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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2020

Galactic halo size in the light of recent AMS-02 data

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Context. The vertical diffusive halo size of the Galaxy, L, is a key parameter for dark matter indirect searches. It can be better determined thanks to recent AMS-02 data.Aims. We set constraints on L from Be/B and 10Be/Be data, and we performed a consistency check with positron data. We detail the dependence of Be/B and 10Be/Be on L and forecast on which energy range better data would be helpful for future L improvements.Methods. We used USINE V3.5 for the propagation of nuclei, and e+ were calculated with the pinching method.Results. The current AMS-02 Be/B (∼3% precision) and ACE-CRIS 10Be/Be (∼10% precision) data bring similar and consistent constraints on L. The AMS-02 Be/B data alone constrain L = 5−2+3 kpc at a 68% confidence level (spanning different benchmark transport configurations), a range for which most models do not overproduce positrons. Future experiments need to deliver percent-level accuracy on 10Be/9Be anywhere below 10 GV to further constrain L.Conclusions. Forthcoming AMS-02, HELIX, and PAMELA 10Be/9Be results will further test and possibly tighten the limits derived here. Elemental ratios involving radioactive species with different lifetimes (e.g. Al/Mg and Cl/Ar) are also awaited to provide complementary and robuster constraints.
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hal-02895623 , version 1 (09-07-2020)

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N. Weinrich, M. Boudaud, L. Derome, Y. Génolini, Julien Lavalle, et al.. Galactic halo size in the light of recent AMS-02 data. Astronomy and Astrophysics - A&A, 2020, 639, pp.A74. ⟨10.1051/0004-6361/202038064⟩. ⟨hal-02895623⟩
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