2026-06-26T16:35:54Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/63342024-09-05T15:43:43Zcom_20.500.14352_14col_20.500.14352_15

Barrio Uña, Juan Abel Contreras González, José Luis Fidalgo, David Friedrich Carreto Fonseca González, María Victoria Hoang, Kim Dinh López Moya, Marcos Peñil Del Campo, Pablo Saha, Lab 2023-06-16T15:19:13Z 2023-06-16T15:19:13Z 2020-05 2212-6864 10.1016/j.dark.2020.100529 https://hdl.handle.net/20.500.14352/6334 https://doi.org/10.1016/j.dark.2020.100529 https://www.sciencedirect.com/ We present the first results from very-high-energy observations of the dwarf spheroidal satellite candidate Triangulum II with the MAGIC telescopes from 62.4 h of good-quality data taken between August 2016 and August 2017. We find no gamma-ray excess in the direction of Triangulum II, and upper limits on both the differential and integral gamma-ray flux are presented. Currently, the kinematics of Triangulum II are affected by large uncertainties leading to a bias in the determination of the properties of its dark matter halo. Using a scaling relation between the annihilation J-factor and heliocentric distance of well-known dwarf spheroidal galaxies, we estimate an annihilation J-factor for Triangulum II for WIMP dark matter of log[J(ann)(0.5 degrees)/GeV2 cm(-5)] = 19.35 +/- 0.37. We also derive a dark matter density profile for the object relying on results from resolved simulations of Milky Way sized dark matter halos. We obtain 95% confidence-level limits on the thermally averaged annihilation cross section for WIMP annihilation into various Standard Model channels. The most stringent limits are obtained in the tau(-)tau(+) final state, where a cross section for annihilation down to <sigma(ann)nu > = 3.05 x 10(-24) cm(3) s(-1) is excluded. (C) 2020 Elsevier B.V. All rights reserved. eng open access A search for dark matter in Triangulum II with the MAGIC telescopes journal article