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Search for Dark Matter Annihilation Signals from Unidentified Fermi-LAT Objects with H.E.S.S

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posted on 2021-11-05, 09:50 authored by H Abdalla, F Aharonian, F Ait Benkhali, EO Anguner, C Arcaro, C Armand, T Armstrong, H Ashkar, M Backes, V Baghmanyan, V Barbosa-Martins, A Barnacka, M Barnard, Y Becherini, D Berge, K Bernloehr, B Bi, M Bottcher, C Boisson, J Bolmont, M de Bony de Lavergne, M Breuhaus, R Brose, F Brun, T Bulik, T Bylund, F Cangemi, S Caroff, S Casanova, P Chambery, J Catalano, T Chand, A Chen, G Cotter, M Curylo, H Dalgleish, J Damascene Mbarubucyeye, ID Davids, J Davies, J Devin, A Djannati-Atai, A Dmytriiev, A Donath, V Doroshenko, L Dreyer, L du Plessis, C Duffy, K Egberts, S Einecke, G Emery, J-P Ernenwein, K Feijen, S Fegan, A Fiasson, G Fichet de Clairfontaine, G Fontaine, S Funk, M Fuessling, S Gabici, YA Gallant, S Ghafourizade, G Giavitto, L Giunti, D Glawion, JF Glicenstein, M-H Grondin, S Hattingh, M Haupt, G Hermann, JA Hinton, W Hofmann, C Hoischen, TL Holch, M Holler, M Horbe, D Horns, Z Huang, D Huber, M Jamrozy, D Jankowsky, F Jankowsky, V Joshi, I Jung-Richardt, E Kasai, K Katarzynski, U Katz, D Khangulyan, B Khelifi, S Klepser, W Kluzniak, Nu Komin, R Konno, K Kosack, D Kostunin, M Kreter, G Kukec Mezek, A Kundu, G Lamanna, S Le Stum, A Lemiere, M Lemoine-Goumard, J-P Lenain, F Leuschner, C Levy, A Luashvili, T Lohse, I Lypova, J Mackey, J Majumdar, D Malyshev, V Marandon, P Marchegiani, A Marcowith, A Mares, G Marti-Devesa, R Marx, G Maurin, PJ Meintjes, M Meyer, A Mitchell, R Moderski, L Mohrmann, A Montanari, C Moore, P Morris, E Moulin, J Muller, T Murach, K Nakashima, A Nayerhoda, M de Naurois, H Ndiyavala, J Niemiec, A Noel, L Oberholzer, P O'Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, M Panter, S Panny, RD Parsons, G Peron, S Pita, V Poireau, DA Prokhorov, H Prokoph, G Puhlhoefer, M Punch, A Quirrenbach, P Reichherzer, A Reimer, O Reimer, Q Remy, M Renaud, F Rieger, C Romoli, G Rowell, B Rudak, H Rueda Ricarte, E Ruiz-Velasco, V Sahakian, S Sailer, H Salzmann, DA Sanchez, A Santangelo, M Sasaki, J Schaefer, F Schussler, HM Schutte, U Schwanke, M Senniappan, AS Seyffert, JNS Shapopi, K Shiningayamwe, R Simoni, A Sinha, H Spackman, H Sol, A Specovius, S Spencer, M Spir-Jacob, L Stawarz, L Sun, R Steenkamp, C Stegmann, S Steinmassl, C Steppa, T Takahashi, T Tanaka, T Tavernier, AM Taylor, R Terrier, C Thorpe-Morgan, JHE Thiersen, M Tluczykont, L Tomankova, M Tsirou, M Tsuji, R Tuffs, Y Uchiyama, DJ van der Walt, C van Eldik, C van Rensburg, B van Soelen, G Vasileiadis, J Veh, C Venter, P Vincent, A Viana, J Vink, HJ Voelk, SJ Wagner, F Werner, R White, A Wierzcholska, Yu Wun Wong, H Yassin, A Yusafzai, M Zacharias, R Zanin, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, A Zmija, J Zorn, S Zouari, N Zywucka
Cosmological N-body simulations show that Milky Way-sized galaxies harbor a population of unmerged dark matter (DM) subhalos. These subhalos could shine in gamma-rays and eventually be detected in gamma-ray surveys as unidentified sources. We performed a thorough selection among unidentified Fermi-Large Area Telescope Objects (UFOs) to identify them as possible tera-electron-volt-scale DM subhalo candidates. We search for very-high-energy (E ⪆ 100 GeV) gamma-ray emissions using H.E.S.S. observations toward four selected UFOs. Since no significant very-high-energy gamma-ray emission is detected in any data set of the four observed UFOs or in the combined UFO data set, strong constraints are derived on the product of the velocity-weighted annihilation cross section σ v by the J factor for the DM models. The 95% confidence level observed upper limits derived from combined H.E.S.S. observations reach σ vJ values of 3.7 ? 10-5 and 8.1 ? 10-6 GeV2 cm-2 s-1 in the W + W - and τ + τ - channels, respectively, for a 1 TeV DM mass. Focusing on thermal weakly interacting massive particles, the H.E.S.S. constraints restrict the J factors to lie in the range 6.1 ? 1019-2.0 ? 1021 GeV2 cm-5 and the masses to lie between 0.2 and 6 TeV in the W + W - channel. For the τ + τ - channel, the J factors lie in the range 7.0 ? 1019-7.1 ? 1020 GeV2 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 DM models with masses >0.3 TeV for the UFO emissions can be ruled out at high confidence level.

History

Citation

2021 ApJ 918 17

Author affiliation

Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

The Astrophysical Journal

Volume

918

Issue

1

Pagination

17

Publisher

American Astronomical Society

issn

0004-637X

eissn

1538-4357

Acceptance date

2021-05-08

Copyright date

2021

Available date

2022-08-30

Language

English

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