Galactic Gamma-Ray Diffuse Emission at TeV energies with HAWC Data

Abstract

The Galactic gamma-ray diffuse emission (GDE) is emitted by cosmic rays (CRs), ultra-relativistic protons and electrons, interacting with gas and electromagnetic radiation fields in the interstellar medium. Here we present the analysis of TeV diffuse emission from a region of the Galactic Plane over the range in longitude of $l\in [43^{\circ },73^{\circ }]$, using data collected with the High Altitude Water Cherenkov (HAWC) detector. Spectral, longitudinal and latitudinal distributions of the TeV diffuse emission are shown. The radiation spectrum is compatible with the spectrum of the emission arising from a CR population with an "index" similar to that of the observed CRs. When comparing with the \texttt{DRAGON} \textit{base model}, the HAWC GDE flux is higher by about a factor of two. Unresolved sources such as pulsar wind nebulae and TeV halos could explain the excess emission. Finally, deviations of the Galactic CR flux from the locally measured CR flux may additionally explain the difference between the predicted and measured diffuse fluxes.

References in corpus (13)

• The CO-to-H2 Conversion Factor
• The H.E.S.S. Galactic plane survey
• Observation of the Crab Nebula with the HAWC Gamma-Ray Observatory
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• Proton and Helium Spectra from the CREAM-III Flight
• GALPROP WebRun: an internet-based service for calculating galactic cosmic ray propagation and associated photon emissions
• Observation of TeV Gamma Rays from the Crab Nebula with Milagro Using a New Background Rejection Technique
• Radial distribution of the diffuse gamma-ray emissivity in the galactic disk
• The Multi-Mission Maximum Likelihood framework (3ML)
• Nearby supernova remnants and the cosmic-ray spectral hardening at high energies
• The High-Altitude Water Cherenkov (HAWC) Observatory in México: The Primary Detector
• Spectral features in the cosmic ray fluxes
• The contribution of Galactic TeV pulsar wind nebulae to Fermi-LAT diffuse emission