Investigating the nature of MGRO J1908+06 with multiwavelength observations

Abstract

The unidentified TeV source MGRO J1908+06, with emission extending from hundreds of GeV to beyond 100TeV, is one of the most intriguing sources in the Galactic plane. MGRO J1908+06 spatially associates with an IceCube hotspot of neutrino emission. Although the hotspot is not significant yet, this suggests a possible hadronic origin of the observed gamma-ray radiation. Here we describe a multiwavelength analysis on MGRO J1908+06 to determine its nature. We identify, for the first time, an extended GeV source as the counterpart of MGRO J1908+06, discovering possibly associated molecular clouds (MCs). The GeV spectrum shows two well-differentiated components: a soft spectral component below $\sim 10$ GeV, and a hard one ($\Gamma \sim 1.6$) above these energies. The lower-energy part is likely associated with the dense MCs surrounding the supernova remnant SNR G40.5$-$0.5, whereas the higher-energy component, which connects smoothly with the spectrum observed in TeV range, resembles the inverse Compton emission observed in relic pulsar wind nebulae. This simple scenario seems to describe the data satisfactorily, but raises questions about the interpretation of the emission at hundreds of TeV. In this scenario, no detectable neutrino flux would be expected.

arXiv commentApJL in press

References in corpus (43)

• Fermi Large Area Telescope Fourth Source Catalog
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• High-energy particle acceleration in the shell of a supernova remnant
• Time-integrated Neutrino Source Searches with 10 years of IceCube Data
• The VLA Galactic Plane Survey
• A New $\Sigma -D$ Relation and Its Application to the Galactic Supernova Remnant Distribution
• Parameterization of Gamma, e^+/- and Neutrino Spectra Produced by p-p Interaction in Astronomical Environment
• The 2HWC HAWC Observatory Gamma Ray Catalog
• TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro
• Fermi Large Area Telescope Observations of the Crab Pulsar and Nebula
• The 1st Fermi Lat Supernova Remnant Catalog
• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• Multiple Galactic Sources with Emission Above 56 TeV Detected by HAWC
• Modeling the spectral evolution of PWNe inside SNRs
• The Milky Way Imaging Scroll Painting (MWISP): Project Details and Initial Results from the Galactic Longitude of 25.8deg to 49.7deg
• Energy dependent gamma-ray morphology in the Pulsar wind nebula HESSJ1825-137
• A radiation transfer model for the Milky-Way: I. Radiation fields and application to High Energy Astrophysics
• Search for Spatially Extended Fermi-LAT Sources Using Two Years of Data
• A Model of the Spectral Evolution of Pulsar Wind Nebulae
• Time-dependent modeling of pulsar wind nebulae: Study on the impact of the diffusion-loss approximations
• Cosmic-ray transport from AMS-02 B/C data: benchmark models and interpretation
• Detection of the energetic pulsar PSR B1509-58 and its pulsar wind nebula in MSH 15-52 using the Fermi-Large Area Telescope
• The Large High Altitude Air Shower Observatory (LHAASO) Science Book (2021 Edition)
• Probing the extent of the non-thermal emission from the Vela X region at TeV energies with H.E.S.S
• Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data
• Particle Transport within the Pulsar Wind Nebula HESS J1825-137
• Fermi-LAT Search for Pulsar Wind Nebulae around gamma-ray Pulsars
• PSR J1907+0602: A Radio-Faint Gamma-Ray Pulsar Powering a Bright TeV Pulsar Wind Nebula
• Detection of Very High Energy radiation from HESS J1908+063 confirms the Milagro unidentified source MGRO J1908+06
• Detection of the Pulsar Wind Nebula HESS J1825-137 with the Fermi Large Area Telescope
• Observation of the TeV gamma-ray source MGRO J1908+06 with ARGO-YBJ
• Investigating the TeV Morphology of MGRO J1908+06 with VERITAS
• Constraining the magnetic field in the TeV halo of Geminga with X-ray Observation
• Molecular Environment and an X-ray Spectroscopy of Supernova Remnant Kesteven 78
• An energy-conserving, particle dominated, time-dependent model of 3C58 and its observability at high-energies
• Gamma-ray heartbeat powered by the microquasar SS 433
• Timing of 29 Pulsars Discovered in the PALFA Survey
• Radio study of the extended TeV source VER J1907+062
• On the Unusually Large Spatial Extent of the TeV nebula HESS J1825-137: Implication from the Energy-Dependent Morphology
• A Small-Scale Investigation of Molecular Emission toward the Tip of the Western Lobe of W50/SS433
• VERITAS Observations of Mgro J1908+06/Hess J1908+063

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