Paper

Unveiling extended gamma-ray emission around HESS J1813-178

Tanaka, T, Specovius, A, Aharonian, F, Doroshenko, V, Goswami, P, Katarzyński, K, Borowska, J, Shapopi, J N S, Einecke, S, Kostunin, D, Steinmassl, S, Panter, M, Cerruti, M, Jamrozy, M, Montanari, A, Steenkamp, R, Glawion, D, Holler, M, Celic, J, Hinton, J A, Kluźniak, W, B Bi, Kosack, K, Backes, M, Klepser, S, Martí-Devesa, G, Vecchi, M, Zouari, S, Schüssler, F, Burger-Scheidlin, C, Olivera-Nieto, L, Reville, B, Casanova, S, Gabici, S, Giavitt, G, Leuschner, F, Funk, S, Batzofin, R, Brun, F, Khatoon, R, Pühlhofer, G, Renaud, M, J -P Lenain, Regeard, M, Tsuji, N, Wierzcholska, A, Mohrmann, L, H E S S Collaboration, Dmytriiev, A, Spencer, S, Veh, J, Vink, J, Mbarubucyeye, J Damascene, Baktash, A, Hofmann, W, Marinos, P, Terrier, R, Rieger, F, Feijen, K, Reichherzer, P, Zdziarski, A A, Ren, H, Wach, T, Ostrowski, M, Mitchell, A, Glicenstein, J F, Zargaryan, D, Punch, M, M de Bony de Lavergne, Moulin, E, Marx, R, M -H Grondin, Murach, T, Cotter, G, Schutte, H M, Salzmann, H, Bruno, B, Ghafourizadeh, S, Cecil, R, Moderski, R, Lang, R G, Sushch, I, Takahashi, T, Füßling, M, Boisson, C, Wagner, S J, Noel, A Priyana, Bernlöhr, K, Leitl, F, Prokhorov, D A, Żywucka, N, Meh

2024

Overview

HESS J1813\\(-\\)178 is a very-high-energy \\(\\gamma\\)-ray source spatially coincident with the young and energetic pulsar PSR J1813\\(-\\)1749 and thought to be associated with its pulsar wind nebula (PWN). Recently, evidence for extended high-energy emission in the vicinity of the pulsar has been revealed in the Fermi Large Area Telescope (LAT) data. This motivates revisiting the HESS J1813\\(-\\)178 region, taking advantage of improved analysis methods and an extended data set. Using data taken by the High Energy Stereoscopic System (H.E.S.S.) experiment and the Fermi-LAT, we aim to describe the \\(\\gamma\\)-ray emission in the region with a consistent model, to provide insights into its origin. We performed a likelihood-based analysis on 32 hours of H.E.S.S. data and 12 years of Fermi-LAT data and fit a spectro-morphological model to the combined datasets. These results allowed us to develop a physical model for the origin of the observed \\(\\gamma\\)-ray emission in the region. In addition to the compact very-high-energy \\(\\gamma\\)-ray emission centered on the pulsar, we find a significant yet previously undetected component along the Galactic plane. With Fermi-LAT data, we confirm extended high-energy emission consistent with the position and elongation of the extended emission observed with H.E.S.S. These results establish a consistent description of the emission in the region from GeV energies to several tens of TeV. This study suggests that HESS J1813\\(-\\)178 is associated with a \\(\\gamma\\)-ray PWN powered by PSR J1813\\(-\\)1749. A possible origin of the extended emission component is inverse Compton emission from electrons and positrons that have escaped the confines of the pulsar and form a halo around the PWN.

• Publisher: Cornell University Library, arXiv.org
• Subject: Gamma emission / Gamma ray astronomy / Gamma ray sources / High energy astronomy / Nebulae / Positrons / Pulsars / Stellar winds