HAWC Study of Very-High-Energy $\gamma$-ray Spectrum of HAWC J1844-034

• Main Authors: HAWC Collaboration, Albert, A, Alvarez, C, Rojas, D. Avila, Solares, H. A. Ayala, Babu, R, Belmont-Moreno, E, Breuhaus, M, Capistrán, T, Carramiñana, A, Casanova, S, Cotzomi, J, de León, S. Coutiño, De la Fuente, E, Depaoli, D, Hernandez, R. Diaz, Dingus, B. L, DuVernois, M. A, Durocher, M, Engel, K, Espinoza, C, Fan, K. L, Fang, K, Fraija, N, García-González, J. A, González, M. M, Goodman, J. A, Groetsch, S, Harding, J. P, Herzog, I, Hinton, J, Huang, D, Hueyotl-Zahuantitla, F, Humensky, T. B, Hüntemeyer, P, Joshi, V, Kaufmann, S, Lee, J, Vargas, H. León, Longinotti, A. L, Luis-Raya, G, Malone, K, Martinez, O, Martínez-Castro, J, Matthews, J. A, Miranda-Romagnoli, P, Morales-Soto, J. A, Moreno, E, Mostafá, M, Nellen, L, Noriega-Papaqui, R, Olivera-Nieto, L, Omodei, N, Pérez-Pérez, E. G, Rho, C. D, Rosa-González, D, Ruiz-Velasco, E, Salazar, H, Salazar-Gallegos, D, Sandoval, A, Schneider, M, Serna-Franco, J, Smith, A. J, Son, Y, Springer, R. W, Tibolla, O, Tollefson, K, Torres, I, Torres-Escobedo, R, Turner, R, Ureña-Mena, F, Varela, E, Villaseñor, L, Wang, X, Watson, I. J, Willox, E, Zhou, H
• Format: Journal Article
• Language: English
• Published: 07.09.2023
• Subjects: Physics - High Energy Astrophysical Phenomena
• DOI: 10.48550/arxiv.2309.04079

ApJ 954 (2023) 205 Recently, the region surrounding eHWC J1842-035 has been studied extensively by gamma-ray observatories due to its extended emission reaching up to a few hundred TeV and potential as a hadronic accelerator. In this work, we use 1,910 days of cumulative data from the High Altitude Water Cherenkov (HAWC) observatory to carry out a dedicated systematic source search of the eHWC J1842-035 region. During the search we have found three sources in the region, namely, HAWC J1844-034, HAWC J1843-032, and HAWC J1846-025. We have identified HAWC J1844-034 as the extended source that emits photons with energies up to 175 TeV. We compute the spectrum for HAWC J1844-034 and by comparing with the observational results from other experiments, we have identified HESS J1843-033, LHAASO J1843-0338, and TASG J1844-038 as very-high-energy gamma-ray sources with a matching origin. Also, we present and use the multi-wavelength data to fit the hadronic and leptonic particle spectra. We have identified four pulsar candidates in the nearby region from which PSR J1844-0346 is found to be the most likely candidate due to its proximity to HAWC J1844-034 and the computed energy budget. We have also found SNR G28.6-0.1 as a potential counterpart source of HAWC J1844-034 for which both leptonic and hadronic scenarios are feasible.