Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S.

H.E.S.S. Collaboration

Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S.

H.E.S.S. Collaboration

University of Tübingen
Université Paris-Saclay
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
University of Namibia
Dublin Institute for Advanced Studies
Max-Planck-Institut für Kernphysik
Russian-Armenian University
Aix-Marseille Université
North-West University
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
University of Oxford
Institute for Nuclear Physics
c/o DESY
Jagiellonian University
University of the Witwatersrand, Johannesburg
Linnaeus University, Växjö
LUTH - Laboratoire de l'Univers et de ses Theories
Sorbonne Université
University of Warsaw
UMR 5797
Astroparticule and Cosmol APC
University of Leicester
University of Potsdam
University of Adelaide
Ip Paris
Laboratoire Univers et Particules de Montpellier
University of Innsbruck
Universität Hamburg
Landessternwarte Heidelberg
Nicolaus Copernicus University
Rikkyo University
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Humboldt-Universität zu Berlin
University of the Free State
University of Amsterdam
Yerevan Physics Institute

Research output: Contribution to journal › Conference article › peer-review

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 search for very-high-energy (VHE, E ≥ 100 GeV) gamma-ray emission using H.E.S.S. observations carried out from a thorough selection of unidentified Fermi-LAT Objects (UFOs) as dark matter subhalo candidates. Provided that the dark matter mass is higher than a few hundred GeV, the emission of the UFOs can be well described by dark matter annihilation models. No significant VHE gamma-ray emission is detected in any UFO dataset nor in their combination. We, therefore, derive constraints on the product of the velocity-weighted annihilation cross-section hσυi by the J-factor on dark matter models describing the UFO emissions. Upper limits at 95% confidence level are derived on hσυiJ in W^+W− and τ^+τ− annihilation channels for the TeV dark matter particles. Focusing on thermal WIMPs, strong constraints on the J-factors are obtained from H.E.S.S. observations. Adopting model-dependent predictions from cosmological N-body simulations on the J-factor distribution function for Milky Way (MW)-sized galaxies, only . 0.3 TeV mass dark matter models marginally allow to explain observed UFO emission.

Original language	English
Article number	538
Journal	Proceedings of Science
Volume	395
Publication status	Published - 18 Mar 2022
Event	37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany Duration: 12 Jul 2021 → 23 Jul 2021

Cite this

@article{0d9917d27bfa449c99565cba43316c7a,

title = "Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S.",

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 search for very-high-energy (VHE, E ≥ 100 GeV) gamma-ray emission using H.E.S.S. observations carried out from a thorough selection of unidentified Fermi-LAT Objects (UFOs) as dark matter subhalo candidates. Provided that the dark matter mass is higher than a few hundred GeV, the emission of the UFOs can be well described by dark matter annihilation models. No significant VHE gamma-ray emission is detected in any UFO dataset nor in their combination. We, therefore, derive constraints on the product of the velocity-weighted annihilation cross-section hσυi by the J-factor on dark matter models describing the UFO emissions. Upper limits at 95\% confidence level are derived on hσυiJ in W+W− and τ+τ− annihilation channels for the TeV dark matter particles. Focusing on thermal WIMPs, strong constraints on the J-factors are obtained from H.E.S.S. observations. Adopting model-dependent predictions from cosmological N-body simulations on the J-factor distribution function for Milky Way (MW)-sized galaxies, only . 0.3 TeV mass dark matter models marginally allow to explain observed UFO emission.",

author = "\{H.E.S.S. Collaboration\} and D. Malyshev and A. Montanari and E. Moulin and D. Glawion and H. Abdalla and F. Aharonian and \{Ait Benkhali\}, F. and Ang{\"u}ner, \{E. O.\} and C. Arcaro and C. Armand and T. Armstrong and H. Ashkar and M. Backes and V. Baghmanyan and \{Barbosa Martins\}, V. and A. Barnacka and M. Barnard and R. Batzofin and Y. Becherini and D. Berge and K. Bernl{\"o}hr and B. Bi and M. B{\"o}ttcher and C. Boisson and J. Bolmont and \{de Bony de Lavergne\}, M. and M. Breuhaus and R. Brose and F. Brun and T. Bulik and T. Bylund and F. Cangemi and S. Caroff and S. Casanova and J. Catalano and P. Chambery and T. Chand and A. Chen and G. Cotter and M. Cury{\l}o and \{Damascene Mbarubucyeye\}, J. and Davids, \{I. D.\} and J. Davies and J. Devin and A. Djannati-Ata{\"i} and A. Dmytriiev and A. Donath and V. Doroshenko and L. Dreyer and S. Fegan",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).; 37th International Cosmic Ray Conference, ICRC 2021 ; Conference date: 12-07-2021 Through 23-07-2021",

year = "2022",

month = mar,

day = "18",

language = "English",

volume = "395",

journal = "Proceedings of Science",

issn = "1824-8039",

}

TY - JOUR

T1 - Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S.

