Unveiling extended gamma-ray emission around HESS J1813-178
Abstract
HESS J1813178 is a very-high-energy -ray source spatially coincident with the young and energetic pulsar PSR J18131749 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 J1813178 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 -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 -ray emission in the region. In addition to the compact very-high-energy -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 J1813178 is associated with a -ray PWN powered by PSR J18131749. 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.
Keywords
Cite
@article{arxiv.2403.16802,
title = {Unveiling extended gamma-ray emission around HESS J1813-178},
author = {F. Aharonian and F. Ait Benkhali and J. Aschersleben and H. Ashkar and M. Backes and A. Baktash and V. Barbosa Martins and J. Barnard and R. Batzofin and Y. Becherini and D. Berge and K. Bernlöhr and B. Bi and M. Böttcher and C. Boisson and J. Bolmont and M. de Bony de Lavergne and J. Borowska and M. Bouyahiaoui and M. Breuhaus and R. Brose and F. Brun and B. Bruno and T. Bulik and C. Burger-Scheidlin and S. Caroff and S. Casanova and R. Cecil and J. Celic and M. Cerruti and P. Chambery and T. Chand and A. Chen and J. Chibueze and O. Chibueze and G. Cotter and J. Damascene Mbarubucyeye and A. Djannati-Ataï and A. Dmytriiev and V. Doroshenko and S. Einecke and J. -P. Ernenwein and K. Feijen and M. Filipovic and G. Fontaine and M. Füßling and S. Funk and S. Gabici and Y. A. Gallant and S. Ghafourizadeh and G. Giavitt and D. Glawion and J. F. Glicenstein and P. Goswami and G. Grolleron and M. -H. Grondin and J. A. Hinton and W. Hofmann and T. L. Holch and M. Holler and M. Jamrozy and F. Jankowsky and V. Joshi and I. Jung-Richardt and K. Katarzyński and R. Khatoon and B. Khélifi and S. Klepser and W. Kluźniak and Nu. Komin and K. Kosack and D. Kostunin and A. Kundu and R. G. Lang and S. Le Stum and F. Leitl and A. Lemière and M. Lemoine-Goumard and J. -P. Lenain and F. Leuschner and J. Mackey and D. Malyshev and D. Malyshev and V. Marandon and P. Marinos and G. Martí-Devesa and R. Marx and A. Mehta and A. Mitchell and R. Moderski and L. Mohrmann and A. Montanari and E. Moulin and T. Murach and M. de Naurois and J. Niemiec and A. Priyana Noel and P. O'Brien and S. Ohm and L. Olivera-Nieto and E. de Ona Wilhelmi and M. Ostrowski and S. Panny and M. Panter and R. D. Parsons and D. A. Prokhorov and G. Pühlhofer and M. Punch and A. Quirrenbach and M. Regeard and P. Reichherzer and A. Reimer and O. Reimer and H. Ren and M. Renaud and B. Reville and F. Rieger and G. Roellinghoff and B. Rudak and V. Sahakian and H. Salzmann and M. Sasaki and F. Schüssler and H. M. Schutte and J. N. S. Shapopi and A. Specovius and S. Spencer and R. Steenkamp and S. Steinmassl and C. Steppa and I. Sushch and H. Suzuki and T. Takahashi and T. Tanaka and R. Terrier and M. Tluczykont and N. Tsuji and T. Unbehaun and C. van Eldik and M. Vecchi and J. Veh and C. Venter and J. Vink and T. Wach and S. J. Wagner and A. Wierzcholska and M. Zacharias and D. Zargaryan and A. A. Zdziarski and S. Zouari and N. Żywucka},
journal= {arXiv preprint arXiv:2403.16802},
year = {2024}
}
Comments
13+5 pages, 13+11 figures. Accepted for publication in A&A. Corresponding authors: T.Wach, A.Mitchell, V.Joshi, P.Chamb\'ery