%0 Journal Article
%A Barrio Uña, Juan Abel
%A Contreras González, José Luis
%A Fonseca González, María Victoria
%A López Moya, Marcos
%A Miener, Tjark
%A Morcuende, D.
%A Peñil Del Campo, Pablo
%A Saha, Lab
%T Combined searches for dark matter in dwarf spheroidal galaxies observed with the MAGIC telescopes, including new data from Coma Berenices and Draco
%D 2022
%@ 2212-6864
%U https://hdl.handle.net/20.500.14352/71445
%X Milky Way dwarf spheroidal galaxies (dSphs) are among the best candidates to search for signals of dark matter annihilation with Imaging Atmospheric Cherenkov Telescopes, given their high mass-to-light ratios and the fact that they are free of astrophysical gamma-ray emitting sources. Since 2011, MAGIC has performed a multi-year observation program in search for Weakly Interacting Massive Particles (WIMPs) in dSphs. Results on the observations of Segue 1 and Ursa Major II dSphs have already been published and include some of the most stringent upper limits (ULs) on the velocity-averaged cross-section <sigma(ann) v > of WIMP annihilation from observations of dSphs. In this work, we report on the analyses of 52.1 h of data of Draco dSph and 49.5 h of Coma Berenices dSph observed with the MAGIC telescopes in 2018 and in 2019 respectively. No hint of a signal has been detected from either of these targets and new constraints on the <sigma(ann) v > of WIMP candidates have been derived. In order to improve the sensitivity of the search and reduce the effect of the systematic uncertainties due to the J-factor estimates, we have combined the data of all dSphs observed with the MAGIC telescopes. Using 354.3 h of dSphs good quality data, 95% CL ULs on <sigma(ann) v > have been obtained for 9 annihilation channels. For most of the channels, these results reach values of the order of 10(-24) cm(3)/s at( )similar to TeV and are the most stringent limits obtained with the MAGIC telescopes so far. (C) 2021 Elsevier B.V. All rights reserved.
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