학술논문
Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S
Document Type
Working Paper
Author
Collaboration, H. E. S. S.; Abdallah, H.; Aharonian, F.; Benkhali, F. Ait; Angüner, E. O.; Arcaro, C.; Armand, C.; Armstrong, T.; Ashkar, H.; Backes, M.; Baghmanyan, V.; Martins, V. Barbosa; Barnacka, A.; Barnard, M.; Becherini, Y.; Berge, D.; Bernlöhr, K.; Bi, B.; Böttcher, M.; Boisson, C.; Bolmont, J.; de Lavergne, M. de Bony; Breuhaus, M.; Brose, R.; Brun, F.; Bulik, T.; Bylund, T.; Cangemi, F.; Caroff, S.; Casanova, S.; Chambery, P.; Chand, J. Catalano T.; Chen, A.; Cotter, G.; Curylo, M.; Dalgleish, H.; Mbarubucyeye, J. Damascene; Davids, I. D.; Davies, J.; Devin, J.; Djannati-Ataï, A.; Dmytriiev, A.; Donath, A.; Doroshenko, V.; Dreyer, L.; Plessis, L. Du; Duffy, C.; Egberts, K.; Einecke, S.; Emery, G.; Ernenwein, J. -P.; Feijen, K.; Fegan, S.; Fiasson, A.; de Clairfontaine, G. Fichet; Fontaine, G.; Funk, S.; Füßling, M.; Gabici, S.; Gallant, Y. A.; Giavitto, G.; Giunti, L.; Glawion, D.; Glicenstein, J. F.; Grondin, M. -H.; Hattingh, S.; Haupt, M.; Hermann, G.; Hinton, J. A.; Hofmann, W.; Hoischen, C.; Holch, T. L.; Holler, M.; Hörbe, M.; Horns, D.; Huang, Z.; Huber, D.; Jamrozy, M.; Jankowsky, D.; Jankowsky, F.; Joshi, V.; Jung-Richardt, I.; Kasai, E.; Katarzyński, K.; Katz, U.; Khangulyan, D.; Khèlifi, B.; Klepser, S.; Kluzniak, W.; Komin, Nu.; Konno, R.; Kosack, K.; Kostunin, D.; Kreter, M.; Mezek, G. Kukec; Kundu, A.; Lamanna, G.; Stum, S. Le; Lemière, A.; Lemoine-Goumard, M.; Lenain, J. -P.; Leuschner, F.; Levy, C.; Lohse, T.; Luashvili, A.; Lypova, I.; Mackey, J.; Majumdar, J.; Malyshev, D.; Marandon, V.; Marchegiani, P.; Marcowith, A.; Mares, A.; Martì-Devesa, G.; Marx, R.; Maurin, G.; Meintjes, P. J.; Meyer, M.; Mitchell, A.; Moderski, R.; Mohrmann, L.; Montanari, A.; Moore, C.; Morris, P.; Moulin, E.; Muller, J.; Murach, T.; Nakashima, K.; Nayerhoda, A.; de Naurois, M.; Ndiyavala, H.; Niemiec, J.; Noel, A.; Oberholzer, L.; O'Brien, P.; Ohm, S.; Olivera-Nieto, L.; Wilhelmi, E. de Ona; Ostrowski, M.; Panter, M.; Panny, S.; Parsons, R. D.; Peron, G.; Pita, S.; Poireau, V.; Prokhorov, D. A.; Prokoph, H.; Pühlhofer, G.; Punch, M.; Quirrenbach, A.; Reichherzer, P.; Reimer, A.; Reimer, O.; Remy, Q.; Renaud, M.; Rieger, F.; Romoli, C.; Rowell, G.; Rudak, B.; Ricarte, H. Rueda; Ruiz-Velasco, E.; Sahakian, V.; Sailer, S.; Salzmann, H.; Sanchez, D. A.; Santangelo, A.; Sasaki, M.; Schüssler, F.; Schutte, H. M.; Schwanke, U.; Senniappan, M.; Seyffert, A. S.; Shapopi, J. N. S.; Shiningayamwe, K.; Simoni, R.; Sinha, A.; Sol, H.; Spackman, H.; Specovius, A.; Spencer, S.; Spir-Jacob, M.; Stawarz, L.; Sun, L.; Steenkamp, R.; Stegmann, C.; Steinmassl, S.; Steppa, C.; Takahashi, T.; Tanaka, T.; Tavernier, T.; Taylor, A. M.; Terrier, R.; Morgan, C. Thorpe; Thiersen, J. H. E.; Tluczykont, M.; Tomankova, L.; Trichard, C.; Tsirou, M.; Tsuji, M.; Tuffs, R.; Uchiyama, Y.; van der Walt, D. J.; van Eldik, C.; van Rensburg, C.; van Soelen, B.; Vasileiadis, G.; Veh, J.; Venter, C.; Viana, A.; Vincent, P.; Vink, J.; Völk, H. J.; Wagner, S. J.; Werner, F.; White, R.; Wierzcholska, A.; Wong, Yu Wun; Yassin, H.; Yusafzai, A.; Zacharias, M.; Zanin, R.; Zargaryan, D.; Zdziarski, A. A.; Zech, A.; Zhu, S.; Zmija, A.; Zorn, J.; Zouari, S.; Zywucka, N.
Source
Astrophys.J., 918, 17 (2021)
Subject
Language
Abstract
Cosmological $N$-body simulations show that Milky Way-sized galaxies harbor a population of unmerged dark matter subhalos. These subhalos could shine in gamma-rays and be eventually detected in gamma-ray surveys as unidentified sources. We performed a thorough selection among unidentified Fermi-LAT Objects (UFOs) to identify them as possible TeV-scale dark matter subhalo candidates. We search for very-high-energy (E $\gtrsim$ 100 GeV) gamma-ray emissions using H.E.S.S. observations towards four selected UFOs. Since no significant very-high-energy gamma-ray emission is detected in any dataset of the four observed UFOs nor in the combined UFO dataset, strong constraints are derived on the product of the velocity-weighted annihilation cross section $\langle \sigma v \rangle$ by the $J$-factor for the dark matter models. The 95% C.L. observed upper limits derived from combined H.E.S.S. observations reach $\langle \sigma v \rangle J$ values of 3.7$\times$10$^{-5}$ and 8.1$\times$10$^{-6}$ GeV$^2$cm$^{-2}$s$^{-1}$ in the $W^+W^-$ and $\tau^+\tau^-$ channels, respectively, for a 1 TeV dark matter mass. Focusing on thermal WIMPs, the H.E.S.S. constraints restrict the $J$-factors to lie in the range 6.1$\times$10$^{19}$ - 2.0$\times$10$^{21}$ GeV$^2$cm$^{-5}$, and the masses to lie between 0.2 and 6 TeV in the $W^+W^-$ channel. For the $\tau^+\tau^-$ channel, the $J$-factors lie in the range 7.0$\times$10$^{19}$ - 7.1$\times$10$^{20}$ GeV$^2$cm$^{-5}$ and the masses lie between 0.2 and 0.5 TeV. Assuming model-dependent predictions from cosmological N-body simulations on the $J$-factor distribution for Milky Way-sized galaxies, the dark matter models with masses greater than 0.3 TeV for the UFO emissions can be ruled out at high confidence level.
Comment: 11 pages, 7 figures, matches accepted version in The Astrophysical Journal
Comment: 11 pages, 7 figures, matches accepted version in The Astrophysical Journal