification of the TeV Gamma-ray Source ARGO J2031+4157 with the Cygnus Cocoon
• A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A
• TeV Halos are Everywhere: Prospects for New Discoveries
• The Large High Altitude Air Shower Observatory (LHAASO) Science Book (2021 Edition)
• Signatures of high energy protons in pulsar winds
• Study of the diffuse gamma-ray emission from the Galactic plane with ARGO-YBJ
• Potential PeVatron supernova remnant G106.3+2.7 seen in the highest-energy gamma rays
• AGILE detection of GeV gamma-ray emission from the SNR W28
• TeV gamma-ray survey of the Northern sky using the ARGO-YBJ detector
• The SNR G106.3+2.7 and its Pulsar Wind Nebula: relics of triggered star formation in a complex environment
• Understanding the multiwavelength observation of Geminga's TeV halo: the role of anisotropic diffusion of particles
• Observation of the Cosmic Ray Moon shadowing effect with ARGO-YBJ
• Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array
• Gamma-ray observations of Tycho's SNR with VERITAS and Fermi
• Possible origin of the slow-diffusion region around Geminga
• The Hunt for Pevatrons: The Case of Supernova Remnants
• Diffuse gamma-ray emission in the vicinity of young star cluster Westerlund 2
• Detection of Extended VHE Gamma Ray Emission from G106.3+2.7 with VERITAS
• Gamma-ray halos around pulsars as the key to understanding cosmic ray transport in the Galaxy
• Constraining the properties of the magnetic turbulence in the Geminga region using HAWC $\gamma$-ray data
• Fermi Large Area Telescope Performance After 10 Years Of Operation
• HAWC J2227+610 and its association with G106.3+2.7, a new potential Galactic PeVatron
• MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV
• MAGIC observations of the diffuse $\gamma$-ray emission in the vicinity of the Galactic Centre
• A Possible X-ray and Radio Counterpart of the High-Energy Gamma-ray Source 3EG J2227+6122
• VERITAS Observations of the Galactic Center Region at Multi-TeV Gamma-Ray Energies
• Gamma-ray observations of the microquasars Cygnus X-1, Cygnus X-3, GRS 1915+105, and GX 339-4 with the Fermi Large Area Telescope
• Self-Generated Cosmic-Ray Turbulence Can Explain the Morphology of TeV Halos
• On the potential of bright, young pulsars to power ultra-high gamma-ray sources
• VER J2227+608: A Hadronic PeVatron Pulsar Wind Nebula?
• Particle Injection and Nonthermal Particle Acceleration in Relativistic Magnetic Reconnection
• Exploration of a 100 TeV gamma-ray northern sky using the Tibet air-shower array combined with an underground water-Cherenkov muon-detector array
• Discovery of the hard spectrum VHE gamma-ray source HESS J1641-463
• GeV observations of the extended pulsar wind nebulae constrain the pulsar interpretations of the cosmic-ray positron excess
• Constraining the magnetic field in the TeV halo of Geminga with X-ray Observation
• Constraints on heavy decaying dark matter from 570 days of LHAASO observations
• Observation of photons above 300 TeV associated with a high-energy neutrino from the Cygnus region
• Diffuse gamma-ray emission toward the massive star-forming region, W40
• The Crab Nebula at 1.3 mm: evidence for a new synchrotron component
• The Physics of Pulsar Halos: Research Progress and Prospect
• MAGIC observations provide compelling evidence of the hadronic multi-TeV emission from the putative PeVatron SNR G106.3+2.7
• Evidence for PeV Proton Acceleration from Fermi-LAT Observations of SNR G106.3+2.7
• X-Ray Emission from the PeVatron-candidate Supernova Remnant G106.3+2.7
• The diffuse gamma-ray emission toward the Galactic mini starburst W43
• Gamma-ray Observation of the Cygnus Region in the 100 TeV Energy Region
• Revised predictions of neutrino fluxes from Pulsar Wind Nebulae
• Anisotropic diffusion cannot explain TeV halo observations
• On the Unusually Large Spatial Extent of the TeV nebula HESS J1825-137: Implication from the Energy-Dependent Morphology
• Multi-band Emission up to PeV Energy from the Crab Nebula in a Spatially Dependent Lepto-hadronic Model
• Ultrahigh-energy Gamma-Ray Radiation from the Crab Pulsar Wind Nebula
• Detection of Small Flares from the Crab Nebula with Fermi-LAT
• Modeling the broadest spectral band of the Crab nebula and constraining the ions acceleration efficiency
• Investigating the multiband nonthermal emission of the 100 TeV source eHWC J2019$+$368 with a pulsar wind nebula scenario
• Prospect of detecting TeV halos with LHAASO: in the framework of the anisotropic diffusion model
• LHAASO J2226+6057 as a pulsar wind nebula

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• The expected potential of hadronic PeVatron searches with spectral $\gamma$-ray data from the Southern Wide-field Gamma-ray Observatory
• The GPSP Atlas: High-resolution Galactic Photon Survival Probability Atlas for Very-High- and Ultra-High-Energy Gamma-Ray Astronomy
• Constraining the synchrotron peak and estimating the VHE brightness of a sample of extreme high synchrotron peak blazars
• Are Kronberger 80 and/or Kronberger 82 regions PeVatron candidates for LHAASO J2108+5157?