Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array

Michailidis, Miltiadis; Marafatto, Lorenzo; Malyshev, Denys; Iocco, Fabio; Zaharijas, Gabrijela; Sergijenko, Olga; Bernardos, Maria Isabel; Eckner, Christopher; Boyarsky, Alexey; Sokolenko, Anastasia; Santangelo, Andrea

doi:10.1088/1475-7516/2023/08/073

Title: Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array

Journal Article · Tue Aug 29 00:00:00 EDT 2023 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2023/08/073· OSTI ID:1983797

Michailidis, Miltiadis ^[1]; Marafatto, Lorenzo ^[2]; Malyshev, Denys ^[1];

^[3];

^[2]; Sergijenko, Olga ^[4]; Bernardos, Maria Isabel ^[5];

^[6];

^[7];

^[8]; Santangelo, Andrea ^[1]

University of Tubingen (Germany)
University of Nova Gorica (Slovenia)
Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy). Complesso Universitario di Monte S. Angelo
Taras Shevchenko National University of Kyiv (Ukraine); National Academy of Sciences of Ukraine (NASU), Kiev (Ukraine); AGH - University of Science and Technology, Krakow (Poland)
Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Univ. degli Studi di Padova (Italy)
University of Nova Gorica (Slovenia); Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTh), Centre National de la Recherche Scientifique (CNRS) and Université Savoie Mont Blanc (USMB), Annecy (France)
Leiden University (Netherlands)
University of Chicago, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Austrian Academy of Sciences, Vienna (Austria)

M31 and M33 are the closest spiral galaxies and the largest members (together with the Milky Way) of the Local group, which makes them interesting targets for indirect dark matter searches. In this paper we present studies of the expected sensitivity of the Cherenkov Telescope Array (CTA) to an annihilation signal from weakly interacting massive particles from M31 and M33. Here, we show that a 100 h long observation campaign will allow CTA to probe annihilation cross-sections up to <συ> ≈ 5•10^-25 cm³ s^-1 for the τ⁺τ^- annihilation channel (for M31, at a DM mass of 0.3 TeV), improving the current limits derived by HAWC by up to an order of magnitude. We present an estimate of the expected CTA sensitivity, by also taking into account the contributions of the astrophysical background and other possible sources of systematic uncertainty. We also show that CTA might be able to detect the extended emission from the bulge of M31, detected at lower energies by the Fermi/LAT.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1983797

Report Number(s):: FERMILAB-PUB-23-163-V; arXiv:2304.08202; oai:inspirehep.net:2651976; TRN: US2402529

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2023, Issue 08; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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