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Título:
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A search for dark matter in Triangulum II with the MAGIC telescopes
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Autores:
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Barrio Uña, Juan Abel ;
Contreras González, José Luis ;
Fidalgo, David Friedrich Carreto ;
Fonseca González, Mª Victoria ;
Hoang, Kim Dinh ;
López Moya, Marcos ;
Peñil del Campo, Pablo ;
Saha, Lab ;
otros, ...
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Tipo de documento:
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texto impreso
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Editorial:
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Elsevier B.V., 2020-05
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física nuclear
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Tipo = Artículo
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Resumen:
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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 = 3.05 x 10(-24) cm(3) s(-1) is excluded. (C) 2020 Elsevier B.V. All rights reserved.
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En línea:
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https://eprints.ucm.es/id/eprint/60975/1/FonsecaG10preprint.pdf
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