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

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

http://urn.fi/urn:nbn:fi-fe2020120499493

Teksti

Acciari, V. A. (V. A.) ; Ansoldi, S. (S.) ; Antonelli, L. A. (L. A.) ; Engels, A. A. (A. Arbet) ; Baack, D. (D.) ; Babic, A. (A.) ; Banerjee, B. (B.) ; de Almeida, U. B. (U. Barres) ; Barrio, J. A. (J. A.) ; Gonzalez, J. B. (J. Becerra) ; Bednarek, W. (W.) ; Bellizzi, L. (L.) ; Bernardini, E. (E.) ; Berti, A. (A.) ; Besenrieder, J. (J.) ; Bhattacharyya, W. (W.) ; Bigongiari, C. (C.) ; Biland, A. (A.) ; Blanch, O. (O.) ; Bonnoli, G. (G.) ; Bosnjak, Z. (Z.) ; Busetto, G. (G.) ; Carosi, R. (R.) ; Ceribella, G. (G.) ; Chai, Y. (Y.) ; Chilingarian, A. (A.) ; Cikota, S. (S.) ; Colak, S. M. (S. M.) ; Colin, U. (U.) ; Colombo, E. (E.) ; Contreras, J. L. (J. L.) ; Cortina, J. (J.) ; Covino, S. (S.) ; D'Elia, V. (V) ; da Vela, P. (P.) ; Dazzi, F. (F.) ; de Angelis, A. (A.) ; de Lotto, B. (B.) ; Delfino, M. (M.) ; Delgado, J. (J.) ; Depaoli, D. (D.) ; di Pierro, F. (F.) ; di Venere, L. (L.) ; Espineira, E. S. (E. Souto) ; Prester, D. D. (D. Dominis) ; Donini, A. (A.) ; Dorner, D. (D.) ; Doro, M. (M.) ; Elsaesser, D. (D.) ; Ramazani, V. F. (V. Fallah) ; Fattorini, A. (A.) ; Ferrara, G. (G.) ; Fidalgo, D. (D.) ; Foffano, L. (L.) ; Fonseca, M. V. (M., V) ; Font, L. (L.) ; Fruck, C. (C.) ; Fukami, S. (S.) ; Lopez, R. J. (R. J. Garcia) ; Garczarczyk, M. (M.) ; Gasparyan, S. (S.) ; Gaug, M. (M.) ; Giglietto, N. (N.) ; Giordano, F. (F.) ; Gliwny, P. (P.) ; Godinovic, N. (N.) ; Green, D. (D.) ; Green, J. G. (J. G.) ; Guberman, D. (D.) ; Hadasch, D. (D.) ; Hahn, A. (A.) ; Herrera, J. (J.) ; Hoang, J. (J.) ; Hrupec, D. (D.) ; Hutten, M. (M.) ; Inada, T. (T.) ; Inoue, S. (S.) ; Ishio, K. (K.) ; Iwamura, Y. (Y.) ; Jouvin, L. (L.) ; Kerszberg, D. (D.) ; Kubo, H. (H.) ; Kushida, J. (J.) ; Lamastra, A. (A.) ; Lelas, D. (D.) ; Leone, F. (F.) ; Lindfors, E. (E.) ; Lombardi, S. (S.) ; Longo, F. (F.) ; Lopez, M. (M.) ; Lopez-Coto, R. (R.) ; Lopez-Oramas, A. (A.) ; Loporchio, S. (S.) ; de Oliveira Fraga, B. M. (B. Machado) ; Maggio, C. (C.) ; Majumdar, P. (P.) ; Makariev, M. (M.) ; Mallamaci, M. (M.) ; Maneva, G. (G.) ; Manganaro, M. (M.) ; Mannheim, K. (K.) ; Maraschi, L. (L.) ; Mariotti, M. (M.) ; Martinez, M. (M.) ; Munar-Adrover, P. (P.) ; Neustroe, V. (V) ; Nigro, C. (C.) ; Nilsson, K. (K.) ; Ninci, D. (D.) ; Nishijima, K. (K.) ; Noda, K. (K.) ; Nogues, L. (L.) ; Nozaki, S. (S.) ; Paiano, S. (S.) ; Palacio, J. (J.) ; Palatiello, M. (M.) ; Paneque, D. (D.) ; Paoletti, R. (R.) ; Paredes, J. M. (J. M.) ; Penil, P. (P.) ; Peresano, M. (M.) ; Persic, M. (M.) ; Moroni, P. G. (P. G. Prada) ; Puljak, I. (I) ; Rhode, W. (W.) ; Ribo, M. (M.) ; Rico, J. (J.) ; Righi, C. (C.) ; Rugliancich, A. (A.) ; Saha, L. (L.) ; Sahakyan, N. (N.) ; Saito, T. (T.) ; Sakurai, S. (S.) ; Satalecka, K. (K.) ; Saturni, F. G. (F. G.) ; Schmidt, K. (K.) ; Schweizer, T. (T.) ; Sitarek, J. (J.) ; Snidaric, I. (I) ; Sobczynska, D. (D.) ; Somero, A. (A.) ; Stamerra, A. (A.) ; Strom, D. (D.) ; Suda, Y. (Y.) ; Suric, T. (T.) ; Takahashi, M. (M.) ; Tavecchio, F. (F.) ; Temnikov, P. (P.) ; Terzic, T. (T.) ; Teshima, M. (M.) ; Torres-Alba, N. (N.) ; Tosti, L. (L.) ; Vagelli, V. (V.) ; van Scherpenberg, J. (J.) ; Vanzo, G. (G.) ; Acosta, M. V. (M. Vazquez) ; Vigorito, C. F. (C. F.) ; Vitale, V. (V.) ; Vovk, I. (I) ; Will, M. (M.) ; Zaric, D. (D.)

Elsevier

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 is excluded.

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