Search for dark matter annihilation line signals with the H.E.S.S. Inner Galaxy Survey

H.E.S.S. Collaboration

Search for dark matter annihilation line signals with the H.E.S.S. Inner Galaxy Survey

H.E.S.S. Collaboration

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

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

Abstract

Astrophysical and cosmological measurements suggest that non-baryonic dark matter dominates the matter content of the Universe. However, its underlying nature remains elusive. Among the most promising candidates are weakly interacting massive particles (WIMPs): particles with mass and coupling strength at the electroweak scale and thermally produced in the early universe having a present relic density consistent with that observed today. WIMP self-annihilation could produce Standard Model particles, including gamma-rays, which have been long-time recognized as a prime messenger to indirectly detect dark matter signals. Line-like features expected in the gamma-ray spectra from WIMP self-annihilation provide a key signature for TeV-scale particle dark matter. The centre of the Milky Way is predicted as the brightest source of DM annihilations. The H.E.S.S. collaboration is currently performing a survey of the inner region of the Milky Way, the Inner Galaxy Survey (IGS). We analyzed 2014-2020 observations taken with the five-telescope array to search for a DM line annihilation signal. With the current dataset of 546 hours, we found no significant excess and therefore derived strong constraints on the velocity-weighted annihilation cross-section into two gammas. Our limits significantly improve the current constraints, opening the possibility of constraining canonical thermal Dark Matter models with prominent line contribution in their annihilation spectra, as expected in the Wino and Higgsino cases.

Original language	English
Article number	1424
Journal	Proceedings of Science
Volume	444
Publication status	Published - 27 Sept 2024
Event	38th International Cosmic Ray Conference, ICRC 2023 - Nagoya, Japan Duration: 26 Jul 2023 → 3 Aug 2023

Cite this

@article{635013c255184be691ac550e8348995a,

title = "Search for dark matter annihilation line signals with the H.E.S.S. Inner Galaxy Survey",

abstract = "Astrophysical and cosmological measurements suggest that non-baryonic dark matter dominates the matter content of the Universe. However, its underlying nature remains elusive. Among the most promising candidates are weakly interacting massive particles (WIMPs): particles with mass and coupling strength at the electroweak scale and thermally produced in the early universe having a present relic density consistent with that observed today. WIMP self-annihilation could produce Standard Model particles, including gamma-rays, which have been long-time recognized as a prime messenger to indirectly detect dark matter signals. Line-like features expected in the gamma-ray spectra from WIMP self-annihilation provide a key signature for TeV-scale particle dark matter. The centre of the Milky Way is predicted as the brightest source of DM annihilations. The H.E.S.S. collaboration is currently performing a survey of the inner region of the Milky Way, the Inner Galaxy Survey (IGS). We analyzed 2014-2020 observations taken with the five-telescope array to search for a DM line annihilation signal. With the current dataset of 546 hours, we found no significant excess and therefore derived strong constraints on the velocity-weighted annihilation cross-section into two gammas. Our limits significantly improve the current constraints, opening the possibility of constraining canonical thermal Dark Matter models with prominent line contribution in their annihilation spectra, as expected in the Wino and Higgsino cases.",

author = "\{H.E.S.S. Collaboration\} and Emmanuel Moulin and Alessandro Montanari and F. Aharonian and \{Ait Benkhali\}, F. and A. Alkan and J. Aschersleben and H. Ashkar and M. Backes and A. Baktash and \{Barbosa Martins\}, V. and A. Barnacka and J. Barnard and R. Batzofin and Y. Becherini and G. Beck 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 J. Borowska and M. Bouyahiaoui and F. Bradascio and M. Breuhaus and R. Brose and A. Brown and F. Brun and B. Bruno and T. Bulik and C. Burger-Scheidlin and T. Bylund and F. Cangemi and S. Caroff and S. Casanova and R. Cecil and J. Celic and M. Cerruti and P. Chambery and T. Chand and S. Chandra and A. Chen and J. Chibueze and O. Chibueze and T. Collins and G. Cotter and P. Cristofari and \{Damascene Mbarubucyeye\}, J. and S. Fegan",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons.; 38th International Cosmic Ray Conference, ICRC 2023 ; Conference date: 26-07-2023 Through 03-08-2023",

year = "2024",

month = sep,

day = "27",

language = "English",

volume = "444",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - Search for dark matter annihilation line signals with the H.E.S.S. Inner Galaxy Survey

AU - H.E.S.S. Collaboration

AU - Moulin, Emmanuel

AU - Montanari, Alessandro

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Alkan, A.

