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[Jann(0.5◦)/ 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 τ τ final state, where a cross section for annihilation down to ⟨σannv⟩=3.05×10−24 cm3 s−1 isexcluded.

Acciari, V.A., Ansoldi, S., Antonelli, L.A., Arbet Engels, A., Baack, D., Babić, A., et al. (2020). A search for dark matter in Triangulum II with the MAGIC telescopes. PHYSICS OF THE DARK UNIVERSE, 28, 100529 [10.1016/j.dark.2020.100529].

A search for dark matter in Triangulum II with the MAGIC telescopes

Mallamaci, M.;
2020-01-01

Abstract

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[Jann(0.5◦)/ 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 τ τ final state, where a cross section for annihilation down to ⟨σannv⟩=3.05×10−24 cm3 s−1 isexcluded.
2020
Settore FIS/01 - Fisica Sperimentale
Acciari, V.A., Ansoldi, S., Antonelli, L.A., Arbet Engels, A., Baack, D., Babić, A., et al. (2020). A search for dark matter in Triangulum II with the MAGIC telescopes. PHYSICS OF THE DARK UNIVERSE, 28, 100529 [10.1016/j.dark.2020.100529].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/640365
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