Detection of extended gamma-ray emission around the Geminga pulsar with H.E.S.S
Creators: name: Collaboration, H. E. S. S.
name: :
name: Aharonian, F.
name: Benkhali, F. Ait
name: Aschersleben, J.
name: Ashkar, H.
name: Backes, M.
name: Martins, V. Barbosa
name: Batzofin, R.
name: Becherini, Y.
name: Berge, D.
name: Bernlöhr, K.
name: Bi, B.
name: Böttcher, M.
name: Boisson, C.
name: Bolmont, J.
name: Borowska, J.
name: Bouyahiaoui, M.
name: Bradascio, F.
name: Brose, R.
name: Brun, F.
name: Bruno, B.
name: Bulik, T.
name: Scheidlin, C. Burger
name: Cangemi, F.
name: Caroff, S.
name: Casanova, S.
name: Celic, J.
name: Cerruti, M.
name: Chambery, P.
name: Chand, T.
name: Chandra, S.
name: Chen, A.
name: Chibueze, J.
name: Chibueze, O.
name: Cotter, G.
name: Mbarubucyeye, J. Damascene
name: Devin, J.
name: Djannati-Ataï, A.
name: Dmytriiev, A.
name: Egberts, K.
name: Einecke, S.
name: Ernenwein, J. P.
name: Feijen, K.
name: de Clairfontaine, G. Fichet
name: Filipovic, M.
name: Fontaine, G.
name: Füssling, M.
name: Funk, S.
name: Gabici, S.
name: Gallant, Y. A.
name: Ghafourizadeh, S.
name: Giavitto, G.
name: Giunti, L.
name: Glawion, D.
name: Glicenstein, J. F.
name: Goswami, P.
name: Grolleron, G.
name: Grondin, M. -H.
name: Haerer, L.
name: Haupt, M.
name: Hermann, G.
name: Hinton, J. A.
name: Hofmann, W.
name: Holch, T. L.
name: Holler, M.
name: Horns, D.
name: Huang, Zhiqiu
name: Jamrozy, M.
name: Jankowsky, F.
name: Joshi, V.
name: Jung-Richardt, I.
name: Kasai, E.
name: Katarzyński, K.
name: Khélifi, B.
name: Kluźniak, W.
name: Komin, Nu.
name: Kosack, K.
name: Kostunin, D.
name: Lang, R. G.
name: Stum, S. Le
name: Leitl, F.
name: Lemière, A.
name: Lemoine-Goumard, M.
name: Lenain, J. -P.
name: Leuschner, F.
name: Lohse, T.
name: Luashvili, A.
name: Lypova, I.
name: Mackey, J.
name: Malyshev, D.
name: Marandon, V.
name: Marchegiani, P.
name: Marcowith, A.
name: Marinos, P.
name: Martí-Devesa, G.
name: Marx, R.
name: Maurin, G.
name: Meintjes, P. J.
name: Meyer, M.
name: Mitchell, A.
name: Moderski, R.
name: Mohrmann, L.
name: Montanari, A.
name: Moulin, E.
name: Muller, J.
name: Nakashima, K.
name: de Naurois, M.
name: Niemiec, J.
name: Noel, A. Priyana
name: O'Brien, P.
name: Ohm, S.
name: Olivera-Nieto, L.
name: Wilhelmi, E. de Ona
name: Ostrowski, M.
name: Panny, S.
name: Panter, M.
name: Parsons, R. D.
name: Peron, G.
name: Prokhorov, D. A.
name: Pühlhofer, G.
name: Quirrenbach, A.
name: Reimer, A.
name: Reimer, O.
name: Renaud, M.
name: Reville, B.
name: Rieger, F.
name: Rowell, G.
name: Rudak, B.
name: Ricarte, H. Rueda
name: Ruiz-Velasco, E.
name: Sahakian, V.
name: Salzmann, H.
name: Santangelo, A.
name: Sasaki, M.
name: Schüssler, F.
name: Schutte, H. M.
name: Schwanke, U.
name: Shapopi, J. N. S.
name: Sinha, A.
name: Sol, H.
name: Specovius, A.
name: Spencer, S.
name: Stawarz, Ł.
name: Steinmassl, S.
name: Sushch, I.
name: Suzuki, H.
name: Takahashi, T.
name: Tanaka, T.
name: Tavernier, T.
name: Taylor, A. M.
name: Terrier, R.
name: Thorpe-Morgan, C.
name: Tsirou, M.
name: Tsuji, N.
name: Vecchi, M.
name: Venter, C.
name: Vink, J.
name: Wagner, S. J.
name: White, R.
name: Wierzcholska, A.
name: Wong, Yu Wun
name: Zacharias, M.
name: Zargaryan, D.
name: Zdziarski, A. A.
name: Zech, A.
name: Zouari, S.
name: Żywucka, N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Geminga is an enigmatic radio-quiet gamma-ray pulsar located at a mere 250 pc distance from Earth. Extended very-high-energy gamma-ray emission around the pulsar was discovered by Milagro and later confirmed by HAWC, which are both water Cherenkov detector-based experiments. However, evidence for the Geminga pulsar wind nebula in gamma rays has long evaded detection by imaging atmospheric Cherenkov telescopes (IACTs) despite targeted observations. The detection of gamma-ray emission on angular scales &gt; 2 deg poses a considerable challenge for the background estimation in IACT data analysis. With recent developments in understanding the complementary background estimation techniques of water Cherenkov and atmospheric Cherenkov instruments, the H.E.S.S. IACT array can now confirm the detection of highly extended gamma-ray emission around the Geminga pulsar with a radius of at least 3 deg in the energy range 0.5-40 TeV. We find no indications for statistically significant asymmetries or energy-dependent morphology. A flux normalisation of $(2.8\pm0.7)\times10^{-12}$ cm$^{-2}$s$^{-1}$TeV$^{-1}$ at 1 TeV is obtained within a 1 deg radius region around the pulsar. To investigate the particle transport within the halo of energetic leptons around the pulsar, we fitted an electron diffusion model to the data. The normalisation of the diffusion coefficient obtained of $D_0 = 7.6^{+1.5}_{-1.2} \times 10^{27}$ cm$^2$s$^{-1}$, at an electron energy of 100 TeV, is compatible with values previously reported for the pulsar halo around Geminga, which is considerably below the Galactic average.
description: 16 pages, 15 figures, 7 tables. Accepted for publication in Astronomy &amp; Astrophysics