Two-zone diffusion of e-/e+ from Geminga explains the e+ anomaly

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Presentation transcript:

Two-zone diffusion of e-/e+ from Geminga explains the e+ anomaly Kun Fang (方堃), Xiao-Jun Bi (毕效军), Peng-Fei Yin (殷鹏飞), Qiang Yuan (袁强) Speaker: Kun Fang (方堃), IHEP (高能物理所) 2018.06.22, Shanghai

Two-zone diffusion for Geminga Positron excess is confirmed by different experiments. Extra positron sources: Astrophysical sources Dark matter Q. Xiang, X. Bi, S. Lin, P. Yin 2017 DM needs very large annihilation cross, but severely constrained by Fermi and Planck observations.

Two-zone diffusion for Geminga Geminga: a plausible candidate of positron excess r = 250 pc, t = 342 kyr, W = 1.23e49 erg Observed multi-TeV halo (Milagro, HAWC) 0.3-5 keV, XMM-Newton P.A.Caraveo et al. 2003 35 TeV, Milagro A. A. Abdo et al. 2009

Two-zone diffusion for Geminga A.U. Abeysekara et al. 2017 The diffusion coefficient is hundreds times slower than that derived by B/C ! The pulsar origin of e+ is disfavored?

Two-zone diffusion for Geminga Contradiction#1 B/C anti-proton diffuse gamma-ray Trotta et al. 2011 Contradiction#2 H.E.S.S has observed 20 TeV e-/e+ The H.E.S.S Collaboration 2017

Two-zone diffusion for Geminga strong convection weak convection D. Hooper et al. 2017 Strong convection? Energy- indepenent diffusion? The distance of Geminga is 250 pc, while e-/e+ of 500 GeV can propagate 1.5 kpc with normal speed.

Two-zone diffusion for Geminga Propagation equation: Diffusion coefficient: D1 is derived by HAWC, D2 is the normal value Numerical solution is required! Operator splitting: The finite volume method is adopted for the diffusion operator (ensure flux conservation) GALPROP and DRAGON only apply to cases of smooth varying of D

Two-zone diffusion for Geminga Spatial distribution of 1 TeV e-/e+ Spectrum at the earth K. Fang, X. Bi, P. Yin, Q. Yuan 2018 Black line: fast diffusion with normal speed Red line: slow diffusion given by HAWC Other lines: two-zone diffusion with r_star=40 pc, 70 pc, 100 pc

Two-zone diffusion for Geminga Compare with AMS-02 e+ K. Fang, X. Bi, P. Yin, Q. Yuan 2018 The best-fit r_star is 50 pc The conversion efficiency from spin-down energy is 75%

Two-zone diffusion for Geminga A self-consistency check The gamma-ray emission observed by HAWC is produced by ~100 TeV e-/e+, corresponding to a cooling time of 7000 yr. K. Fang, X. Bi, P. Yin, Q. Yuan 2018 Explanation of the slow diffusion region? Pre-existed: in the region influenced by its corresponding SNR self-generated: the large gradient of CR near the source leads to the streaming instability

Two-zone diffusion for Geminga Pulsars(PWNe) are still the probable sources of e+ excess! Thank you for your attention!