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Date and Time of the Query: 2019-06-15 T13:47:47 PDT
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2015ApJS..219...37M Confronting Galactic and Extragalactic gamma-Rays Observed by Fermi-LAT with Annihilating Dark Matter in an Inert Higgs Doublet Model Prasad Modak, Kamakshya; Majumdar, Debasish Abstract. In this thorough study, we focus on the indirect detection of dark matter (DM) through the examination of unexplained galactic and extragalactic gamma-ray signatures for a low-mass DM model. For this purpose, we consider a simple Higgs-portal DM model, namely, the inert Higgs doublet model (IHDM) where the SM is extended with an additional complex SU(2)_L_ doublet scalar. The stability of the DM candidate in this model, i.e., the lightest neutral scalar component of the extra doublet, is ensured by imposing discrete {{{Z}}}_2_ symmetry. The reduced-{chi}^2^ analysis using theoretical, experimental, and observational constraints suggests that the best-fit value of DM mass in this model is ~63.5 GeV. We analyze the anomalous GeV gamma-ray excess from the Galactic Center in light of the best-fit IHDM parameters. We further check the consistency of the best-fit IHDM parameters with the Fermi Large Area Telescope (Fermi-LAT) obtained limits on photon flux for 18 Milky Way dwarf spheroidal satellite galaxies (dSphs) known to be mostly dominated by DM. Also, since the gamma-ray signal from DM annihilation is assumed to be embedded within the extragalactic gamma-ray background (EGB), the theoretical calculations of photon flux for the best-fit parameter point in the IHDM framework are compared with the Fermi-LAT results for diffuse and isotropic EGB for different extragalactic and astrophysical background parametrizations. We show that the low-mass DM in the IHDM framework can satisfactorily account for all of the observed continuum gamma-ray fluxes originating from galactic and extragalactic sources. The extensive analysis performed in this work is valid for any Higgs-portal model with DM mass comparable to that considered in this work. Key words: dark matter, galaxies: dwarf, galaxies: halos, Galaxy: center, gamma rays: diffuse background, gamma rays: galaxies
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