TeV Halo Study of Geminga and Monogem with HAWC

Pulsar Inverse Compton halos (TeV halos) are a new subclass of gamma-ray sources.HAWC detected the first two candidates, Geminga and Monogem.These two candidates are of great interest to the anomalous positron excess observed by PAMELA, Fermi-LAT, and AMS-02.This positron excess has been considered to originate from dark matter annihilation, but pulsars can also explain this excess.The HAWC collaboration presented their analysis of the morphology of these pulsars and derived high electron/positron emission efficiency but a diffusion coefficient lower than the average value by a factor of 2 orders of magnitude.Here we present a more in-depth study of Geminga and Monogem with 2139 days of observations from the HAWC observatory.We apply a 3D template model from diffuse-gamma ray electrons/positron emission inverse Compton interactions as they escape the pulsar.