AU - H.E.S.S. Collaboration

AU - Malyshev, D.

AU - Montanari, A.

AU - Moulin, E.

AU - Glawion, D.

AU - Abdalla, H.

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Angüner, E. O.

AU - Arcaro, C.

AU - Armand, C.

AU - Armstrong, T.

AU - Ashkar, H.

AU - Backes, M.

AU - Baghmanyan, V.

AU - Barbosa Martins, V.

AU - Barnacka, A.

AU - Barnard, M.

AU - Batzofin, R.

AU - Becherini, Y.

AU - Berge, D.

AU - Bernlöhr, K.

AU - Bi, B.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - de Bony de Lavergne, M.

AU - Breuhaus, M.

AU - Brose, R.

AU - Brun, F.

AU - Bulik, T.

AU - Bylund, T.

AU - Cangemi, F.

AU - Caroff, S.

AU - Casanova, S.

AU - Catalano, J.

AU - Chambery, P.

AU - Chand, T.

AU - Chen, A.

AU - Cotter, G.

AU - Curyło, M.

AU - Damascene Mbarubucyeye, J.

AU - Davids, I. D.

AU - Davies, J.

AU - Devin, J.

AU - Djannati-Ataï, A.

AU - Dmytriiev, A.

AU - Donath, A.

AU - Doroshenko, V.

AU - Dreyer, L.

AU - Fegan, S.

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

PY - 2022/3/18

Y1 - 2022/3/18

N2 - 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 search for very-high-energy (VHE, E ≥ 100 GeV) gamma-ray emission using H.E.S.S. observations carried out from a thorough selection of unidentified Fermi-LAT Objects (UFOs) as dark matter subhalo candidates. Provided that the dark matter mass is higher than a few hundred GeV, the emission of the UFOs can be well described by dark matter annihilation models. No significant VHE gamma-ray emission is detected in any UFO dataset nor in their combination. We, therefore, derive constraints on the product of the velocity-weighted annihilation cross-section hσυi by the J-factor on dark matter models describing the UFO emissions. Upper limits at 95% confidence level are derived on hσυiJ in W+W− and τ+τ− annihilation channels for the TeV dark matter particles. Focusing on thermal WIMPs, strong constraints on the J-factors are obtained from H.E.S.S. observations. Adopting model-dependent predictions from cosmological N-body simulations on the J-factor distribution function for Milky Way (MW)-sized galaxies, only . 0.3 TeV mass dark matter models marginally allow to explain observed UFO emission.

AB - 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 search for very-high-energy (VHE, E ≥ 100 GeV) gamma-ray emission using H.E.S.S. observations carried out from a thorough selection of unidentified Fermi-LAT Objects (UFOs) as dark matter subhalo candidates. Provided that the dark matter mass is higher than a few hundred GeV, the emission of the UFOs can be well described by dark matter annihilation models. No significant VHE gamma-ray emission is detected in any UFO dataset nor in their combination. We, therefore, derive constraints on the product of the velocity-weighted annihilation cross-section hσυi by the J-factor on dark matter models describing the UFO emissions. Upper limits at 95% confidence level are derived on hσυiJ in W+W− and τ+τ− annihilation channels for the TeV dark matter particles. Focusing on thermal WIMPs, strong constraints on the J-factors are obtained from H.E.S.S. observations. Adopting model-dependent predictions from cosmological N-body simulations on the J-factor distribution function for Milky Way (MW)-sized galaxies, only . 0.3 TeV mass dark matter models marginally allow to explain observed UFO emission.

M3 - Conference article

AN - SCOPUS:85144617778

SN - 1824-8039

VL - 395

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 538

T2 - 37th International Cosmic Ray Conference, ICRC 2021

Y2 - 12 July 2021 through 23 July 2021

ER -

Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S.

Abstract

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