On the hard $\gamma$-ray spectrum of the potential PeVatron supernova remnant G106.3+2.7

Abstract

The Tibet AS$\gamma$ experiment has measured $\gamma$-ray flux of supernova remnant G106.3+2.7 up to 100 TeV, suggesting it {being} potentially a "PeVatron". Challenge arises when the hadronic scenario requires a hard proton spectrum (with spectral index $\approx 1.8$), while {usual observations and numerical simulations prefer} a soft proton spectrum {(with spectral index $\ge 2$)}. In this paper, we explore an alternative scenario to explain the $\gamma$-ray spectrum of G106.3+2.7 within the current understanding of acceleration and escape processes. We consider that the cosmic ray {particles} are scattered by the turbulence driven via Bell instability. The resulting hadronic $\gamma$-ray spectrum is novel, dominating the contribution to the emission above 10\,TeV, and can explain the bizarre broadband spectrum of G106.3+2.7 in combination with leptonic emission from the remnant.

arXiv commentaccepted by ApJ

References in corpus (29)

• Birth and Evolution of Isolated Radio Pulsars
• The Velocity Distribution of Isolated Radio Pulsars
• The Origin of Galactic Cosmic Rays
• Parametrization of gamma-ray production cross-sections for pp interactions in a broad proton energy range from the kinematic threshold to PeV energies
• Cosmic ray acceleration and escape from supernova remnants
• A Census of High-Energy Observations of Galactic Supernova Remnants
• A kinetic approach to cosmic ray induced streaming instability at supernova shocks
• Gamma rays from molecular clouds illuminated by cosmic rays escaping from interacting supernova remnants
• Population synthesis studies of isolated neutron stars with magnetic field decay
• The observation of the Crab Nebula with LHAASO-KM2A for the performance study
• PSR J2229+6114: Discovery of an Energetic Young Pulsar in the Error Box of the EGRET Source 3EG J2227+6122
• Gamma rays from molecular clouds illuminated by accumulated diffusive protons from supernova remnant W28
• On the cosmic ray spectrum from type II Supernovae expanding in their red giant presupernova wind
• Potential PeVatron supernova remnant G106.3+2.7 seen in the highest-energy gamma rays
• The SNR G106.3+2.7 and its Pulsar Wind Nebula: relics of triggered star formation in a complex environment
• Kinetic Simulations of Cosmic-Ray-Modified Shocks II: Particle Spectra
• Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
• Discovery of a 105 ms X-ray Pulsar in Kesteven 79: On the Nature of Compact Central Objects in Supernova Remnants
• Precise Timing of the X-ray Pulsar 1E 1207.4-5209: A Steady Neutron Star Weakly Magnetized at Birth
• Gamma-rays from molecular clouds illuminated by accumulated diffusive protons. II: interacting supernova remnants
• HAWC J2227+610 and its association with G106.3+2.7, a new potential Galactic PeVatron
• Escape of cosmic-ray electrons from supernova remnants
• Exploring particle escape in supernova remnants through gamma rays
• A Python Calculator for Supernova Remnant Evolution
• VER J2227+608: A Hadronic PeVatron Pulsar Wind Nebula?
• Pulsar Wind Nebulae inside Supernova Remnants as Cosmic-Ray PeVatrons
• Hadronic vs leptonic models for $\gamma$-ray emission from VER J2227+608
• X-Ray Emission from the PeVatron-candidate Supernova Remnant G106.3+2.7
• Revealing a peculiar supernova remnant G106.3+2.7 as a petaelectronvolt proton accelerator with X-ray observations

Cited by in corpus (2)

• MAGIC observations provide compelling evidence of the hadronic multi-TeV emission from the putative PeVatron SNR G106.3+2.7
• A Possible Hadronic Origin of TeV Photon Emission from SNR G106.3+2.7