Galactic halo size in the light of recent AMS-02 data
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Galactic halo size in the light of recent AMS-02 data. / Weinrich, N.; Boudaud, M.; Derome, L.; Genolini, Y.; Lavalle, J.; Maurin, D.; Salati, P.; Serpico, P.; Weymann-Despres, G.
In: Astronomy & Astrophysics, Vol. 639, A74, 09.07.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Galactic halo size in the light of recent AMS-02 data
AU - Weinrich, N.
AU - Boudaud, M.
AU - Derome, L.
AU - Genolini, Y.
AU - Lavalle, J.
AU - Maurin, D.
AU - Salati, P.
AU - Serpico, P.
AU - Weymann-Despres, G.
PY - 2020/7/9
Y1 - 2020/7/9
N2 - 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 Be-10/Be data, and we performed a consistency check with positron data. We detail the dependence of Be/B and Be-10/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 (similar to 3% precision) and ACE-CRIS Be-10/Be (similar to 10% precision) data bring similar and consistent constraints on L. The AMS-02 Be/B data alone constrainL = 5(-2)(+3)L =5- 2+ 3kpc 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 Be-10/Be-9 anywhere below 10 GV to further constrain L.Conclusions. Forthcoming AMS-02, HELIX, and PAMELA Be-10/Be-9 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.
AB - 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 Be-10/Be data, and we performed a consistency check with positron data. We detail the dependence of Be/B and Be-10/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 (similar to 3% precision) and ACE-CRIS Be-10/Be (similar to 10% precision) data bring similar and consistent constraints on L. The AMS-02 Be/B data alone constrainL = 5(-2)(+3)L =5- 2+ 3kpc 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 Be-10/Be-9 anywhere below 10 GV to further constrain L.Conclusions. Forthcoming AMS-02, HELIX, and PAMELA Be-10/Be-9 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.
KW - astroparticle physics
KW - cosmic rays
KW - Galaxy: halo
KW - COSMIC-RAY PROPAGATION
KW - IN-DIFFUSION MODELS
KW - ISOTOPIC COMPOSITION
KW - SOLAR MODULATION
KW - NEUTRON MONITORS
KW - SPATIAL ORIGIN
KW - MUON DETECTORS
KW - POSITRON FLUX
KW - ABUNDANCE
KW - GAMMA
U2 - 10.1051/0004-6361/202038064
DO - 10.1051/0004-6361/202038064
M3 - Journal article
VL - 639
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A74
ER -
ID: 246350507