Exploring the hadronic origin of LHAASO J1908+0621

Abstract

Recent observations by the Large High Altitude Air Shower Observatory (LHAASO) have paved the way for the observational detection of PeVatrons in the Milky Way Galaxy, thus revolutionizing the field of $\gamma$-ray astrophysics. In this paper, we study one such detected source, LHAASO J1908+0621, and explore the origin of multi-TeV $\gamma$-ray emission from this source. A middle-aged radio supernova remnant SNR G40.5-0.5 and a GeV pulsar PSR J1907+0602 are co-spatial with LHAASO J1908+0621. Dense molecular clouds are also found to be associated with SNR G40.5-0.5. We explain the multi-TeV $\gamma$-ray emission observed from the direction of LHAASO J1908+0621, by the hadronic interaction between accelerated protons that escaped from the SNR shock front and cold protons present inside the dense molecular clouds, and the leptonic emission from the pulsar wind nebula (PWN) associated with the pulsar J1907+0602. Moreover, we explain lower energy $\gamma$-ray emission by considering the radiative cooling of the electrons that escaped from SNR G40.5-0.5. Finally, the combined lepto-hadronic scenario was used to explain the multi-wavelength spectral energy distribution (SED) of LHAASO J1908+0621. Although not yet significant, an ICECUBE hotspot of neutrino emission is spatially associated with LHAASO J1908+0621, indicating a possible hadronic contribution. In this paper, we show that if a hadronic component is present in LHAASO J1908+0621, then the second generation ICECUBE observatory will detect neutrino from this source.

arXiv comment15 pages, 4 figures, 1 table; accepted for publication in The Astrophysical Journal (ApJ)

References in corpus (33)

• Fermi Large Area Telescope Fourth Source Catalog
• Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
• Acceleration of petaelectronvolt protons in the Galactic Centre
• High-energy particle acceleration in the shell of a supernova remnant
• Time-integrated Neutrino Source Searches with 10 years of IceCube Data
• The H.E.S.S. Galactic plane survey
• The VLA Galactic Plane Survey
• A New $\Sigma -D$ Relation and Its Application to the Galactic Supernova Remnant Distribution
• Parametrization of gamma-ray production cross-sections for pp interactions in a broad proton energy range from the kinematic threshold to PeV energies
• Broad-band nonthermal emission from molecular clouds illuminated by cosmic rays from nearby supernova remnants
• TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro
• Radio to Gamma-Ray Emission from Shell-type Supernova Remnants: Predictions from Non-linear Shock Acceleration Models
• A radiation transfer model for the Milky-Way: I. Radiation fields and application to High Energy Astrophysics
• Gamma rays from molecular clouds illuminated by cosmic rays escaping from interacting supernova remnants
• TeV Gamma-Rays from Old Supernova Remnants
• Time-dependent modeling of pulsar wind nebulae: Study on the impact of the diffusion-loss approximations
• Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data
• Molecular Clouds as a Probe of Cosmic-Ray Acceleration in a Supernova Remnant
• Identifying Galactic PeVatrons with Neutrinos
• PSR J1907+0602: A Radio-Faint Gamma-Ray Pulsar Powering a Bright TeV Pulsar Wind Nebula
• Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S
• Detection of Very High Energy radiation from HESS J1908+063 confirms the Milagro unidentified source MGRO J1908+06
• Escape of cosmic-ray electrons from supernova remnants
• MAGIC observations of the diffuse $\gamma$-ray emission in the vicinity of the Galactic Centre
• Observation of the TeV gamma-ray source MGRO J1908+06 with ARGO-YBJ
• Investigating the TeV Morphology of MGRO J1908+06 with VERITAS
• Prospects for Detecting Galactic Sources of Cosmic Neutrinos with IceCube: An Update
• Investigating the nature of MGRO J1908+06 with multiwavelength observations
• Timing of 29 Pulsars Discovered in the PALFA Survey
• Radio study of the extended TeV source VER J1907+062
• Multiwavelength investigation of the candidate Galactic PeVatron MGRO J1908+06
• Interaction between Molecular Clouds and MeV-TeV Cosmic-ray Protons Escaped from Supernova Remnants
• Positron Excess from Cosmic Ray Interactions in Galactic Molecular Clouds