A search for dark matter in Triangulum II with the MAGIC telescopes. (arXiv:2003.05260v1 [astro-ph.HE])

A search for dark matter in Triangulum II with the MAGIC telescopes. (arXiv:2003.05260v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Collaboration_MAGIC/0/1/0/all/0/1">MAGIC Collaboration</a>: <a href="http://arxiv.org/find/astro-ph/1/au:+Acciari_V/0/1/0/all/0/1">V. A. Acciari</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Ansoldi_S/0/1/0/all/0/1">S. Ansoldi</a> (2,23), <a href="http://arxiv.org/find/astro-ph/1/au:+Antonelli_L/0/1/0/all/0/1">L. A. Antonelli</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Engels_A/0/1/0/all/0/1">A. Arbet Engels</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Baack_D/0/1/0/all/0/1">D. Baack</a> (5), <a href="http://arxiv.org/find/astro-ph/1/au:+Babic_A/0/1/0/all/0/1">A. Babić</a> (6), <a href="http://arxiv.org/find/astro-ph/1/au:+Banerjee_B/0/1/0/all/0/1">B. Banerjee</a> (7), <a href="http://arxiv.org/find/astro-ph/1/au:+Almeida_U/0/1/0/all/0/1">U. Barres de Almeida</a> (8), <a href="http://arxiv.org/find/astro-ph/1/au:+Barrio_J/0/1/0/all/0/1">J. A. Barrio</a> (9), <a href="http://arxiv.org/find/astro-ph/1/au:+Gonzalez_J/0/1/0/all/0/1">J. Becerra González</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Bednarek_W/0/1/0/all/0/1">W. Bednarek</a> (10), <a href="http://arxiv.org/find/astro-ph/1/au:+Bellizzi_L/0/1/0/all/0/1">L. Bellizzi</a> (11), <a href="http://arxiv.org/find/astro-ph/1/au:+Bernardini_E/0/1/0/all/0/1">E. Bernardini</a> (12,16), <a href="http://arxiv.org/find/astro-ph/1/au:+Berti_A/0/1/0/all/0/1">A. Berti</a> (13), <a href="http://arxiv.org/find/astro-ph/1/au:+Besenrieder_J/0/1/0/all/0/1">J. Besenrieder</a> (14), <a href="http://arxiv.org/find/astro-ph/1/au:+Bhattacharyya_W/0/1/0/all/0/1">W. Bhattacharyya</a> (12), <a href="http://arxiv.org/find/astro-ph/1/au:+Bigongiari_C/0/1/0/all/0/1">C. Bigongiari</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Biland_A/0/1/0/all/0/1">A. Biland</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Blanch_O/0/1/0/all/0/1">O. Blanch</a> (15), <a href="http://arxiv.org/find/astro-ph/1/au:+Bonnoli_G/0/1/0/all/0/1">G. Bonnoli</a> (11), <a href="http://arxiv.org/find/astro-ph/1/au:+Bosnjak_Z/0/1/0/all/0/1">Ž. Bošnjak</a> (6), <a href="http://arxiv.org/find/astro-ph/1/au:+Busetto_G/0/1/0/all/0/1">G. Busetto</a> (16), <a href="http://arxiv.org/find/astro-ph/1/au:+Carosi_R/0/1/0/all/0/1">R. Carosi</a> (17), <a href="http://arxiv.org/find/astro-ph/1/au:+Ceribella_G/0/1/0/all/0/1">G. Ceribella</a> (14), <a href="http://arxiv.org/find/astro-ph/1/au:+Chai_Y/0/1/0/all/0/1">Y. Chai</a> (14), <a href="http://arxiv.org/find/astro-ph/1/au:+Chilingarian_A/0/1/0/all/0/1">A. Chilingarian</a> (18), <a href="http://arxiv.org/find/astro-ph/1/au:+Cikota_S/0/1/0/all/0/1">S. Cikota</a> (6), <a href="http://arxiv.org/find/astro-ph/1/au:+Colak_S/0/1/0/all/0/1">S. M. Colak</a> (15), <a href="http://arxiv.org/find/astro-ph/1/au:+Colin_U/0/1/0/all/0/1">U. Colin</a> (14), <a href="http://arxiv.org/find/astro-ph/1/au:+Colombo_E/0/1/0/all/0/1">E. Colombo</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Contreras_J/0/1/0/all/0/1">J. L. Contreras</a> (9), <a href="http://arxiv.org/find/astro-ph/1/au:+Cortina_J/0/1/0/all/0/1">J. Cortina</a> (19), <a href="http://arxiv.org/find/astro-ph/1/au:+Covino_S/0/1/0/all/0/1">S. Covino</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+DElia_V/0/1/0/all/0/1">V. D'Elia</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Vela_P/0/1/0/all/0/1">P. Da Vela</a> (17), <a href="http://arxiv.org/find/astro-ph/1/au:+Dazzi_F/0/1/0/all/0/1">F. Dazzi</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Angelis_A/0/1/0/all/0/1">A. De Angelis</a> (16), <a href="http://arxiv.org/find/astro-ph/1/au:+Lotto_B/0/1/0/all/0/1">B. De Lotto</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Delfino_M/0/1/0/all/0/1">M. Delfino</a> (15,26), <a href="http://arxiv.org/find/astro-ph/1/au:+Delgado_J/0/1/0/all/0/1">J. Delgado</a> (15,26), <a href="http://arxiv.org/find/astro-ph/1/au:+Depaoli_D/0/1/0/all/0/1">D. Depaoli</a> (13), <a href="http://arxiv.org/find/astro-ph/1/au:+Pierro_F/0/1/0/all/0/1">F. Di Pierro</a> (13), et al. (132 additional authors not shown)

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 hours 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 $log[J_{text{ann}}({0.5^{circ}})/$
GeV$^{2}$ cm$^{-5}] = 19.35 pm 0.37$. 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
$langle sigma_{text{ann}} v rangle = 3.05 times 10^{-24}$ cm$^{3}$
s$^{-1}$ is excluded.

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