Publication: SKA-Phase 1 sensitivity to synchrotron radio emission from multi-TeV Dark Matter candidates.
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2020-01
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Elsevier B.V.
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Abstract
In the era of radio astronomy, the high sensitivity of the Square Kilometre Array (SKA) could play a decisive role in the detection of new radio sources. In this work, we study the SKA sensitivity to the synchrotron radio emission expected by the annihilation of TeV DM candidate in the Draco dwarf spheroidal galaxy. On the one hand, we consider model-independent DM candidates: we find out that with 1000 h of data-taking, SKA1-MID will be able to exclude up to 10 TeV thermal DM candidates that annihilate in W+W- and b (b) over bar channels. We also study as these constraints improve by including a density enhancement due to a DM-spike associated with an intermediate-mass black hole in Draco. On the other hand, we consider extra-dimensional brane-world DM candidates, dubbed branons. In this specific scenario, SKA allows us to set constraints on the branon parameter space (f, M), where f is related to the coupling of the branon to the Standard Model particles and M is the mass of the branon itself. In particular, we consider two different branon DM candidates. We find out that SKA will be able to set more stringent constraints on the branon DM candidate required in order to fit the AMS-02 data, yet the sensitivity of the instrument should be improved in order to study the branon candidate for the Galactic Centre. Nonetheless, we show that SKA represents - among other detectors - the most promising instrument for multi-wavelength detection of synchrotron radio emission by annihilating multi-TeV DM. (C) 2019 Elsevier B.V. All rights reserved.
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© 2020 Elsevier B.V.
This work was partly supported by the projects FIS2014-52837-P (Spanish MINECO) and FIS2016-78859-P (AEI/FEDER, UE). AdlCD acknowledges financial support from projects FPA2 014-53375-C2-1-P Spanish Ministry of Economy and Science, CA15117 CANTATA and CA16104 COST Actions EU Framework Programme Horizon 2020, CSIC I-LINK1019 Project, Spanish Ministry of Economy and Science, University of Cape Town Launching Grants Programme and National Research Foundation grants 99077 2016-2018 (Ref. No. CSUR150628121624), 110966 Ref. No. BS1705-09230233 and the NRF Incentive Funding for Rated Researchers, Ref. No. IFR170131220846. AdlCD would like to thank the Abdus Salam International Centre for Theoretical Physics (ICTP, Trieste) for its hospitality in the latest stages of the manuscript. VG's contribution to this work has been supported by Juan de la Cierva-Formacion FJCI-2016-29213 grant, the Spanish Agencia Estatal de Investigacion through the grants FPA2015-65929-P (MINECO/FEDER, UE) and IFT Centro de Excelencia Severo Ochoa SEV-2016-0597, INFN project QGSKY, the Agencia Estatal de Investigacion (AEI) and partially by the H2020 CSA Twinning project No. 692194 ORBI-T-WINNINGO. VG thanks S. Camera, D. Gaggero, P. Ullio and the DAMASCO group for useful discussions and also acknowledges the support of the Spanish Red Consolider MultiDark FPA2017-90566-REDC. MMI would like to thank the SKA Pathfinder HI Survey Coordination Committee and the FAST-SKA Pathfinders Synergies meeting organising committee, specially to C. Carignan for its hospitality in first stages of the manuscript. MMI thanks G. Beck, S. Blyth, J. Delhaize, M. Regis, H. Villarubia Rojo and S. White for useful discussions and acknowledges financial support from the University of Cape Town Doctoral Fellowships and the National Astrophysics and Space Science Programme (NASSP).