HESS J1809-193: A halo of escaped electrons around a pulsar wind nebula?

Aharonian F, Ait Benkhali F, Aschersleben J, Ashkar H, Backes M, Barbosa Martins V, Batzofin R, Becherini Y, Berge D, Boettcher M, Boisson C, Bolmont J, Borowska J, Bouyahiaoui M, Bradascio F, Breuhaus M, Brose R, Brun F, Bruno B, Bulik T, Burger-Scheidlin C, Bylund T, Caroff S, Casanova S, Celic J, Cerruti M, Chambery P, Chand T, Chen A, Chibueze J, Chibueze O, Damascene Mbarubucyeye J, Djannati-Atai A, Dmytriiev A, Einecke S, Ernenwein JP, Feijen K, Filipovic M, Fontaine G, Fuessling M, Funk S, Gabici S, Gallant YA, Ghafourizadeh S, Giavitto G, Giunti L, Glawion D, Goswami P, Grolleron G, Grondin MH, Haerer L, Hinton JA, Hofmann W, Holch TL, Holler M, Horns D, Huang Z, Jamrozy M, Jankowsky F, Joshi V, Jung-Richardt I, Kasai E, Katarzynski K, Khelifi B, Kluzniak W, Komin N, Kosack K, Kostunin D, Lang RG, Le Stum S, Leitl F, Lemiere A, Lemoine-Goumard M, Lenain JP, Leuschner F, Lohse T, Luashvili A, Lypova I, Mackey J, Malyshev D, Marandon V, Marchegiani P, Marcowith A, Marinos P, Marti-Devesa G, Marx R, Mitchell A, Moderski R, Mohrmann L, Montanari A, Moulin E, Muller J, Nakashima K, De Naurois M, Niemiec J, Priyana Noel A, Ohm S, Olivera-Nieto L, De Ona Wilhelmi E, Ostrowski M, Panny S, Panter M, Parsons RD, Prokhorov DA, Puehlhofer G, Punch M, Quirrenbach A, Reichherzer P, Reimer A, Reimer O, Renaud M, Reville B, Rieger F, Rowell G, Rudak B, Sahakian V, Santangelo A, Sasaki M, Schutte HM, Schwanke U, Shapopi JNS, Sol H, Specovius A, Spencer S, Stawarz L, Steenkamp R, Steinmassl S, Sushch I, Suzuki H, Takahashi T, Tanaka T, Terrier R, Thorpe-Morgan C, Tsirou M, Tsuji N, Uchiyama Y, van Eldik C, Vecchi M, Veh J, Venter C, Vink J, Wach T, Wagner SJ, White R, Wierzcholska A, Wong YW, Zacharias M, Zargaryan D, Zdziarski AA, Zech A, Zouari S, Zywucka N (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Book Volume: 672

DOI: 10.1051/0004-6361/202245459

Abstract

Context. HESS J1809-193 is an unassociated very-high-energy gamma-ray source located on the Galactic plane. While it has been connected to the nebula of the energetic pulsar PSR J1809-1917, supernova remnants and molecular clouds present in the vicinity also constitute possible associations. Recently, the detection of gamma-ray emission up to energies of similar to 100 TeV with the HAWC observatory has led to renewed interest in HESS J1809-193.Aims. We aim to understand the origin of the gamma-ray emission of HESS J1809-193.Methods. We analysed 93.2 h of data taken on HESS J1809-193 above 0.27 TeV with the High Energy Stereoscopic System (H.E.S.S.), using a multi-component, three-dimensional likelihood analysis. In addition, we provide a new analysis of 12.5 yr of Fermi-LAT data above 1 GeV within the region of HESS J1809-193. The obtained results are interpreted in a time-dependent modelling framework.Results. For the first time, we were able to resolve the emission detected with H.E.S.S. into two components: an extended component (modelled as an elongated Gaussian with a 1-sigma semi-major and semi-minor axis of similar to 0.62 degrees and similar to 0.35 degrees, respectively) that exhibits a spectral cutoff at similar to 13 TeV, and a compact component (modelled as a symmetric Gaussian with a 1-sigma radius of similar to 0.1 degrees) that is located close to PSR J1809-1917 and shows no clear spectral cutoff. The Fermi-LAT analysis also revealed extended gamma-ray emission, on scales similar to that of the extended H.E.S.S. component.Conclusions. Our modelling indicates that based on its spectrum and spatial extent, the extended H.E.S.S. component is likely caused by inverse Compton emission from old electrons that form a halo around the pulsar wind nebula. The compact component could be connected to either the pulsar wind nebula or the supernova remnant and molecular clouds. Due to its comparatively steep spectrum, modelling the Fermi-LAT emission together with the H.E.S.S. components is not straightforward.

Authors with CRIS profile

Involved external institutions

Max-Planck-Institut für Kernphysik (MPIK) / Max Planck Institute for Nuclear Physics Germany (DE) Université de Paris France (FR) University of Paris 4 - Paris-Sorbonne / Université paris IV Paris-Sorbonne France (FR) Nicolaus Copernicus University (NCU) / Uniwersytet Mikołaja Kopernika w Toruniu (UMK) Poland (PL) Rikkyo University / 立教大学 Japan (JP) University of Namibia (UNAM) Namibia (NA) University of Montpellier / Université Montpellier France (FR) Noordwes-Universiteit / North-West University South Africa (ZA) Jagiellonian University / Uniwersytet Jagielloński (UJ) Poland (PL) Deutsches Elektronen-Synchrotron DESY Germany (DE) Leopold-Franzens-Universität Innsbruck / University of Innsbruck Austria (AT) Institut national de physique nucléaire et de physique des particules (IN2P3) France (FR) University of the Witwatersrand (WITS) South Africa (ZA) École Polytechnique - Université Paris-Saclay France (FR) Ruprecht-Karls-Universität Heidelberg Germany (DE) Aix-Marseille University / Aix-Marseille Université France (FR) Universität Hamburg (UHH) Germany (DE) Konan University / 甲南大学 Japan (JP) Polska Akademia Nauk (PAN) / Polish Academy of Sciences Poland (PL) Riken Institute of Physical and Chemical Research / 理研 Japan (JP) Institute of Nuclear Physics PAN / Instytut Fizyki Jądrowej im. Henryka Niewodniczańskiego PAN Poland (PL) University of Groningen / Rijksuniversiteit Groningen Netherlands (NL) Eberhard Karls Universität Tübingen Germany (DE) University of Savoy Mont Blanc / Université Savoie Mont Blanc France (FR) University of Amsterdam Netherlands (NL) University of Western Sydney Australia (AU) University of Adelaide Australia (AU) Dublin Institute for Advanced Studies (DIAS) Ireland (IE) Humboldt-Universität zu Berlin Germany (DE) Linnaeus University (LNU) / Linnéuniversitetet Sweden (SE) University of Tokyo Japan (JP) University of Warsaw / Uniwersytet Warszawski Poland (PL) Yerevan Physics Institute (YerPhI) / Երևանի Ֆիզիկայի Ինստիտուտ Armenia (AM)

How to cite

APA:

Aharonian, F., Ait Benkhali, F., Aschersleben, J., Ashkar, H., Backes, M., Barbosa Martins, V.,... Zywucka, N. (2023). HESS J1809-193: A halo of escaped electrons around a pulsar wind nebula? Astronomy & Astrophysics, 672. https://dx.doi.org/10.1051/0004-6361/202245459

MLA:

Aharonian, F., et al. "HESS J1809-193: A halo of escaped electrons around a pulsar wind nebula?" Astronomy & Astrophysics 672 (2023).

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