AU - Aschersleben, J.

AU - Ashkar, H.

AU - Backes, M.

AU - Baktash, A.

AU - Barbosa Martins, V.

AU - Barnacka, A.

AU - Barnard, J.

AU - Batzofin, R.

AU - Becherini, Y.

AU - Beck, G.

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 - Borowska, J.

AU - Bouyahiaoui, M.

AU - Bradascio, F.

AU - Breuhaus, M.

AU - Brose, R.

AU - Brown, A.

AU - Brun, F.

AU - Bruno, B.

AU - Bulik, T.

AU - Burger-Scheidlin, C.

AU - Bylund, T.

AU - Cangemi, F.

AU - Caroff, S.

AU - Casanova, S.

AU - Cecil, R.

AU - Celic, J.

AU - Cerruti, M.

AU - Chambery, P.

AU - Chand, T.

AU - Chandra, S.

AU - Chen, A.

AU - Chibueze, J.

AU - Chibueze, O.

AU - Collins, T.

AU - Cotter, G.

AU - Cristofari, P.

AU - Damascene Mbarubucyeye, J.

AU - Fegan, S.

PY - 2024/9/27

Y1 - 2024/9/27

N2 - Astrophysical and cosmological measurements suggest that non-baryonic dark matter dominates the matter content of the Universe. However, its underlying nature remains elusive. Among the most promising candidates are weakly interacting massive particles (WIMPs): particles with mass and coupling strength at the electroweak scale and thermally produced in the early universe having a present relic density consistent with that observed today. WIMP self-annihilation could produce Standard Model particles, including gamma-rays, which have been long-time recognized as a prime messenger to indirectly detect dark matter signals. Line-like features expected in the gamma-ray spectra from WIMP self-annihilation provide a key signature for TeV-scale particle dark matter. The centre of the Milky Way is predicted as the brightest source of DM annihilations. The H.E.S.S. collaboration is currently performing a survey of the inner region of the Milky Way, the Inner Galaxy Survey (IGS). We analyzed 2014-2020 observations taken with the five-telescope array to search for a DM line annihilation signal. With the current dataset of 546 hours, we found no significant excess and therefore derived strong constraints on the velocity-weighted annihilation cross-section into two gammas. Our limits significantly improve the current constraints, opening the possibility of constraining canonical thermal Dark Matter models with prominent line contribution in their annihilation spectra, as expected in the Wino and Higgsino cases.

AB - Astrophysical and cosmological measurements suggest that non-baryonic dark matter dominates the matter content of the Universe. However, its underlying nature remains elusive. Among the most promising candidates are weakly interacting massive particles (WIMPs): particles with mass and coupling strength at the electroweak scale and thermally produced in the early universe having a present relic density consistent with that observed today. WIMP self-annihilation could produce Standard Model particles, including gamma-rays, which have been long-time recognized as a prime messenger to indirectly detect dark matter signals. Line-like features expected in the gamma-ray spectra from WIMP self-annihilation provide a key signature for TeV-scale particle dark matter. The centre of the Milky Way is predicted as the brightest source of DM annihilations. The H.E.S.S. collaboration is currently performing a survey of the inner region of the Milky Way, the Inner Galaxy Survey (IGS). We analyzed 2014-2020 observations taken with the five-telescope array to search for a DM line annihilation signal. With the current dataset of 546 hours, we found no significant excess and therefore derived strong constraints on the velocity-weighted annihilation cross-section into two gammas. Our limits significantly improve the current constraints, opening the possibility of constraining canonical thermal Dark Matter models with prominent line contribution in their annihilation spectra, as expected in the Wino and Higgsino cases.

M3 - Conference article

AN - SCOPUS:85212277728

SN - 1824-8039

VL - 444

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 1424

T2 - 38th International Cosmic Ray Conference, ICRC 2023

Y2 - 26 July 2023 through 3 August 2023

ER -

Search for dark matter annihilation line signals with the H.E.S.S. Inner Galaxy Survey

Abstract

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