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γ-ray and ν Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential

1
Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München, Germany
2
Laboratoire Univers & Particules de Montpellier (LUPM), CNRS & Université de Montpellier (UMR-5299), Place Eugène Bataillon, F-34095 Montpellier CEDEX 05, France
3
Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 Avenue des Martyrs, 38026 Grenoble, France
*
Authors to whom correspondence should be addressed.
Galaxies 2019, 7(2), 60; https://doi.org/10.3390/galaxies7020060
Received: 25 April 2019 / Revised: 16 May 2019 / Accepted: 18 May 2019 / Published: 28 May 2019
(This article belongs to the Special Issue The Role of Halo Substructure in Gamma-Ray Dark Matter Searches)
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Abstract

The distribution of dark-matter (DM) subhalos in our galaxy remains disputed, leading to varying γ -ray and ν flux predictions from their annihilation or decay. In this work, we study how, in the inner galaxy, subhalo tidal disruption from the galactic baryonic potential impacts these signals. Based on state-of-the art modeling of this effect from numerical simulations and semi-analytical results, updated subhalo spatial distributions are derived and included in the CLUMPY code. The latter is used to produce a thousand realizations of the γ -ray and ν sky. Compared to predictions based on DM only, we conclude a decrease of the flux of the brightest subhalo by a factor of 2 to 7 for annihilating DM and no impact on decaying DM: the discovery prospects or limits subhalos can set on DM candidates are affected by the same factor. This study also provides probability density functions for the distance, mass, and angular distribution of the brightest subhalo, among which the mass may hint at its nature: it is most likely a dwarf spheroidal galaxy in the case of strong tidal effects from the baryonic potential, whereas it is lighter and possibly a dark halo for DM only or less pronounced tidal effects. View Full-Text
Keywords: dark matter; galactic subhalos; semi-analytic modeling; gamma-rays and neutrinos dark matter; galactic subhalos; semi-analytic modeling; gamma-rays and neutrinos
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hütten, M.; Stref, M.; Combet, C.; Lavalle, J.; Maurin, D. γ-ray and ν Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential. Galaxies 2019, 7, 60.

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