Year: 2026
Type: preprint
Abstract: We present an updated High-Altitude Water Cherenkov (HAWC) analysis of the crowded Galactic-plane area near PSR J1928+1746, which was previously linked to the extended source 3HWC J1928+178. With 2904 days of HAWC data, improved event reconstruction, and a multicomponent likelihood model that includes six TeV source components and Galactic diffuse emission, we describe the region using six components and find a distinct, moderately extended source close to PSR J1928+1746. This source, HAWC J1928+1750, is detected from about 2 TeV to above 100 TeV and is well-described by a log-parabola spectrum with normalization $K = 5.0 \times 10^{-15}$ TeV$^{-1}$ cm$^{-2}$ s$^{-1}$ at 12 TeV, index $α= 2.09$, curvature $β= 0.35$, and Gaussian extension $σ= 0.19^\circ$. Interpreting the emission using diffusion-halo templates under the assumption $B = 8 μ\mathrm{G}$ yields the diffusion coefficient D(100 TeV) = $2.1 \times 10^{27}$ cm$^2$ s$^{-1}$, which is about 500 times smaller than typical interstellar diffusion values at similar energies. This suggests that particle transport around PSR J1928+1746 is strongly suppressed under the TeV-halo interpretation. The TeV spectrum is consistent with leptonic inverse-Compton emission originating from pulsar-injected electrons and positrons, which requires less than approximately 1% of the pulsar's characteristic spin-down energy. However, a hadronic contribution from the surrounding environment cannot be excluded.
Source: arXiv (Cornell University)
Authors: The HAWC Collaboration, Alfaro, R., Alvarez, C., Andrés, A., Anita-Rangel, E., Araya, M., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Babu, R., Bangale, P., Bernal, A., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Carreón, F., Casanova, S., Cotti, U., Cotzomi, J., De la Fuente, E., Desiati, P., Di Lalla, N., Hernandez, R. Diaz, DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Ergin, T., Espinoza, C., Fraija, N., Fraija, S., García-González, J. A., Garfias, F., Ghosh, N., Giri, S., González, M. M., González, J. A., Goodman, J. A., Groetsch, S., Gyeong, J., Harding, J. P., Herzog, I., Huang, D., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Kaufmann, S., Kieda, D., Lake, R., Leavitt, K., Vargas, H. León, Longinotti, A. L., Luis-Raya, G., Malone, K., Martinez, O., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Mirón-Enriquez, P. E., Morales-Soto, J. A., Moreno, E., Mostafá, M., Najafi, M., Nellen, L., Nisa, M. U., Noriega-Papaqui, R., Osorio-Archila, M., Omodei, N., Ponce, E., Araujo, Y. Pérez, Pérez-Pérez, E. G., Recchia, S., Rho, C. D., Rosa-González, D., Roth, M., Sandoval, A., Schneider, M., Serna-Franco, J., Shin, M., Smith, A. J., Son, Y., Springer, R. W., Tibolla, O., Tollefson, K., Torres, I., Torres-Escobedo, R., Varela, E., Villaseñor, L., Wang, X., Wang, Z., Watson, I. J., Wu, H., Yu, S., Yun-Cárcamo, S., Zhang, X., Zhou, H., de León, C.
Institutions: Universidad Nacional Autónoma de México, Universidad Autónoma de Chiapas, Temple University, Michigan State University, National Institute of Astrophysics, Optics and Electronics, Institute of Nuclear Physics, Polish Academy of Sciences, Benemérita Universidad Autónoma de Puebla, Universidad de Guadalajara, University of Wisconsin–Madison, University of Maryland, College Park, Michigan Technological University, Universidad Michoacana de San Nicolás de Hidalgo, Max Planck Institute for Nuclear Physics, Universidad Politécnica de Pachuca, Los Alamos National Laboratory, University of Missouri–Kansas City, University of Delaware, Stanford University, Sungkyunkwan University, University of Utah, Missouri University of Science and Technology, University of Seoul, Pennsylvania State University, Drexel University, Shanghai Jiao Tong University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, European Commission, Consejo Nacional de Ciencia y Tecnología, National Research Foundation of Korea, Benemérita Universidad Autónoma de Puebla, Office of National Higher Education Science Research and Innovation Policy Council, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, Coordinación de la Investigación Científica, Institute for Cosmic Ray Research, University of Tokyo, Laboratory Directed Research and Development, Los Alamos National Laboratory, NextGenerationEU
Awards: G1012113107, G1137351982, G1451311200, G1477402476, G1943778919, G20842220, G227081073, G2834597881, G2888432734, G3092080779, G3432588090, G3455266465, G3650325917, G4234058003, G4385750942, G4656072107, G4673649240, G4840023426, G5185440073, G5756405743, G5884581963, G5928845074, G5984383661, G6809838226, G6958583472, G7223072566, G726386190, G7379686924, G7757046036, G7866310431, G8432112341, G8651248068, G8700648374
OpenAlex ID: W7223241964