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

• Published in: arXiv.org 2023-10
• Main Authors: Alfaro, R, Alvarez, C, Arteaga-Velazquez, J C, Arunbabu, K P, D Avila Rojas, Babu, R, Baghmanyan, V, Belmont-Moreno, E, Brisbois, C, Caballero-Mora, K S, Capistran, T, Carraminana, A, Casanova, S, Chaparro-Amaro, O, Cotti, U, Cotzomi, J, S Coutino de Leon, De la Fuente, E, R Diaz Hernandez, DuVernois, M A, Durocher, M, Dıaz-Velez, J C, Engel, K, Espinoza, C, Fan, K L, Fraija, N, Galvan-Gamez, A, Garcıa-Gonzalez, J A, Garfias, F, Gonzalez, M M, Goodman, J A, Hernandez, S, Hona, B, Huang, D, Hueyotl-Zahuantitla, F, Humensky, T B, Iriarte, A, Joshi, V, Kaufmann, S, Kieda, D, Kunde, G J, Lara, A, H Leon Vargas, Linnemann, J T, Longinotti, A L, Luis-Raya, G, Malone, K, Martinez, O, Martınez-Castro, J, Matthews, J A, Miranda-Romagnoli, P, Moreno, E, Mostafa, M, Nayerhoda, A, Nellen, L, Noriega-Papaqui, R, Perez-Perez, E G, Rosa-Gonzalez, D, Ruiz-Velasco, E, Salazar, H, Salazar-Gallegos, D, F Salesa Greus, Sandoval, A, Serna-Franco, J, Smith, A J, Springer, R W, Tibolla, O, Tollefson, K, Torres, I, Torres-Escobedo, R, Urena-Mena, F, Villasenor, L, Willox, E, Zhou, H, de Leon, C, nieri, O, Gaggero, D, Grasso, D, Marinelli, A, Ventura, S
• Format: Article
• Language: English
• Subjects: Cosmic rays; Electromagnetic radiation; Electrons; Emission analysis; Galactic halos; Gamma rays; High altitude; Interstellar gas; Interstellar matter; Longitude; Pulsars; Radiation; Stellar winds
• ISSN: 2331-8422

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.